| UNITED      STATES                      |
|-----------------------------------------|
| SECURITIES      AND EXCHANGE COMMISSION |
| Washington,      D.C.  20549  |
| FORM      10-K                          |

| (MARK      ONE)                                            |
|------------------------------------------------------------|
| (x)                                                        | Annual      Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of      1934 (Fee Required)For      the fiscal year ended March 28, 2009 |
| or                                                         |
| (  )                                             | Transition      Report Pursuant to Section 13 or 15(d) of the Securities and Exchange Act      of 1934For      the transition period from _______ to ________ |
|  Commission      File No. 0-12718                     |
|                                                       |
| SUPERTEX,      INC.                                        |
| (Exact      name of Registrant as specified in itscharter) |

| California                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 94-2328535                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------|
| (State      or other jurisdiction of incorporation or organization)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | (I.R.S.      Employer Identification No.)                                        |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 1235      Bordeaux Drive, Sunnyvale, California 94089                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| (Address      of principal executive offices)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Registrant's      Telephone Number, Including Area Code:  (408)      222-8888                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                             |
| Securities      registered pursuant to Section 12(b) of the Act:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Title      of each class: Common Stock                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Name      of each exchange on which registered: NASDAQ Global Select      Market |
| Securities      registered pursuant to Section 12(g) of the Act: None                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Indicate      by check mark if the registrant is a well-known seasoned issuer, as      defined in Rule 405 of the Securities Act.  Yes  o   No  x                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Indicate      by check mark if the registrant is not required to file reports pursuant      to Section 13 of Section 15(d) of the Act. Yes  o   No  x                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Indicate      by check mark whether the Registrant (1) has filed all reports required to      be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934      during the preceding 12 months (or for such shorter period that the      Registrant was required to file such reports), and (2) has been subject to      such filing requirements for the past 90 days. Yes  x   No  o                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Indicate      by check mark whether the registrant has submitted electronically and      posted on its corporate Website, if any, every Interactive Data File      required to be submitted and posted pursuant to Rule 405 of Regulation S-T      (§229.405 of this chapter) during the preceeding 12 months (or for shorter      period that the registrant was required to submit and post such files).      Yes x No      o                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Indicate      by check mark if disclosure of delinquent filers pursuant to Item 405 of      Regulation S-K (Sec. 229.405 of this chapter) is not contained herein, and      will not be contained, to the best of registrant’s knowledge, in      definitive proxy or information statements incorporated by reference in      Part III of this Form 10-K or any amendment to this Form 10-K. o                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Indicate      by check mark whether the registrant is an accelerated filer (as defined      in Rule 12b-2 of the Act). Check one.    Large      accelerated filer o          Accelerated      filer  x            Non-accelerated      filer o            Smaller      Reporting Company o                                                                                                                                                                                                                                                                                                                                                                            |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| As      of September 26, 2008, the last business day of the registrant’s most      recently completed second fiscal quarter, there were 12,845,656 shares of      the registrant’s common stock outstanding, and the aggregate market value      of such shares held by non-affiliates of the registrant was $324,744,251      based on the closing price reported on the NASDAQ National Market on      September 26, 2008. Shares of common stock held by officers, directors and      other persons who may be deemed “affiliates” of the Registrant have been      excluded from this computation.  This determination of affiliate      status is not necessarily a conclusive determination for other purposes.      The total number of shares outstanding of the Registrant's common stock as      of May 26, 2009, was 12,887,639. |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Indicate      by check mark whether the registrant is a shell company (as defined in      Rule 12b-2 of the Act). Yes  o    No      x                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Documents Incorporated by      Reference:  Part III incorporates by reference portions      of the Company's definitive proxy statement for the Annual Meeting of      Shareholders to be held on August 14, 2009 (the "Proxy      Statement").                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Exhibit      Index is on Page 68                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Total      number of pages is 75                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |

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SUPERTEX, INC.

|       |   |   | PART      I                                                                                                            |   |   |
|------------|--------|--------|------------------------------------------------------------------------------------------------------------------------|--------|--------|
|       |   |   |                                                                                                                   |   | Page   |
| Item       | 1.     |   | Business                                                                                                               |   | 1      |
| Item       | 1A.    |   | Risk Factors                                                                                                           |   | 10     |
| Item       | 1B.    |   | Unresolved Staff Comments                                                                                              |   | 13     |
| Item       | 2.     |   | Properties                                                                                                             |   | 13     |
| Item       | 3.     |   | Legal Proceedings                                                                                                      |   | 13     |
| Item       | 4.     |   | Submission of Matters to a Vote of Security      Holders                                                               |   | 13     |
|       |   |   |                                                                                                                   |   |   |
|       |   |   |                                                                                                                   |   |   |
|       |   |   | PART      II                                                                                                           |   |   |
|       |   |   |                                                                                                                   |   |   |
| Item       | 5.     |   | Market for Registrant's Common Equity,      Related Shareholder Matters and Issuer Purchases of Equity      Securities |   | 14     |
| Item       | 6.     |   | Selected Financial Data                                                                                                |   | 16     |
| Item       | 7.     |   | Management's Discussion and Analysis of Financial Condition      and Results of Operations                             |   | 17     |
| Item       | 7A.    |   | Quantitative and Qualitative      Disclosures about Market Risk                                                        |   | 33     |
| Item       | 8.     |   | Financial Statements and Supplementary Data                                                                            |   | 34     |
| Item       | 9.     |   | Changes in and Disagreements with Accountants on      Accounting and Financial Disclosure                              |   | 35     |
| Item       | 9A.    |   | Controls and Procedures                                                                                                |   | 35     |
| Item       | 9B.    |   | Other Information                                                                                                      |   | 36     |
|       |   |   |                                                                                                                   |   |   |
|       |   |   |                                                                                                                   |   |   |
|       |   |   | PART      III                                                                                                          |   |   |
|       |   |   |                                                                                                                   |   |   |
| Item       | 10.    |   | Directors, Executive Officers, and      Corporate Governance                                                           |   | 36     |
| Item       | 11.    |   | Executive Compensation                                                                                                 |   | 36     |
| Item       | 12.    |   | Security Ownership of Certain Beneficial      Owners and Management and Related Stockholder Matters                    |   | 37     |
| Item       | 13.    |   | Certain Relationships and Related      Transactions, and Director Independence                                         |   | 37     |
| Item       | 14.    |   | Principal Accountant Fees and Services                                                                                 |   | 37     |
|       |   |   |                                                                                                                   |   |   |
|       |   |   |                                                                                                                   |   |   |
|       |   |   | PART      IV                                                                                                           |   |   |
|       |   |   |                                                                                                                   |   |   |
| Item       | 15.    |   | Exhibits and Financial Statement Schedules                                                                             |   | 38     |
|       |   |   |                                                                                                                   |   |   |
| Signatures |   |   | 40                                                                                                                     |

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PART I

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| Markets,      Products and Strategies  |
|---------------------------------------------|
| Focus      Markets                          | Submarket | Products | Strategies |
| MedicalElectronics                          | Ultrasound      Imaging Processing      services | 3rd      Gen. MUX, HV Pulsers, Beam Former, FET DriversCustom      Processing Services | Custom      and proprietary, LeadershipOpportunistic      business with industry leaders |
|                                        |   |   |   |
| LED      Drivers                            | LED      Lighting | RGB      and White Backlighting for LCD TVs, Displays and Monitors, and Notebook      screens; Street Lights and Traffic Signals; Commercial Signage and      Advertising Displays;Automotive      Lighting; and General Illumination | Leadership,      efficient, and cost-effective high voltage solutions  |
|                                        |   |   |   |
| Imaging                                     | Backlighting      keypads & displays | EL      Drivers | Multi-segments,Proprietary,      Leadership |
|                                        | Printers Processing      Services | HV      Drivers for Non-impactInk      Jet PrintersCustom      Processing Services | Custom      and proprietary,LeadershipOpportunistic      business with industry leaders |
|                                        |   |   |   |
| Telecom                                     | Telecommunication | HV      Ring Generators, Optical MEMS Drivers, HV Switches, HV line protection      devices | Custom      and proprietary,Leadership |
| Data      communication                     | Power      Mgmt/Supervisory, Power Sequencers | Proprietary |
|                                        |   |   |   |
| Industrial/Other                            | Various      Custom Products and Processing Services | Proprietary      custom HV ICs Custom      Processing Services | Custom      and proprietaryOpportunistic      business with industry leaders |

| ·   | The      Medical Electronics      Market |
|--------------------|------------------------------------------|

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| ·   | The LED Drivers      Market |
|--------------------|-----------------------------|

| ·   | The      Imaging      Market |
|--------------------|------------------------------|

| (1)   | A      family of products for driving EL panels to back-light liquid crystal      displays (“LCD”) in hand-held instruments, such as watches, monochrome      screens and to backlight keypads for cell phones, PDAs, pagers, and MP3      players. Supertex is one of the key providers of EL drivers for cell      phones, PDAs, and watches, and we have a significant share of this market      due in no small part to the introduction of several inductorless EL driver      ICs, ideally suited for use in space-constrained applications. Our      strategy is to expand the number of channels from one or two to sixteen      for lighting the displays of devices that will challenge existing smart      phones. |
|-----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (2)   | Driver      ICs for driving non-impact printers and plotters, primarily using inkjet      technologies. The printer product family is used in ink-jet and      electrostatic types of printers and plotters that are mostly high-end      products with full glossy color capability, high resolution and high-speed      output. |
|-----------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | The      Telecommunications      (“Telecom”)/Data Communication (“Datacom”)  Market |
|--------------------|-------------------------------------------------------------------------------------------------------------|

|        (1)   | Telecom,      which includes interface products used in telephone handsets, solid-state      relays, modems, fax, ISDN, networking, PABX, and PCMCIA cards, as well as      diagnostic, curbside, set-top and central office equipment.  |
|------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|        (2)   | Datacom,      which includes hotswap and sequencer controller, power management, ring      generators, high voltage protection & isolated switches, and optical      Micro-Electro-Mechanical System (“MEMS”) driver ICs.  In      addition, we offer custom processing services for certain optical and      ultrasound MEMS products. |
|-----------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| ·   | The Industrial/Other      Market |
|--------------------|----------------------------------|

| Market                              |   | Number      of Products in Development                                           |   | Percentage                                                                   |
|-------------------------------------|--------|----------------------------------------------------------------------------------|--------|------------------------------------------------------------------------------|
| Medical      Electronics/Ultrasound |   |              27 |   |             52%  |
| LED      Drivers                    |   |             17       |   |             33%  |
| Other                               |   |              8  |   |             15%  |
| Total                               |   |              52 |   |             100% |

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| Name                     |   | Position      with the Company                           |   | Age    |   | Officer      Since |
|--------------------------|--------|----------------------------------------------------------|--------|--------|--------|--------------------|
|                     |   |                                                     |   |   |   |               |
| Henry      C. Pao        |   | President      and Chief Executive Officer               |   | 71     |   | 1976               |
| Benedict      C. K. Choy |   | Senior      Vice President, Technology Development       |   | 63     |   | 1976               |
| William      P. Ingram   |   | Vice      President, Wafer Fab Operations                |   | 61     |   | 1999               |
| Michael      Lee         |   | Vice      President, I.C. Design                         |   | 54     |   | 1999               |
| William      Petersen    |   | Vice      President, Worldwide Sales                     |   | 56     |   | 2001               |
| Ahmed      Masood        |   | Vice      President, Marketing                           |   | 48     |   | 2006               |
| Michael      Tsang       |   | Vice      President, Standard Products                   |   | 50     |   | 2006               |
| Phillip      A. Kagel    |   | Vice      President, Finance and Chief Financial Officer |   | 59     |   | 2006               |

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Item 1A.  Risk Factors

| · | The      semiconductor industry is historically cyclical and subject to significant      volatility. Recently the severe global economic downturn has caused      substantial reduction in demand for our products, thereby adversely      affecting our financial results. We are subject to continued fluctuations      which could affect future revenues, profit and cash. Many factors affect      demand for our products, including credit availability, rising interest      rates, consumer spending pricing levels, and costs of materials. There can      be no assurance that if the global economy recovers that our sales will      increase commensurately. |
|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | We      have focused our product offerings primarily on niche markets which      leverage our capabilities and in which we believe we have dominance      because we are a technology enabler for our customers.  We      attempt to choose markets which are sizable enough to be worth pursuing      but which are not large enough to attract fierce      competition.  These markets could grow sufficiently to attract      increased competition or else competitors could enter due to happenstance      or downturns elsewhere.  One of our emerging markets is driver      ICs for LED lighting and backlighting, which has begun to grow and is      expected to become a large market during the next few years and is certain      to attract severe competition. In addition, our niche markets might be      more susceptible to shrinkage than more diverse markets due to their      concentration on a few productofferings. |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| · | We      work with our customers to develop products that they will design into      their systems.  Even if we do achieve a design win, the      customer’s system may never go into production or the production may be      smaller than we had anticipated.  Although we attempt to develop      products which will be useful for multiple customers, we may misjudge the      market and develop a product which maybe useful for only a very few      customers. |
|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | A      significant portion of our sales are from a small number of customers and      the loss of the one of these customers or failure to collect a receivable      from them could adversely affect our operations and financial position. We      do not have a long-term distributorship agreement with any of our      distributors. Normal terms and conditions of sale apply, which include a      60-day notice of cancellation and charges for work-in-process for      cancellations less than 60 days from shipment.  While we have      maintained a good relationship with our significant customers and      distributors, deterioration in that relationship could materially and      adversely affect our business and financial results. We estimate that      the combined sales to General Electric Company accounted for a total of      13% of our net sales for the fiscal year ended March 28,    2009. |
|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | We      have several competitors that are substantially larger and could bring to      bear substantially more resources than we have in our niche      markets.  We have been able to maintain profitable margins in      part because of our dominance in most of our niche      markets.  Increased competition could cause our margins to      decrease. |
|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | We      sell a substantial amount of our products internationally. International      sales represent 63%, 63% and 70% and of net sales, for fiscal years 2009,      2008 and 2007, respectively.  We expect our international sales      to continue to account for a significant portion of our total      sales.  We also package and test most of our products      abroad.  Problems with foreign economies, political turmoil,      wars, epidemics, fluctuations in currency exchange rate, increased freight      costs, interruptions in air transportation, and generally longer      receivable collection period could disrupt our business and increase our      operating expenses. |
|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | Our      gross margins may fluctuate depending on many factors, including but not      limited to, our product mix, competitive pricing dynamics, product yields,      various manufacturing costs, plant utilization, provisions for excess and      obsolete inventory, absorption of manufacturing overhead, product      warrantees, and returns andallowances. |
|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | We      are dependent upon one fab which we own and operate.  Were this      fab to become unable to meet our needs for causes such as, obsolescence      due to process technology changes, our ability to produce our products      would be adversely affected.  In addition, we could encounter      difficulties in operating our fab after an earthquake or any natural      disaster. |
|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | Our      operations may be interrupted and our business would be harmed in the      event of an earthquake, terrorist act, and other disasters.  Our      principal executive offices, our fab facility, and major suppliers are      located in areas that have been subject to severe      earthquakes.  In the event of an earthquake, we and/or our major      suppliers may be temporarily unable to continue operations and may suffer      significant property damage.  Any such interruption in our      ability or that of our major suppliers to continue operations at our      facilities could delay the development and shipment of our      products.  Like other U.S. companies, our business and operating      results are subject to uncertainties arising out of the economic      consequences of current and potential military actions or additional      terrorist activities and associated political instability, and the impact      of heightened security concerns on domestic and international travel and      commerce.  Such uncertainties could also lead to delays or      cancellations of customer orders, a general decrease in corporate spending      or our inability to effectively market and sell our      products.  Any of these results could substantially harm our      business and results of operations, causing a decrease in our      revenues. |
|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | We      are dependent upon continued innovation by our engineers.  The      competition for engineers with relevant experience is extremely intense in      the Silicon Valley, where most of our engineers are located.  We      must compete in terms of salary, benefits, and working conditions with      many start-ups which can offer more equity incentives. We established an      IC Design Center in Hong Kong in fiscal 2001 where competition for      qualified engineers is not as intense as that in Silicon      Valley.  However, a majority of our process technology and      product innovation activities remains in our Sunnyvale and San Jose      offices. |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | Our      success depends upon our ability to protect our intellectual property,      including patents, trade secrets, and know-how, and to continue our      technological innovation. We cannot assure that the steps we have taken to      protect our intellectual property will be adequate to prevent      misappropriation or that others will not develop competitive technologies      or products.  The failure to obtain necessary licenses or other      rights could cause us to lose market share and harm our      business. |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| ·   | We      are dependent upon the continued service of several of our key management      and technical personnel.  The loss of the services of one or      more of our engineers, executive officers and other key personnel or our      inability to recruit replacements for, or to attract, retain and motivate      these individuals would be harmful to our business.  We do not      have long-term employment contracts with our  employees. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | We      operate a fab in San Jose, California at which we use various chemicals      and solvents that are regulated by various environmental      agencies.  We cooperate and work with these agencies to comply      with these regulations.  Should we nonetheless inadvertently      contaminate the soil or ground water, or should the previous operator of      the fab have done so, we may be responsible for significant costs to      remediate the situation. |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Failure      to comply with present or future laws, rules and regulations of any kind      that govern our business could result in suspension of all or a portion of      production, cessation of all or a portion of operations, or the imposition      of significant administrative, civil, or criminal penalties, any of which      could harm our business. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | A      director of and the President and CEO of the Company, Henry Pao, along      with his brother, Frank Pao, and the estate of their late father, Yunni      Pao, collectively own approximately 14% of our outstanding      stock.  They have no agreement among themselves to act together      with respect to the Company or their stockholdings.  However,      were they to act in concert, they would be our largest beneficial      shareholder and may have the ability to elect one or more directors, to      direct management, and to delay or prevent a change in      control. |
|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | We      are subject to taxation by domestic and foreign taxing      authorities.  Our business is subject to the application of      multiple, and sometimes, conflicting tax laws and      regulations.  The application of tax laws is subject to legal      and factual interpretation, judgment and uncertainty, and tax laws      themselves are subject to change.  Consequently, taxing      authorities from various jurisdictions may impose tax assessments or      judgments against us that could result in a significant change to earnings      related to prior periods, and or an increase in our effective income tax      rate.    |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| · | The      Sarbanes-Oxley Act of 2002 required us to change or supplement some of our      corporate governance and securities disclosure and compliance practices.      The SEC and NASDAQ have revised, and continue to revise their regulations      and listing standards. These developments have increased, and may continue      to increase, our legal compliance and financial reporting costs. These      developments also may make it more difficult and more expensive for us to      obtain director and officer liability insurance, and we may be required to      accept reduced coverage or incur substantially higher costs to obtain      coverage. This, in turn, could make it more difficult for us to attract      and retain qualified members of our board of directors, or qualified      executive officers. |
|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | We      invest our excess cash in marketable securities consisting primarily of      auction rate securities (“ARS”), municipal bonds, and money market funds.      As of the end of fiscal year 2009, the ARS we owned had a par value of      $88,450,000. Since the fourth fiscal quarter of 2008, the ARS market has      experienced failures. The funds associated with securities that      experienced failed auctions will not be accessible until a successful      auction occurs, a buyer is found outside of the auction process, or the      underlying securities have matured or are recalled by the issuer. Given      the recent disruptions in the credit markets and the fact that the      liquidity for these types of securities remains uncertain, as of March 28,      2009 we classified the majority of our ARS as long-term assets in our      Consolidated Balance Sheet, as our ability to liquidate such securities in      the next 12 months is uncertain. We have also recorded an $8,904,000      temporary decline in fair value for these investments, which in accordance      with SFAS 115, “Accounting for Certain      Investments in Debt and Equity Securities”, has been recorded in      Other Comprehensive Loss. We believe that we will be able to recover these      securities at par value in a future period, as they are AAA or Aaa rated      and, are guaranteed by the United States Department of Education. However,      there is no assurance that we will be able to settle these bonds and      recover the cash, nor if we do recover the cash, when this may occur. We      may have to incur further impairment if the auctions of our securities      continue to fail. If the fair value of these investments declines      permanently or is other-than temporarily impaired, we would be required to      take an impairment charge which would flow through our income statement as      an expense and could cause us to incur a loss for the relevant fiscal      period. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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| · | Changes      in stock option accounting rules were adopted at the start of our fiscal      2007, which increased our compensation expense and resulted in lower      reported operating results prepared in accordance with generally accepted      accounting principles. The additional expenses resulting from this      pronouncement (SFAS 123R) may negatively impact our future stock price if      we continue to utilize broad based employee stock plans to attract and      retain employees or else, if we cease doing so, could result in a      competitive disadvantage to us in the employee  marketplace. |
|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Our      stock price is subject to wide fluctuations from many factors such as      changing financial market conditions, variations in our quarterly      operating results, changes in estimates and recommendations by securities      analysts, hedging of our stock and other transactions by      investors. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

Item 1B.  Unresolved StaffComments

Item 2.  Properties

Item 3.  Legal Proceedings

Item 4.  Submission of Matters to a Vote ofSecurity Holders

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Item 5. 

|                                     |   | Mar-04 |   |   | Mar-05 |   |   | Mar-06 |   |   | Mar-07 |   |   | Mar-08 |   |   | Mar-09 |   |
|------------------------------------------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
| NASDAQ      Stock Market (US only)       |   | $      | 100.00 |   |   | $      | 96.85  |   |   | $      | 115.07 |   |   | $      | 119.36 |   |   | $      | 110.25 |   |   | $ | 61.04 |   |
| NASDAQ      Electronic Components Stocks |   | $      | 100.00 |   |   | $      | 76.09  |   |   | $      | 87.44  |   |   | $      | 85.64  |   |   | $      | 82.76 |   |   | $ | 58.14 |   |
| Supertex,      Inc.                      |   | $      | 100.00 |   |   | $      | 105.71 |   |   | $      | 223.93 |   |   | $      | 197.68 |   |   | $      | 122.20 |   |   | $ | 145.42 |   |

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|                |   | Fiscal      Years Ended |   |
|---------------------|--------|-------------------------|--------|
|                |   | March      28, 2009     |   |   | March      29, 2008 |   |
|                |   | High                    |   |   | Low |   |   | High |   |   | Low |   |
| First      Quarter  |   | $                       | 26.13  |   |   | $ | 20.18 |   |   | $ | 35.14 |   |   | $ | 30.62 |   |
| Second      Quarter |   |                    | 33.50  |   |   |   | 23.21 |   |   |   | 40.00 |   |   |   | 31.79 |   |
| Third      Quarter  |   |                    | 28.44  |   |   |   | 18.26 |   |   |   | 45.29 |   |   |   | 30.38 |   |
| Fourth      Quarter |   |                    | 24.43  |   |   |   | 18.53 |   |   |   | 31.29 |   |   |   | 17.70 |   |

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|                                                            |   | Number      of Securities to be Issued upon Exercise of Outstanding Options, Warrants,      and Rights |      |   | Weighted-Average      Exercise Price of Outstanding Options, Warrants, andRights |   |   | Number      of Securities Remaining Available for Future Issuance under Equity      Compensation Plans (Excluding Securities Reflected in Column      (a) |   |
|-----------------------------------------------------------------|--------|--------------------------------------------------------------------------------------------------------|-----------|--------|----------------------------------------------------------------------------------|--------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|--------|
| Plan      Category                                              |   | (a)                                                                                                    |      |   | (b)                                                                              |   |   | (c)                                                                                                                                                       |   |
| Equity      compensation plans approved by security holders     |   |                                                                                                   | 1,467,835 |   |                                                                             | $      | 26.94  |                                                                                                                                                      |   |   | 378,963 | (1) |
| Equity      compensation plans not approved by security holders |   |                                                                                                   | 0         |   |                                                                             |   | N/A    |                                                                                                                                                      |   |   | 0 |   |

Item 6.  Selected FinancialData

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|                                          |   | March      28, |    |   | March      29, |   |    | March      31, |   |   | April      1, |   |   | April      2, |    |
|-----------------------------------------------|--------|----------------|---------|--------|----------------|--------|---------|----------------|--------|--------|---------------|--------|--------|---------------|---------|
| (in      thousands, except per share amounts) |   | 2009           |    |   | 2008           |   |    | 2007           |   |   | 2006          |   |   | 2005          |    |
| Balance      Sheet Data:                      |   |           |    |   |           |   |    |           |   |   |          |   |   |          |    |
| Total      assets                             |   | $              | 190,304 |   |           | $      | 177,351 |           |   | $      | 185,932       |   |   | $             | 156,133 |   |   | $ | 126,377 |   |
| Total      liabilities                        |   | $              | 22,728  |   |           | $      | 25,476  |           |   | $      | 24,680        |   |   | $             | 22,709  |   |   | $ | 19,282 |   |
|                                          |   |           |    |   |           |   |    |           |   |   |          |   |   |          |    |   |   |   |   |   |
| Statement      of Income Data:                |   |           |    |   |           |   |    |           |   |   |          |   |   |          |    |   |   |   |   |   |
| Net      Sales                                |   | $              | 78,810  |   |           | $      | 82,559  |           |   | $      | 98,020        |   |   | $             | 80,098  |   |   | $ | 56,558 |   |
| Income      from operations                   |   |           | 13,994  |   |           |   | 16,492  |           |   |   | 27,904        |   |   |          | 19,532  |   |   |   | 7,650 |   |
| Net      income                               |   | $              | 12,545  |   |           | $      | 17,005  |           |   | $      | 21,427        |   |   | $             | 15,877  |   |   | $ | 6,459 |   |
| Net      income per share:                    |   |           |    |   |           |   |    |           |   |   |          |   |   |          |    |   |   |   |   |   |
| Basic                                         |   | $              | 0.98    |   |           | $      | 1.25    |           |   | $      | 1.56          |   |   | $             | 1.19    |   |   | $ | 0.50 |   |
| Diluted                                       |   | $              | 0.97    |   |           | $      | 1.23    |           |   | $      | 1.53          |   |   | $             | 1.15    |   |   | $ | 0.49 |   |
| Shares      used in per share computation:    |   |           |    |   |           |   |    |           |   |   |          |   |   |          |    |   |   |   |   |   |
| Basic                                         |   |           | 12,836  |   |           |   | 13,585  |           |   |   | 13,715        |   |   |          | 13,313  |   |   |   | 12,985 |   |
| Diluted                                       |   |           | 12,927  |   |           |   | 13,790  |           |   |   | 14,040        |   |   |          | 13,770  |   |   |   | 13,239 |   |

Item 7.  Management's Discussion and Analysis of FinancialCondition and Results of Operations

|                                          |   | Fiscal      Years Ended |   |
|-----------------------------------------------|--------|-------------------------|--------|
|                                          |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Net      sales                                |   |                    | 100.0  | % |   |   | 100.0 | % |   |   | 100.0 | % |
| Cost      of sales                            |   |                    | 46.9   |   |   |   | 43.1 |   |   |   | 40.5 |   |
| Research      and development                 |   |                    | 18.4   |   |   |   | 18.1 |   |   |   | 14.9 |   |
| Selling,      general and administrative      |   |                    | 16.9   |   |   |   | 18.8 |   |   |   | 16.1 |   |
| Income      from operations                   |   |                    | 17.8   |   |   |   | 20.0 |   |   |   | 28.5 |   |
| Interest      and Other income:               |   |                    |   |   |   |   |   |   |   |   |   |   |
| Interest      income                          |   |                    | 4.0    |   |   |   | 7.5 |   |   |   | 5.0 |   |
| Other      income, net                        |   |                    | (1.8   | ) |   |   | (0.3 | ) |   |   | 0.7 |   |
| Income      before provision for income taxes |   |                    | 20.0   |   |   |   | 27.2 |   |   |   | 34.2 |   |
| Provision      for income taxes               |   |                    | 4.1    |   |   |   | 6.6 |   |   |   | 12.3 |   |
| Net      income                               |   |                    | 15.9   | % |   |   | 20.6 | % |   |   | 21.9 | % |

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|                     |   | Fiscal      Years Ended |   |   | Year-Over-Year      |   |
|--------------------------|--------|-------------------------|--------|--------|---------------------|--------|
| Markets                  |   | March      28, 2009     |   |   | March      29, 2008 |   |   | Change |   |
| Medical      Electronics |   | $                       | 33,368 |   |                |   | 43 | % |   | $ | 30,381 |   |   |   | 37 | % |   |   | 10 | % |
| Imaging                  |   |                    | 20,550 |   |                |   | 26 | % |   |   | 26,473 |   |   |   | 32 | % |   |   | -22 | % |
| Industrial/Other         |   |                    | 12,780 |   |                |   | 16 | % |   |   | 13,119 |   |   |   | 16 | % |   |   | -3 | % |
| Telecom                  |   |                    | 7,139  |   |                |   | 9 | % |   |   | 8,715 |   |   |   | 10 | % |   |   | -18 | % |
| LED      Lighting        |   |                    | 4,973  |   |                |   | 6 | % |   |   | 3,871 |   |   |   | 5 | % |   |   | 28 | % |
| Net      Sales           |   | $                       | 78,810 |   |                |   | 100 | % |   | $ | 82,559 |   |   |   | 100 | % |   |   | -5 | % |

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|                        |   | Fiscal      Years Ended |   |   | Year-Over-Year      |   |
|-----------------------------|--------|-------------------------|--------|--------|---------------------|--------|
| (Dollars      in thousands) |   | March      28, 2009     |   |   | March      29, 2008 |   |   | Change |   |
| United      States          |   | $                       | 29,301 |   |                |   | 37 | % |   | $ | 30,162 |   |   |   | 37 | % |   |   | -3 | % |
| Asia      (excl. China)     |   |                    | 20,670 |   |                |   | 26 | % |   |   | 21,645 |   |   |   | 26 | % |   |   | -5 | % |
| China                       |   |                    | 17,968 |   |                |   | 23 | % |   |   | 18,903 |   |   |   | 23 | % |   |   | -5 | % |
| Europe                      |   |                    | 10,093 |   |                |   | 13 | % |   |   | 11,005 |   |   |   | 13 | % |   |   | -8 | % |
| Other                       |   |                    | 778    |   |                |   | 1 | % |   |   | 844 |   |   |   | 1 | % |   |   | -8 | % |
| Total      Net Sales        |   | $                       | 78,810 |   |                |   | 100 | % |   | $ | 82,559 |   |   |   | 100 | % |   |   | -5 | % |

|                                                                               |   | Fiscal      Years Ended |   |
|------------------------------------------------------------------------------------|--------|-------------------------|--------|
| (Dollars      in thousands)                                                        |   | March      28, 2009     |   |   | March      29, 2008 |   |
| Gross      Margin Percentage                                                       |   |                    | 53     | % |   |   | 57 | % |
| Included      in Gross Margin Percentage Above                                     |   |                    |   |   |   |   |   |   |
| Gross      Margin Benefit from Cost of Previously Written Down Inventory      Sold |   | $                       | 1,372  |   |   | $ | 1,509 |   |
| Percentage      of Net Sales                                                       |   |                    | 1.7    | % |   |   | 1.8 | % |

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|                               |   | Fiscal      Years Ended |   |   | Year-Over-Year  |   |
|------------------------------------|--------|-------------------------|--------|--------|----------------------|--------|
| (Dollars      in thousands)        |   | March      28, 2009     |   |   | March      29, 2008  |   |   |  Change |   |
|  R&D      Expenses        |   | $                       | 14,553 |   |                 | $      | 14,953 |   |   |   | -3 | % |
|  Percentage of Net      Sales |   |                    | 18     | %      |                 |   | 18 | % |   |   |   |   |

|                         |   | Fiscal      Years Ended |   |   | Year-Over-Year   |   |
|------------------------------|--------|-------------------------|--------|--------|----------------------------|--------|
| (Dollars      in thousands)  |   | March      28, 2009     |   |   | March      29, 2008        |   |   | Change |   |
| SG&A      Expenses       |   | $                       | 13,332 |   |                       | $      | 15,536 |   |   |   | -14 | % |
| Percentage      of Net Sales |   |                    | 17     | %      |                       |   | 19 | % |   |   |   |   |

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|                                              |   | Fiscal      Years Ended |   |   | Year-Over-Year      |   |
|---------------------------------------------------|--------|-------------------------|--------|--------|---------------------|--------|
| (Dollars      in thousands)                       |   | March      28, 2009     |   |   | March      29, 2008 |   |   | Change |   |
| Interest      Income                              |   | $                       | 3,209  |   |                | $      | 6,189 |   |   |   | -48 | % |
| Other      Expense, Net                           |   |                    | (1,437 | )      |                |   | (201 | ) |   |   | 615 | % |
| Total      Interest Income and Other Expense, Net |   | $                       | 1,772  |   |                | $      | 5,988 |   |   |   | -70 | % |
| Percentage      of Net Sales                      |   |                    | 2      | %      |                |   | 7 | % |   |   |   |   |

| (Dollars      in thousands) |   | Fiscal      Years Ended |   |   | Year-Over-Year      |   |
|-----------------------------|--------|-------------------------|--------|--------|---------------------|--------|
| Markets                     |   | March      29, 2008     |   |   | March      31, 2007 |   |   | Change |   |
| Medical      Electronics    |   | $                       | 30,381 |   |                |   | 37 | % |   | $ | 29,336 |   |   |   | 30 | % |   |   | 4 | % |
| Imaging                     |   |                    | 26,473 |   |                |   | 32 | % |   |   | 42,241 |   |   |   | 43 | % |   |   | -37 | % |
| Industrial/Other            |   |                    | 13,119 |   |                |   | 16 | % |   |   | 17,654 |   |   |   | 18 | % |   |   | -26 | % |
| Telecom                     |   |                    | 8,715  |   |                |   | 10 | % |   |   | 7,377 |   |   |   | 8 | % |   |   | 18 | % |
| LED      Lighting           |   |                    | 3,871  |   |                |   | 5 | % |   |   | 1,412 |   |   |   | 1 | % |   |   | 174 | % |
| Net      Sales              |   | $                       | 82,559 |   |                |   | 100 | % |   | $ | 98,020 |   |   |   | 100 | % |   |   | -16 | % |

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|                                |   | Fiscal      Years Ended |   |   | Year-Over-Year      |   |
|-------------------------------------|--------|-------------------------|--------|--------|---------------------|--------|
| (Dollars      in thousands)         |   | March      29, 2008     |   |   | March      31, 2007 |   |   | Change |   |
| China                               |   | $                       | 18,903 |   |                |   | 23 | % |   | $ | 32,449 |   |   |   | 33 | % |   |   | -42 | % |
| Asia      (excl. China & Japan) |   |                    | 14,598 |   |                |   | 18 | % |   |   | 16,209 |   |   |   | 17 | % |   |   | -10 | % |
| United      States                  |   |                    | 30,162 |   |                |   | 37 | % |   |   | 29,265 |   |   |   | 30 | % |   |   | 3 | % |
| Europe                              |   |                    | 11,005 |   |                |   | 13 | % |   |   | 11,834 |   |   |   | 12 | % |   |   | -7 | % |
| Japan                               |   |                    | 7,047  |   |                |   | 8 | % |   |   | 6,860 |   |   |   | 7 | % |   |   | 3 | % |
| Other                               |   |                    | 844    |   |                |   | 1 | % |   |   | 1,403 |   |   |   | 1 | % |   |   | -40 | % |
| Total      Net Sales                |   | $                       | 82,559 |   |                |   | 100 | % |   | $ | 98,020 |   |   |   | 100 | % |   |   | -16 | % |

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|                                                                               |   | Fiscal      Years Ended |   |
|------------------------------------------------------------------------------------|--------|-------------------------|--------|
| (Dollars      in thousands)                                                        |   | March      29, 2008     |   |   | March      31, 2007 |   |
| Gross      Margin Percentage                                                       |   |                    | 57     | % |   |   | 60 | % |
| Included      in Gross Margin Percentage Above                                     |   |                    |   |   |   |   |   |   |
| Gross      Margin Benefit from Cost of Previously Written Down Inventory      Sold |   | $                       | 1,509  |   |   | $ | 1,645 |   |
| Percentage      of Net Sales                                                       |   |                    | 1.8    | % |   |   | 1.7 | % |

|                               |   | Fiscal      Years Ended |   |   | Year-Over-Year   |   |
|------------------------------------|--------|-------------------------|--------|--------|----------------------------|--------|
| (Dollars      in thousands)        |   | March      29, 2008     |   |   | March      31, 2007        |   |   | Change |   |
|  R&D      Expenses        |   | $                       | 14,953 |   |                       | $      | 14,645 |   |   |   | 2 | % |
|  Percentage of Net      Sales |   |                    | 18     | %      |                       |   | 15 | % |   |   |   |   |

|                         |   | Fiscal      Years Ended |   |   | Year-Over-Year   |   |
|------------------------------|--------|-------------------------|--------|--------|----------------------------|--------|
| (Dollars      in thousands)  |   | March      29, 2008     |   |   | March      31, 2007        |   |   | Change |   |
| SG&A      Expenses       |   | $                       | 15,536 |   |                       | $      | 15,800 |   |   |   | -2 | % |
| Percentage      of Net Sales |   |                    | 19     | %      |                       |   | 16 | % |   |   |   |   |

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|                                      |   | Fiscal      Years Ended |   |   | Year-Over-Year      |   |
|-------------------------------------------|--------|-------------------------|--------|--------|---------------------|--------|
| (Dollars      in thousands)               |   | March      29, 2008     |   |   | March      31, 2007 |   |   | Change |   |
| Interest      Income, Net                 |   | $                       | 6,189  |   |                | $      | 4,887 |   |   |   | 27 | % |
| Other      Income (expense), Net          |   |                    | (201   | )      |                |   | 707 |   |   |   | -128 | % |
| Total      Interest and Other Income, Net |   | $                       | 5,988  |   |                | $      | 5,594 |   |   |   | 7 | % |
| Percentage      of Net Sales              |   |                    | 7      | %      |                |   | 6 | % |   |   |   |   |

|                                                      |   | Fiscal      Years Ended |    |
|-----------------------------------------------------------|--------|-------------------------|---------|
| (Dollars      in thousands)                               |   | March      28, 2009     |    |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Net      cash provided by operating activities            |   | $                       | 22,406  |   |   | $ | 15,912 |   |   | $ | 27,465 |   |
| Net      cash provided by (used in) investing activities  |   |                    | (17,792 | ) |   |   | 4,251 |   |   |   | (36,170 | ) |
| Net      cash provided by (used in) financing activities  |   |                    | 1,728   |   |   |   |     (24,913 | ) |   |   | 3,703 |   |
| Net      increase (decrease) in cash and cash equivalents |   | $                       | 6,342   |   |   | $ | (4,750 | ) |   | $ | (5,002 | ) |

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| ·   | the      decline in market value is due to unusual general market      conditions; |
|--------------------|------------------------------------------------------------------------------------|

| ·   | recently,      some ARS were redeemed at parvalue; |
|--------------------|----------------------------------------------------|

| ·   | these      investments are of high credit quality and a significant portion of them      are collateralized and are guaranteed by the US Department of      Education; |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | there      have been no defaults on the ARS we held as of March 28,    2009; |
|--------------------|------------------------------------------------------------------------------|

| ·   | their      AAA or Aaa credit ratings have not been reduced as of March 28,      2009; |
|--------------------|---------------------------------------------------------------------------------------|

| ·   | we      have the intent and ability to hold these investments until the      anticipated recovery in market value occurs;and |
|--------------------|------------------------------------------------------------------------------------------------------------------------------|

| ·   | we      received two payments of $11,200,000 and $50,000 in July 2008 and April      2009, respectively for one ARS, and a payment of $950,000 in December 2008      for another ARS, representing approximately 87% and 19% of our holdings of      two ARS, respectively, both of which were partially redeemed at par      value. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|                                    |   |   |   |   | Payment      Due by Year |   |
|-----------------------------------------|--------|--------|--------|--------|--------------------------|--------|
| Contractual      Obligations            |   | Total  |   |   | Less      than 1 Year    |   |   | 1-2      Years |   |   | 2-3      Years |   |
| Operating      lease obligations (1)    |   | $      | 2,275  |   |                     | $      | 1,132 |   |   | $ | 1,041 |   |   | $ | 102 |   |
| Purchase      obligations               |   |   | 4,835  |   |                     |   | 4,366 |   |   |   | 463 |   |   |   | 6 |   |
| Total      Contractual Cash Obligations |   | $      | 7,110  |   |                     | $      | 5,498 |   |   | $ | 1,504 |   |   | $ | 108 |   |

|        (1) | We      lease facilities under non-cancelable lease agreements expiring at various      times through September 2011.  Rental expense, net of sublease      income for fiscal 2009, amounted to$1,151,000. |
|-----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|                              |   | Fiscal      Years Ended |   |
|-----------------------------------|--------|-------------------------|--------|
|                              |   | March      28, 2009     |   |   | March      29, 2008 |   |
| Number      of shares repurchased |   |                    | -      |   |   |   | 1,173,000 |   |
| Cost      of shares repurchased   |   | $                       | -      |   |   | $ | 27,371,000 |   |
| Average      price per share      |   | $                       | -      |   |   | $ | 23.33 |   |

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Item 7A.   Quantitative andQualitative Disclosures about Market Risk

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Item 8.  Financial Statements and SupplementaryData

|                                          |   | Quarters      Ended                           |   |
|-----------------------------------------------|--------|-----------------------------------------------|--------|
|                                          |   | Mar      28,                                  |   |   | Dec      27, |   |   | Sep      27, |   |   | Jun      28, |   |   | Mar      29, |   |   | Dec      29, |   |   | Sep      29, |   |   | Jun      30, |   |
|                                          |   | 2009                                          |   |   | 2008 |   |   | 2008 |   |   | 2008 |   |   | 2008 |   |   | 2007 |   |   | 2007 |   |   | 2007 |   |
| (Unaudited)                                   |   | (in      thousands, except per share amounts) |   |
| Statement      of Income Data:                |   |                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net      sales                                |   | $                                             | 15,010 |   |   | $ | 17,596 |   |   | $ | 23,453 |   |   | $ | 22,751 |   |   | $ | 19,621 |   |   | $ | 20,147 |   |   | $ | 22,029 |   |   | $ | 20,762 |   |
| Costs      of sales                           |   |                                          | 8,691  |   |   |   | 8,076 |   |   |   | 10,164 |   |   |   | 10,000 |   |   |   | 9,567 |   |   |   | 8,915 |   |   |   | 9,020 |   |   |   | 8,076 |   |
| Gross      profit                             |   |                                          | 6,319  |   |   |   | 9,520 |   |   |   | 13,289 |   |   |   | 12,751 |   |   |   | 10,054 |   |   |   | 11,232 |   |   |   | 13,009 |   |   |   | 12,686 |   |
| Income      from operations                   |   |                                          | 593    |   |   |   | 2,896 |   |   |   | 5,587 |   |   |   | 4,918 |   |   |   | 2,272 |   |   |   | 3,986 |   |   |   | 4,959 |   |   |   | 5,275 |   |
| Income      before provision for income taxes |   |                                          | 820    |   |   |   | 2,752 |   |   |   | 6,301 |   |   |   | 5,893 |   |   |   | 3,834 |   |   |   | 5,318 |   |   |   | 6,546 |   |   |   | 6,782 |   |
| Net      income                               |   | $                                             | 944    |   |   | $ | 2,612 |   |   | $ | 4,549 |   |   | $ | 4,440 |   |   | $ | 4,354 |   |   | $ | 3,677 |   |   | $ | 4,501 |   |   | $ | 4,473 |   |
| Net      income per share(1)                  |   |                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Basic                                         |   | $                                             | 0.07   |   |   | $ | 0.20 |   |   | $ | 0.35 |   |   | $ | 0.35 |   |   | $ | 0.33 |   |   | $ | 0.27 |   |   | $ | 0.33 |   |   | $ | 0.32 |   |
| Diluted                                       |   | $                                             | 0.07   |   |   | $ | 0.20 |   |   | $ | 0.35 |   |   | $ | 0.34 |   |   | $ | 0.33 |   |   | $ | 0.26 |   |   | $ | 0.32 |   |   | $ | 0.32 |   |

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Item 9.  Changes in and Disagreements withAccountants on Accounting and Financial Disclosure

Item 9A.  Controls and Procedures

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Item 9B.  OtherInformation.

Item 10.  Directors, ExecutiveOfficers and Corporate Governance

Item 11.  ExecutiveCompensation

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Item 12.  Security Ownership of CertainBeneficial Owners and Management and Related StockholderMatters

Item 13.  Certain Relationships andRelated Transactions, and Director Independence

Item 14.  Principal Accountant Fees andServices

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| Item 15.   Exhibits and Financial      Statement Schedules |                                                         |
|---------------------------------------------------------------------------|--------------------------------------------------------------|
|                                                                      |                                                         |   |   |
| (a)                                                                       | The      following documents are filed as part of this form: |   |
|                                                                      |                                                         |   | Page |
| 1.                                                                        | Report      of Independent Registered Public Accounting Firm | 41 |
|                                                                      |                                                         |   |   |
| 2.                                                                        | Consolidated      Financial Statements:                      |   |
|                                                                      |                                                         | Consolidated      Balance Sheets at March 28, 2009 and March 29, 2008 | 42 |
|                                                                      |                                                         | For      the three years ended March 28, 2009, March 29, 2008 and March 31,      2007: |   |
|                                                                      |                                                         | Consolidated      Statements of Income | 43 |
|                                                                      |                                                         | Consolidated      Statements of Shareholders' Equity | 44 |
|                                                                      |                                                         | Consolidated      Statements of Cash Flows | 45 |
|                                                                      |                                                         | Notes      to Consolidated Financial Statements | 46 |

| 3.     | Exhibits.                       |
|--------|---------------------------------|
|   |                            |   |
|   | Exhibit                         | Exhibit      Description |
|   |                            |   |
|   | 2.1      (1)                    | Agreement      for purchases and sale of assets by and between Supertex, Inc. and Orbit      Semiconductor dated January 16, 1999. |
|   |                            |   |
|   | 3.1      (2)                    | Restated      Articles of Incorporation of Registrant filed May 21,  1980. |
|   |                            |   |
|   | 3.2      (2)                    | Certificate      of Amendment of Articles of Incorporation filed April 16,      1981. |
|   |                            |   |
|   | 3.3      (2)                    | Certificate      of Amendment of Articles of Incorporation filed September 30,      1983. |
|   |                            |   |
|   | 3.4      (3)                    | Certificate      of Amendment of Articles of Incorporation filed October 14,      1988. |
|   |                            |   |
|   | 3.5      (5)                    | Bylaws      of Registrant, as amended. |
|   |                            |   |
|   | 10      (2)                     | Deferred      Compensation Plan, which became effective January 1,  1996. |
|   | 10.2      (1)                   | Lease      Assignment agreement for 71 Vista Montana, San Jose, California, dated      February 1, 1999 among Orbit Semiconductor, as      assignor, Sobrato Development Companies #871, as landlord, and Supertex,      Inc., as assignee. |
|   |                            |   |
|   | 10.6      (4)    | 1991      Stock Option Plan which became effective, with form of stock option      agreement. |
|   |                            |   |
|   | 10.6a      (5)                  | 1991      Stock Option Plan, as amended as of August 4, 1995, with form of stock      option agreement. |
|   |                            |   |
|   | 10.6b      (6)                  | 1991      Stock Option Plan, as amended as of August 6, 1999, with form of stock      option agreement. |
|   |                            |   |
|   | 10.6c      (7)        | 2000      Employee Stock Purchase Plan. |
|   |                            |   |
|   | 10.6d      (8)                  | 2001      Stock Option Plan, which became effective, with form of stock option      agreement. |
|   |                            |   |
|   | 10.7      (2)                   | Profit      Sharing Plan. |

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|      | 21.1                                                                                     | Subsidiary      of the Registrant.                                                                                                                                                                                                                                            |
|-----------|------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | 23.1               | Consent      of PricewaterhouseCoopers LLP, Independent Registered Public Accounting      Firm.                                                                                                                                                                               |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | 24.1                                                                                     | Power      of Attorney (See signature page).                                                                                                                                                                                                                                  |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | 31.1                                                                                     | Certification      of Chief Executive Officer pursuant to Securities Exchange Act Rules      13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the      Sarbanes-Oxley Act of 2002.                                                                              |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | 31.2                                                                                     | Certification      of Chief Financial Officer pursuant to Securities Exchange Act Rules      13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the      Sarbanes-Oxley Act of 2002.                                                                              |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | 32.1                                                                                     | Certification      of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted      pursuant to Section 906 of the Sarbanes-Oxley Act of  2002.                                                                                                                 |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | 32.2                                                                                     | Certification      of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted      pursuant to Section 906 of the Sarbanes-Oxley Act of  2002.                                                                                                                 |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | (1)                                                                                      | Incorporated      by reference to the exhibit of the same number filed with current report      on form 8-K dated January 19, 1999.                                                                                                                                           |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | (2)                                                                                      | Incorporated      by reference to exhibit of same number of Registrant's Registration      Statement on Form S-1 (File No. 2-86898), which became effective December      6, 1983.                                                                                            |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | (3)                                                                                      | Incorporated      by reference to exhibit filed with Quarterly Report on Form 10-Q for      period ended October 1, 1988.                                                                                                                                                     |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | (4)                                                                                      | Incorporated      by reference to exhibit filed with Annual Report on Form 10-K for year      ended March 31, 1991.                                                                                                                                                           |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | (5)                                                                                      | Incorporated      by reference to exhibit included in Registrant's Registration Statement on      Form S-8 (File No. 33-43691) which became effective September 1,      1995.                                                                                                 |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | (6)                                                                                      | Incorporated      by reference to exhibit included in Registrant's Registration Statement on      Form S-8 (File No. 33-43691) which became effective September 29,      1999.                                                                                                |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | (7)                                                                                      | Incorporated      by reference to exhibit included in Registrant's  Registration      Statement on Form S-8 (File No. 333-47606) which became effective October      6, 2000.                                                                                       |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
|      | (8)                                                                                      | Incorporated      by reference to Appendix B of the Registrants amended Proxy Statement      filed on August 7, 2001 (File No. 000-12718).  Corresponding      Registration Statement on Form S-8 (File No. 333-69594) became effective      on September 18, 2001. |
|      |                                                                                     |                                                                                                                                                                                                                                                                          |
| (b)  | Exhibits      23.1, 24.1, 31.1, 31.2, 32.1 and 32.2 are filed  herewith.                 |

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SIGNATURES

|                                |   | Supertex,      Inc. |
|-------------------------------------|--------|---------------------|
|                                |   |                |   |
|                                |   |                |   |
| Dated:  June      8, 2009 |   |                | /s/PHILLIP      A. KAGEL |
|                                |   |                | Phillip      A. Kagel |
|                                |   |                | Vice      President, Finance and Chief Financial Officer |
|                                |   |                | (Principal      Financial and Accounting Officer) |

| Signature                    |   | Title                                                     |   | Date              |
|------------------------------|--------|-----------------------------------------------------------|--------|-------------------|
|                         |   |                                                      |   |              |
| /s/ HENRY C.      PAO        |   | Director,      President and Chief Executive Officer |   | June      8, 2009 |
| (Henry      C. Pao)          |   | (Principle      Executive Officer)              |   |              |
|                         |   |                                                      |   |              |
| /s/ PHILLIP A.      KAGEL    |   | Vice      President, Finance and Chief Financial Officer  |   | June      8, 2009 |
| (Phillip      A. Kagel)      |   | (Principal      Financial and Accounting Officer)         |   |              |
|                         |   |                                                      |   |              |
| /s/ BENEDICT C. K.      CHOY |   | Senior      Vice President, Technology Development        |   | June      8, 2009 |
| (Benedict      C. K. Choy)   |   |                                                      |   |              |
|                         |   |                                                      |   |              |
| /s/ W. MARK      LOVELESS    |   | Director                                                  |   | June      8, 2009 |
| (W.      Mark Loveless)      |   |                                                      |   |              |
|                         |   |                                                      |   |              |
| /s/ ELLIOTT      SCHLAM      |   | Director                                                  |   | June      8, 2009 |
| (Elliott      Schlam)        |   |                                                      |   |              |
|                         |   |                                                      |   |              |
| /s/ MILTON      FENG         |   | Director                                                  |   | June      8, 2009 |
| (Milton      Feng)           |   |                                                      |   |              |
|                         |   |                                                      |   |              |

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SUPERTEX, INC.

CONSOLIDATED BALANCE SHEETS

|                                                                                                                                        |   | March      28, 2009 |    |   | March      29, 2008 |   |
|---------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------|---------|--------|---------------------|--------|
| ASSETS                                                                                                                                      |   |                |    |   |                |   |
| Current      Assets:                                                                                                                        |   |                |    |   |                |   |
| Cash      and cash equivalents                                                                                                              |   | $                   | 24,244  |   |                | $      | 17,902 |   |
| Short-term      investments                                                                                                                 |   |                | 33,294  |   |                |   | 6,827 |   |
| Trade      accounts receivable, net                                                                                                         |   |                | 8,115   |   |                |   | 13,197 |   |
| Inventories,      net                                                                                                                       |   |                | 15,700  |   |                |   | 17,036 |   |
| Prepaid      expenses and other current assets                                                                                              |   |                | 1,654   |   |                |   | 3,647 |   |
| Prepaid      income taxes                                                                                                                   |   |                | 4,588   |   |                |   | - |   |
| Deferred      income taxes                                                                                                                  |   |                | 7,625   |   |                |   | 9,401 |   |
| Total      current assets                                                                                                                   |   |                | 95,220  |   |                |   | 68,010 |   |
| Long-term      investments                                                                                                                  |   |                | 79,496  |   |                |   | 96,531 |   |
| Property,      plant and equipment, net                                                                                                     |   |                | 8,473   |   |                |   | 9,916 |   |
| Other      assets                                                                                                                           |   |                | 389     |   |                |   | 373 |   |
| Deferred      income taxes                                                                                                                  |   |                | 6,726   |   |                |   | 2,521 |   |
| Total      assets                                                                                                                           |   | $                   | 190,304 |   |                | $      | 177,351 |   |
|                                                                                                                                        |   |                |    |   |                |   |   |   |
|                                                                                                                                        |   |                |    |   |                |   |   |   |
| LIABILITIES      AND SHAREHOLDERS’ EQUITY                                                                                             |   |                |    |   |                |   |   |   |
| Current      Liabilities:                                                                                                                   |   |                |    |   |                |   |   |   |
| Trade      accounts payable                                                                                                                 |   | $                   | 2,934   |   |                | $      | 3,280 |   |
| Accrued      salaries and employee benefits                                                                                                 |   |                | 8,909   |   |                |   | 12,146 |   |
| Other      accrued liabilities                                                                                                              |   |                | 888     |   |                |   | 1,741 |   |
| Deferred      revenue                                                                                                                       |   |                | 3,276   |   |                |   | 4,349 |   |
| Income      taxes payable                                                                                                                   |   |                | 1,882   |   |                |   | - |   |
| Total      current liabilities                                                                                                              |   |                | 17,889  |   |                |   | 21,516 |   |
| Income      taxes payable, noncurrent                                                                                                       |   |                | 4,839   |   |                |   | 3,960 |   |
| Total      liabilities                                                                                                                      |   |                | 22,728  |   |                |   | 25,476 |   |
|                                                                                                                                        |   |                |    |   |                |   |   |   |
| Commitments      and contingencies (Note 14)                                                                                                |   |                |    |   |                |   |   |   |
|                                                                                                                                        |   |                |    |   |                |   |   |   |
| Shareholders’      equity:                                                                                                            |   |                |    |   |                |   |   |   |
| Preferred      stock, no par value -- 10,000 shares authorized, none      outstanding                                                       |   |                | -       |   |                |   | - |   |
| Common      stock, no par value -- 30,000 shares authorized;      issued and outstanding 12,872 shares (2009) and 12,749 shares      (2008) |   |                | 59,549  |   |                |   | 54,968 |   |
| Accumulated      other comprehensive loss                                                                                                   |   |                | (5,494  | )      |                |   | (4,069 | ) |
| Retained      earnings                                                                                                                      |   |                | 113,521 |   |                |   | 100,976 |   |
| Total      shareholders' equity                                                                                                             |   |                | 167,576 |   |                |   | 151,875 |   |
| Total      liabilities and shareholders' equity                                                                                             |   | $                   | 190,304 |   |                | $      | 177,351 |   |

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|                                          |   | Fiscal      Years Ended |   |
|-----------------------------------------------|--------|-------------------------|--------|
|                                          |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Net      sales                                |   | $                       | 78,810 |   |   | $ | 82,559 |   |   | $ | 98,020 |   |
| Cost      and expenses:                       |   |                    |   |   |   |   |   |   |   |   |   |   |
| Cost      of sales                            |   |                    | 36,931 |   |   |   | 35,578 |   |   |   | 39,671 |   |
| Research      and development                 |   |                    | 14,553 |   |   |   | 14,953 |   |   |   | 14,645 |   |
| Selling,      general and administrative      |   |                    | 13,332 |   |   |   | 15,536 |   |   |   | 15,800 |   |
| Total      costs and expenses                 |   |                    | 64,816 |   |   |   | 66,067 |   |   |   | 70,116 |   |
| Income      from operations                   |   |                    | 13,994 |   |   |   | 16,492 |   |   |   | 27,904 |   |
| Interest      and other income:               |   |                    |   |   |   |   |   |   |   |   |   |   |
| Interest      income                          |   |                    | 3,209  |   |   |   | 6,189 |   |   |   | 4,887 |   |
| Other      income(expense), net               |   |                    | (1,437 | ) |   |   | (201 | ) |   |   | 707 |   |
| Income      before provision for income taxes |   |                    | 15,766 |   |   |   | 22,480 |   |   |   | 33,498 |   |
| Provision      for income taxes               |   |                    | 3,221  |   |   |   | 5,475 |   |   |   | 12,071 |   |
| Net      income                               |   | $                       | 12,545 |   |   | $ | 17,005 |   |   | $ | 21,427 |   |
|                                          |   |                    |   |   |   |   |   |   |   |   |   |   |
| Net      income per share                     |   |                    |   |   |   |   |   |   |   |   |   |   |
| Basic                                         |   | $                       | 0.98   |   |   | $ | 1.25 |   |   | $ | 1.56 |   |
| Diluted                                       |   | $                       | 0.97   |   |   | $ | 1.23 |   |   | $ | 1.53 |   |
| Shares      used in per share computation     |   |                    |   |   |   |   |   |   |   |   |   |   |
| Basic                                         |   |                    | 12,836 |   |   |   | 13,585 |   |   |   | 13,715 |   |
| Diluted                                       |   |                    | 12,927 |   |   |   | 13,790 |   |   |   | 14,040 |   |

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|                                                                   |   | Number      of Common Shares |   |   | Stock      Amount |   |   | Accumulated      Other Comprehensive Loss |   |   | Retained      Earnings |   |   | Shareholders’      Equity |    |
|------------------------------------------------------------------------|--------|------------------------------|--------|--------|-------------------|--------|--------|-------------------------------------------|--------|--------|------------------------|--------|--------|---------------------------------|---------|
|                                                                   |   |                         |   |   |              |   |   |                                      |   |   |                   |   |   |                            |    |
| Balance,      April 1, 2006                                            |   |                         | 13,608 |   |              | $      | 46,692 |                                      |   | $      | -                      |   |   | $                               | 86,732  |   |   | $ | 133,424 |   |
| Stock      options exercised                                           |   |                         | 229    |   |              |   | 4,278  |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 4,278 |   |
| Shares      received in lieu of cash for exercise of options           |   |                         | (8     | )      |              |   | (387   | )                                         |   |   | -                      |   |   |                            | -       |   |   |   | (387 | ) |
| Issuance      of shares under ESPP                                     |   |                         | 20     |   |              |   | 657    |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 657 |   |
| Stock      repurchased                                                 |   |                         | (55    | )      |              |   | (205   | )                                         |   |   | -                      |   |   |                            | (1,648  | ) |   |   | (1,853 | ) |
| Stock-based      compensation expense                                  |   |                         | -      |   |              |   | 2,428  |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 2,428 |   |
| Tax      benefit from stock-based compensation                         |   |                         | -      |   |              |   | 1,278  |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 1,278 |   |
| Net      income                                                        |   |                         | -      |   |              |   | -      |                                      |   |   | -                      |   |   |                            | 21,427  |   |   |   | - |   |
| Total      comprehensive income                                        |   |                         | -      |   |              |   | -      |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 21,427 |   |
| Balance,      March 31, 2007                                           |   |                         | 13,794 |   |              |   | 54,741 |                                      |   |   | -                      |   |   |                            | 106,511 |   |   |   | 161,252 |   |
| Stock      options exercised                                           |   |                         | 123    |   |              |   | 2,041  |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 2,041 |   |
| Issuance      of shares under ESPP                                     |   |                         | 5      |   |              |   | 179    |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 179 |   |
| Stock      repurchased                                                 |   |                         | (1,173 | )      |              |   | (4,924 | )                                         |   |   | -                      |   |   |                            | (22,447 | ) |   |   | (27,371 | ) |
| Stock-based      compensation expense                                  |   |                         | -      |   |              |   | 2,545  |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 2,545 |   |
| Tax      benefit from stock-based compensation                         |   |                         | -      |   |              |   | 386    |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 386 |   |
| Adjustment      to retained earnings upon adoption of FIN 48           |   |                         |   |   |              |   |   |                                      |   |   |                   |   |   |                            | (93     | ) |   |   | (93 | ) |
| Net      income                                                        |   |                         | -      |   |              |   | -      |                                      |   |   | -                      |   |   |                            | 17,005  |   |   |   | - |   |
| Unrealized      loss from available-for-sale investments               |   |                         | -      |   |              |   | -      |                                      |   |   | (4,069                 | )      |   |                            | -       |   |   |   | - |   |
| Total      comprehensive income                                        |   |                         | -      |   |              |   | -      |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 12,936 |   |
| Balance,      March 29, 2008                                           |   |                         | 12,749 |   |              |   | 54,968 |                                      |   |   | (4,069                 | )      |   |                            | 100,976 |   |   |   | 151,875 |   |
| Stock      options exercised                                           |   |                         | 115    |   |              |   | 1,504  |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 1,504 |   |
| Issuance      of shares under ESPP                                     |   |                         | 8      |   |              |   | 167    |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 167 |   |
| Stock-based      compensation expense                                  |   |                         | -      |   |              |   | 2,761  |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 2,761 |   |
| Tax      benefit from stock-based compensation                         |   |                         | -      |   |              |   | 149    |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 149 |   |
| Net      income                                                        |   |                         | -      |   |              |   | -      |                                      |   |   | -                      |   |   |                            | 12,545  |   |   |   | - |   |
| Unrealized      loss from available-for-sale investments, net of taxes |   |                         | -      |   |              |   | -      |                                      |   |   | (1,425                 | )      |   |                            | -       |   |   |   | - |   |
| Total      comprehensive income                                        |   |                         | -      |   |              |   | -      |                                      |   |   | -                      |   |   |                            | -       |   |   |   | 11,120 |   |
| Balance,      March 28, 2009                                           |   |                         | 12,872 |   |              | $      | 59,549 |                                      |   | $      | (5,494                 | )      |   | $                               | 113,521 |   |   | $ | 167,576 |   |

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|                                                                                                   |   | Fiscal      Years Ended |    |
|--------------------------------------------------------------------------------------------------------|--------|-------------------------|---------|
|                                                                                                   |   | March      28, 2009     |    |   | March      29, 2008 |   |   | March      31, 2007 |   |
|        CASH      FLOWS FROM OPERATING ACTIVITIES                                                  |   |                    |    |   |   |   |   |   |   |
| Net      income                                                                                        |   | $                       | 12,545  |   |   | $ | 17,005 |   |   | $ | 21,427 |   |
| Non-cash      adjustments to net income:                                                               |   |                    |    |   |   |   |   |   |   |   |   |   |
| Depreciation      and amortization                                                                     |   |                    | 3,397   |   |   |   | 3,206 |   |   |   | 2,904 |   |
| Provision      for doubtful accounts and sales returns                                                 |   |                    | 646     |   |   |   | 1,151 |   |   |   | 854 |   |
| Provision      for excess and obsolete inventories                                                     |   |                    | 4,439   |   |   |   | 3,217 |   |   |   | 2,454 |   |
| Deferred      income taxes                                                                             |   |                    | 1,071   |   |   |   | (2,900 | ) |   |   | (449 | ) |
| Stock-based      compensation                                                                          |   |                    | 2,761   |   |   |   | 2,545 |   |   |   | 2,428 |   |
| Tax      benefit related to stock-based compensation plans                                             |   |                    | 149     |   |   |   | 386 |   |   |   | 1,278 |   |
| Excess      tax benefit related to stock-based compensation                                            |   |                    | (57     | ) |   |   | (238 | ) |   |   | (1,008 | ) |
| Unrealized      (gain) loss from short-term investments, categorized as      trading                   |   |                    | 1,464   |   |   |   | 374 |   |   |   | (548 | ) |
| (Gain)      loss on disposal of property, plant and equipment                                          |   |                    | 23      |   |   |   | (201 | ) |   |   | - |   |
| Changes      in operating assets and liabilities:                                                      |   |                    |    |   |   |   |   |   |   |   |   |   |
|          Trade accounts receivable                                                      |   |                    | 4,546   |   |   |   | (1,555 | ) |   |   | 1,177 |   |
| Inventories                                                                                            |   |                    | (3,103  | ) |   |   | (6,015 | ) |   |   | (4,149 | ) |
| Prepaid      expenses and other assets                                                                 |   |                    | 1,867   |   |   |   | (1,708 | ) |   |   | (814 | ) |
| Prepaid      income taxes                                                                              |   |                    | (4,588  | ) |   |   | - |   |   |   | - |   |
| Trade      accounts payable and accrued expenses                                                       |   |                    | (4,442  | ) |   |   | (1,288 | ) |   |   | 1,887 |   |
| Deferred      revenue                                                                                  |   |                    | (1,073  | ) |   |   | 1,384 |   |   |   | (601 | ) |
| Income      taxes payable                                                                              |   |                    | 2,761   |   |   |   | 549 |   |   |   | 625 |   |
| Net      cash provided by operating activities                                                         |   |                    | 22,406  |   |   |   | 15,912 |   |   |   | 27,465 |   |
|                                                                                                   |   |                    |    |   |   |   |   |   |   |   |   |   |
| CASH      FLOWS FROM INVESTING ACTIVITIES                                                              |   |                    |    |   |   |   |   |   |   |   |   |   |
| Purchases      of property, plant and equipment, net                                                   |   |                    | (1,971  | ) |   |   | (4,413 | ) |   |   | (3,447 | ) |
| Proceeds      from disposal of property, plant and equipment                                           |   |                    | -       |   |   |   | 201 |   |   |   | - |   |
| Purchases      of investments                                                                          |   |                    | (34,529 | ) |   |   | (138,274 | ) |   |   | (301,142 | ) |
| Sales      of investments                                                                              |   |                    | 18,708  |   |   |   | 146,737 |   |   |   | 268,419 |   |
|  Net      cash provided by (used in) investing activities                                         |   |                    | (17,792 | ) |   |   | 4,251 |   |   |   | (36,170 | ) |
|                                                                                                   |   |                    |    |   |   |   |   |   |   |   |   |   |
| CASH      FLOWS FROM FINANCING ACTIVITIES                                                              |   |                    |    |   |   |   |   |   |   |   |   |   |
| Proceeds      from exercise of stock options and employee stock purchase      plan                     |   |                    | 1,671   |   |   |   | 2,220 |   |   |   | 4,548 |   |
| Stock      repurchased                                                                                 |   |                    | -       |   |   |   | (27,371 | ) |   |   | (1,853 | ) |
| Excess      tax benefit related to stock-based compensation                                            |   |                    | 57      |   |   |   | 238 |   |   |   | 1,008 |   |
| Net      cash provided by (used in) financing activities                                               |   |                    | 1,728   |   |   |   | (24,913 | ) |   |   | 3,703 |   |
|                                                                                                   |   |                    |    |   |   |   |   |   |   |   |   |   |
| NET      INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                              |   |                    | 6,342   |   |   |   | (4,750 | ) |   |   | (5,002 | ) |
|                                                                                                   |   |                    |    |   |   |   |   |   |   |   |   |   |
| CASH      AND CASH EQUIVALENTS:                                                                        |   |                    |    |   |   |   |   |   |   |   |   |   |
| Beginning      of period                                                                               |   |                    | 17,902  |   |   |   | 22,652 |   |   |   | 27,654 |   |
| End      of period                                                                                     |   | $                       | 24,244  |   |   | $ | 17,902 |   |   | $ | 22,652 |   |
|                                                                                                   |   |                    |    |   |   |   |   |   |   |   |   |   |
| Supplemental      cash flow disclosures:                                                               |   |                    |    |   |   |   |   |   |   |   |   |   |
| Income      taxes paid, net of refunds                                                                 |   | $                       | 2,985   |   |   | $ | 8,367 |   |   | $ | 10,866 |   |
|                                                                                                   |   |                    |    |   |   |   |   |   |   |   |   |   |
| Supplemental      disclosure of non-cash activities:                                                   |   |                    |    |   |   |   |   |   |   |   |   |   |
| Additions      to property, plant and equipment included in accounts payable and accrued      expenses |   | $                       | 6       |   |   | $ | 58 |   |   | $ | 60 |   |

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|                              |   | Fair      value measurements |   |
|-----------------------------------|--------|------------------------------|--------|
| Assets                            |   | Level      1                 |   |   | Level      2 |   |   | Level      3 |   |   | Total |   |
| Money      market funds           |   | $                            | -      |   |   | $ | 18,382 |   |   | $ | - |   |   | $ | 18,382 |   |
| Municipal      bonds              |   |                         | -      |   |   |   | 21,077 | (1) |   |   | - |   |   |   | 21,077 |   |
| Variable      rate demand notes   |   |                         | -      |   |   |   | 1,000 | (2) |   |   | - |   |   |   | 1,000 |   |
| Corporate      bonds              |   |                         | -      |   |   |   | 6,557 | (3) |   |   | - |   |   |   | 6,557 |   |
| Commercial      paper             |   |                         | -      |   |   |   | 992 |   |   |   | - |   |   |   | 992 |   |
| Equity      mutual funds          |   |                         | 5,513  |   |   |   | - |   |   |   | - |   |   |   | 5,513 |   |
| Short-term      investment in ARS |   |                         | -      |   |   |   | 50 |   |   |   | - |   |   |   | 50 |   |
| Long-term      investments in ARS |   |                         | -      |   |   |   | - |   |   |   | 79,496 |   |   |   | 79,496 |   |
| Total      assets at fair value   |   | $                            | 5,513  |   |   | $ | 48,058 |   |   | $ | 79,496 |   |   | $ | 133,067 |   |

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| Fair      value measurements of assets using level 3 inputs             |   | Short-term      and long-term investments in ARS |    |
|-------------------------------------------------------------------------|--------|--------------------------------------------------|---------|
| Beginning      balance at March 29, 2008                                |   | $                                                | 96,531  |   |
| Redemption      of investments in ARS                                   |   |                                             | (12,150 | ) |
| Reclassification      from long-term to short-term investments          |   |                                             | (50     | ) |
| Unrealized      loss recorded in "Accumulated other comprehensive loss" |   |                                             | (4,835  | ) |
| Ending      balance at March 28, 2009                                   |   | $                                                | 79,496  |   |

|                                 |   | March      28, 2009 |   |   | March      29, 2008 |   |
|--------------------------------------|--------|---------------------|--------|--------|---------------------|--------|
| Cash                                 |   | $                   | 3,967  |   |                | $      | 4,409 |   |
| Cash      equivalents:               |   |                |   |   |                |   |   |   |
| Money      market funds              |   |                | 18,382 |   |                |   | 13,493 |   |
| Municipal      bonds                 |   |                | 1,635  |   |                |   | - |   |
| Corporate      bonds                 |   |                | 260    |   |                |   | - |   |
| Total      cash and cash equivalents |   | $                   | 24,244 |   |                | $      | 17,902 |   |

|                                |   | March      28, 2009 |   |   | March      29, 2008 |   |
|-------------------------------------|--------|---------------------|--------|--------|---------------------|--------|
|                                |   | Amortized           |   |   | Unrealized          |   |   | Unrealized |   |   | Carrying |   |   | Amortized |   |   | Unrealized |   |   | Unrealized |   |   | Carrying |   |
|                                |   | Cost                |   |   | Gain                |   |   | Loss |   |   | Value |   |   | Cost |   |   | Gain |   |   | Loss |   |   | Value |   |
|                                |   |                |   |   |                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Short-term      investments:        |   |                |   |   |                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Trading      securities:            |   | $                   | 5,513  |   |                | $      | - |   |   | $ | - |   |   | $ | 5,513 |   |   | $ | 6,827 |   |   | $ | - |   |   | $ | - |   |   | $ | 6,827 |   |
| Available-for-sale      securities: |   |                |   |   |                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Auction      rate securities        |   |                | 50     |   |                |   | - |   |   |   | - |   |   |   | 50 |   |   |   | - |   |   |   | - |   |   |   | - |   |   |   | - |   |
| Municipal  bonds          |   |                | 19,438 |   |                |   | 4 |   |   |   | - |   |   |   | 19,442 |   |   |   | - |   |   |   | - |   |   |   | - |   |   |   | - |   |
| Variable      rate demand notes     |   | $                   | 1,000  |   |                |   | - |   |   |   | - |   |   |   | 1,000 |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Corporate      bonds                |   |                | 6,393  |   |                |   | - |   |   |   | (96 | ) |   |   | 6,297 |   |   |   | - |   |   |   | - |   |   |   | - |   |   |   | - |   |
| Commercial      Paper               |   |                | 990    |   |                |   | 2 |   |   |   | - |   |   |   | 992 |   |   |   | - |   |   |   | - |   |   |   | - |   |   |   | - |   |
|                                |   |                |   |   |                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total      short-term investments   |   | $                   | 33,384 |   |                | $      | 6 |   |   | $ | (96 | ) |   | $ | 33,294 |   |   | $ | 6,827 |   |   | $ | - |   |   | $ | - |   |   | $ | 6,827 |   |
|                                |   |                |   |   |                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Long-term      investments:         |   |                |   |   |                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Available-for      sale securities  |   | $                   | 88,400 |   |                | $      | - |   |   | $ | (8,904 | ) |   | $ | 79,496 |   |   | $ | 100,600 |   |   | $ | - |   |   | $ | (4,069 | ) |   | $ | 96,531 |   |

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|                                                  |   | March      28, 2009 |   |   | March      29, 2008 |   |
|-------------------------------------------------------|--------|---------------------|--------|--------|---------------------|--------|
| Short-term      investment:                           |   |                |   |   |                |   |
| Trading      securities:                              |   |                |   |   |                |   |
| Due      in one year or less                          |   | $                   | 5,513  |   |                | $      | 6,827 |   |
| Available-for-sale      securities:                   |   |                |   |   |                |   |   |   |
| Due      in one year or less                          |   |                | 26,731 |   |                |   | - |   |
| Due      after ten years                              |   |                | 1,050  |   |                |   | - |   |
| Total      short-term investments                     |   | $                   | 33,294 |   |                | $      | 6,827 |   |
|                                                  |   |                |   |   |                |   |   |   |
| Long-term      investment:                            |   |                |   |   |                |   |   |   |
| Available-for-sale      securities at amortized cost: |   |                |   |   |                |   |   |   |
| Due      after ten years                              |   | $                   | 79,496 |   |                | $      | 96,531 |   |
| Total      long-term investments                      |   | $                   | 79,496 |   |                | $      | 96,531 |   |

| ·   | the      decline in market value is due to unusual general market      conditions; |
|--------------------|------------------------------------------------------------------------------------|

| ·   | these      investments are of high credit quality of which a significant portion of      the investments are insured; |
|--------------------|-----------------------------------------------------------------------------------------------------------------------|

| ·   | there      have been no defaults by theissuers; |
|--------------------|-------------------------------------------------|

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| ·   | their      AAA or Aaa credit ratings have not been reduced as of March 28,      2009; |
|--------------------|--------------------------------------------------------------------------------------------|

| ·   | the      Company has the intent and ability to hold these investments until the      anticipated recovery in market value occurs;and |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------|

| ·   | the      Company received two payments of $11,200,000 and $50,000 in July 2008 and      April 2009, respectively, and a payment of $950,000 in December 2008,      representing approximately 87% and 19% of its holding of two ARS,      respectively, both of which were partially redeemed at par      value. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                                                         |   | March      28, 2009 |   |   | March      29, 2008 |   |
|--------------------------------------------------------------|--------|---------------------|--------|--------|---------------------|--------|
| Accounts      receivable                                     |   | $                   | 8,876  |   |                | $      | 14,275 |   |
| Less:      Allowance for doubtful accounts and sales returns |   |                | (761   | )      |                |   | (1,078 | ) |
| Total      Trade accounts receivable                         |   | $                   | 8,115  |   |                | $      | 13,197 |   |

| Description                             |   | Balance      at Beginning of Period |   |   | Charge |   | (1)    |   |   | Deductions      and Other |   | (2)    |   |   | Balance      at End of Period |   |
|-----------------------------------------|--------|-------------------------------------|--------|--------|--------|--------|--------|--------|--------|---------------------------|--------|--------|--------|--------|-------------------------------|--------|
| Twelve      months ended March 28, 2009 |   |                                |   |   |   |   |   |   |   |                      |   |   |   |   |                          |   |
| Allowance      for doubtful accounts    |   | $                                   | 595    |   |   | $      | (100   | )      |   |                      |   | $      | -      |   |                          |   |   | $ | 495 |   |
|                                    |   |                                |   |   |   |   |   |   |   |                      |   |   |   |   |                          |   |   |   |   |   |
| Twelve      months ended March 29, 2008 |   |                                |   |   |   |   |   |   |   |                      |   |   |   |   |                          |   |   |   |   |   |
| Allowance      for doubtful accounts    |   | $                                   | 590    |   |   | $      | 5      |   |   |                      |   | $      | -      |   |                          |   |   | $ | 595 |   |
|                                    |   |                                |   |   |   |   |   |   |   |                      |   |   |   |   |                          |   |   |   |   |   |
| Twelve      months ended March 31, 2007 |   |                                |   |   |   |   |   |   |   |                      |   |   |   |   |                          |   |   |   |   |   |
| Allowance      for doubtful accounts    |   | $                                   | 148    |   |   | $      | 466    |   |   |                      |   | $      | (24    | )      |                          |   |   | $ | 590 |   |

| Description                             |   | Balance      at Beginning of Period |   |   | Charge(1) |   |   | Deductions      and Other(2) |   |   | Balance      at End of Period |   |
|-----------------------------------------|--------|-------------------------------------|--------|--------|-----------|--------|--------|------------------------------|--------|--------|-------------------------------|--------|
| Twelve      months ended March 28, 2009 |   |                                |   |   |      |   |   |                         |   |   |                          |   |
| Allowance      for sales returns        |   | $                                   | 483    |   |      | $      | 636    |                         |   | $      | (853                          | )      |   | $ | 266 |   |
|                                    |   |                                |   |   |      |   |   |                         |   |   |                          |   |   |   |   |   |
| Twelve      months ended March 29, 2008 |   |                                |   |   |      |   |   |                         |   |   |                          |   |   |   |   |   |
| Allowance      for sales returns        |   | $                                   | 199    |   |      | $      | 1,146  |                         |   | $      | (862                          | )      |   | $ | 483 |   |
|                                    |   |                                |   |   |      |   |   |                         |   |   |                          |   |   |   |   |   |
| Twelve      months ended March 31, 2007 |   |                                |   |   |      |   |   |                         |   |   |                          |   |   |   |   |   |
| Allowance      for sales returns        |   | $                                   | 525    |   |      | $      | 388    |                         |   | $      | (714                          | )      |   | $ | 199 |   |

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|                                                   |   | March      28, 2009 |   |   | March      29, 2008 |   |
|--------------------------------------------------------|--------|---------------------|--------|--------|---------------------|--------|
| Raw      materials                                     |   | $                   | 1,128  |   |                | $      | 1,075 |   |
| Work-in-process                                        |   |                | 10,449 |   |                |   | 11,463 |   |
| Finished      goods                                    |   |                | 2,470  |   |                |   | 2,462 |   |
| Finished      goods at distributors and on consignment |   |                | 1,653  |   |                |   | 2,036 |   |
| Total      Inventories                                 |   | $                   | 15,700 |   |                | $      | 17,036 |   |

|                                                |   | March      28, 2009 |    |   | March      29, 2008 |   |
|-----------------------------------------------------|--------|---------------------|---------|--------|---------------------|--------|
| Land                                                |   | $                   | 825     |   |                | $      | 825 |   |
| Machinery      and equipment                        |   |                | 39,648  |   |                |   | 42,437 |   |
| Leasehold      improvements                         |   |                | 2,968   |   |                |   | 2,761 |   |
| Building                                            |   |                | 2,563   |   |                |   | 2,504 |   |
| Furniture      and fixtures                         |   |                | 361     |   |                |   | 369 |   |
|                                                |   |                | 46,365  |   |                |   | 48,896 |   |
| Less      accumulated depreciation and amortization |   |                | (37,892 | )      |                |   | (38,980 | ) |
| Property,      plant and equipment, net             |   | $                   | 8,473   |   |                | $      | 9,916 |   |

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|                                          |   | Fiscal      Years Ended |   |
|-----------------------------------------------|--------|-------------------------|--------|
|                                          |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| United      States                            |   | $                       | 11,852 |   |   | $ | 21,725 |   |   | $ | 32,834 |   |
| Foreign                                       |   |                    | 3,914  |   |   |   | 755 |   |   |   | 664 |   |
| Income      before provision for income taxes |   | $                       | 15,766 |   |   | $ | 22,480 |   |   | $ | 33,498 |   |

|                                  |   | Fiscal      Years Ended |   |
|---------------------------------------|--------|-------------------------|--------|
|                                  |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Current:                              |   |                    |   |   |   |   |   |   |   |
| Federal                               |   | $                       | 383    |   |   | $ | 7,773 |   |   | $ | 11,881 |   |
| State                                 |   |                    | 938    |   |   |   | 435 |   |   |   | 1,131 |   |
| Non-US                                |   |                    | 883    |   |   |   | 167 |   |   |   | 177 |   |
|                                  |   |                    | 2,204  |   |   |   | 8,375 |   |   |   | 13,189 |   |
| Deferred:                             |   |                    |   |   |   |   |   |   |   |   |   |   |
| Federal                               |   |                    | 927    |   |   |   | (2,703 | ) |   |   | (1,238 | ) |
| State                                 |   |                    | 132    |   |   |   | (279 | ) |   |   | 118 |   |
| Non-US                                |   |                    | (42    | ) |   |   | 82 |   |   |   | 2 |   |
|                                  |   |                    | 1,017  |   |   |   | (2,900 | ) |   |   | (1,118 | ) |
| Total      provision for income taxes |   | $                       | 3,221  |   |   | $ | 5,475 |   |   | $ | 12,071 |   |

|                                              |   | Fiscal      Years Ended |   |
|---------------------------------------------------|--------|-------------------------|--------|
|                                              |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Tax      provision at US statutory rates          |   |                    | 35     | % |   |   | 35 | % |   |   | 35 | % |
| State      tax provision, net of Federal benefits |   |                    | 4      |   |   |   | 2 |   |   |   | 4 |   |
| Tax      credits                                  |   |                    | (4     | ) |   |   | (2 | ) |   |   | (1 | ) |
| Domestic      production activity deduction       |   |                    | (3     | ) |   |   | (1 | ) |   |   | - |   |
| Foreign      earnings tax differential            |   |                    | (3     | ) |   |   | (1 | ) |   |   | - |   |
| Tax      exempt investment income                 |   |                    | (6     | ) |   |   | (8 | ) |   |   | (4 | ) |
| Stock      based compensation                     |   |                    | 1      |   |   |   | 1 |   |   |   | 2 |   |
| IRS      settlement                               |   |                    | (2     | ) |   |   | (1 | ) |   |   | 1 |   |
| Other                                             |   |                    | (2     | ) |   |   | (1 | ) |   |   | (1 | ) |
| Effective      income tax rate                    |   |                    | 20     | % |   |   | 24 | % |   |   | 36 | % |

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|                                                    |   | Fiscal      Years Ended |   |
|---------------------------------------------------------|--------|-------------------------|--------|
| Deferred      tax assets:                               |   | March      28, 2009     |   |   | March      29, 2008 |   |
| Inventory      write downs                              |   | $                       | 3,945  |   |   | $ | 2,893 |   |
| Investment      write down                              |   |                    | 3,500  |   |   |   | - |   |
| Accrued      liabilities                                |   |                    | 2,534  |   |   |   | 2,984 |   |
| Depreciation      and amortization                      |   |                    | 1,302  |   |   |   | 1,188 |   |
| Stock      compensation                                 |   |                    | 1,080  |   |   |   | 425 |   |
| Deferred      revenue on shipments to distributors      |   |                    | 739    |   |   |   | 1,693 |   |
| Allowances      for doubtful accounts and sales returns |   |                    | 300    |   |   |   | 419 |   |
| Accrued      employee benefits                          |   |                    | 108    |   |   |   | 1,413 |   |
| Other                                                   |   |                    | 843    |   |   |   | 907 |   |
| Total      deferred tax assets                          |   | $                       | 14,351 |   |   | $ | 11,922 |   |

|                                                                                        |   | Fiscal      Years Ended |   |
|---------------------------------------------------------------------------------------------|--------|-------------------------|--------|
|                                                                                        |   | March      28, 2009     |   |   | March      29, 2008 |   |
| Beginning      balance                                                                      |   | $                       | 3,941  |   |   | $ | 4,713 |   |
| Increases      (decreases) of unrecognized tax benefits related to prior years'      UTB    |   |                    | 634    |   |   |   | 64 |   |
| Increases      (decreases) of unrecognized tax benefits related to current year's      UTB  |   |                    | 803    |   |   |   | 552 |   |
| Increases      (decreases) of unrecognized tax benefits related to      settlements         |   |                    | (648   | ) |   |   | (1,021 | ) |
| Reductions      to unrecognized tax benefits related to lapsing statute of      limitations |   |                    | (511   | ) |   |   | (367 | ) |
| Ending      balance                                                                         |   | $                       | 4,219  |   |   | $ | 3,941 |   |

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|                                                   |   | March      28, 2009 |   |   |   | March      29, 2008 |   |   |
|--------------------------------------------------------|--------|---------------------|--------|--------|--------|---------------------|--------|--------|
| Net      income                                        |   | $                   | 12,545 |   |   |                | $      | 17,005 |   |   |
| Unrealized      loss on available-for-sale investments |   |                | (4,925 | )      |   |                |   | (4,069 | ) | (1) |
| Deferred      income taxes                             |   |                | 3,500  |   | (2)    |                |   | -      |   |   |
| Comprehensive      income                              |   | $                   | 11,120 |   |   |                | $      | 12,936 |   |   |

|                              |   | Fiscal      Years Ended |   |
|-----------------------------------|--------|-------------------------|--------|
|                              |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Number      of shares repurchased |   |                    | -      |   |   |   | 1,173,000 |   |   |   | 55,000 |   |
| Cost      of shares repurchased   |   | $                       | -      |   |   | $ | 27,371,000 |   |   | $ | 1,853,000 |   |
| Average      price per share      |   | $                       | -      |   |   | $ | 23.33 |   |   | $ | 33.70 |   |

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|                         |   |                     |    |   | Options      Outstanding |   |
|------------------------------|--------|--------------------------|---------|--------|--------------------------|--------|
|                         |   | Available      For Grant |    |   | Shares                   |   |   | Price      Per Share |   |   | Weighted      Average Exercise Price |   |
| Balance,      April 1, 2006  |   |                     | -       |   |                     |   | 334,890 |   |   |  $ | 10.75 | - | $  | 46.34 |   |   | $ | 22.80 |   |
| Exercised                    |   |                     | -       |   |                     |   | (116,890 | ) |   |   | 12.53 | - |   | 46.34 |   |   |   | 20.21 |   |
| Canceled                     |   |                     | 1,500   |   |                     |   | (1,500 | ) |   |   | 46.34 | - |   | 46.34 |   |   |   | 46.34 |   |
| Expired                      |   |                     | (1,500  | )      |                     |   | - |   |   |   | 46.34 | - |   | 46.34 |   |   |   | 46.34 |   |
| Balance,      March 31, 2007 |   |                     | -       |   |                     |   | 216,500 |   |   |   | 10.75 | - |   | 46.34 |   |   |   | 24.04 |   |
| Exercised                    |   |                     | -       |   |                     |   | (66,000 | ) |   |   | 10.75 | - |   | 19.56 |   |   |   | 14.34 |   |
| Canceled                     |   |                     | 72,500  |   |                     |   | (72,500 | ) |   |   | 46.34 | - |   | 46.34 |   |   |   | 46.34 |   |
| Expired                      |   |                     | (72,500 | )      |                     |   | - |   |   |   | 46.34 | - |   | 46.34 |   |   |   | 46.34 |   |
| Balance,      March 29, 2008 |   |                     | -       |   |                     |   | 78,000 |   |   |   | 10.75 | - |   | 12.53 |   |   |   | 11.50 |   |
| Exercised                    |   |                     | -       |   |                     |   | (78,000 | ) |   |  $ | 10.75 | - | $  | 12.53 |   |   | $ | 11.50 |   |
| Canceled                     |   |                     | -       |   |                     |   | - |   |   |   |   |   |   |   |   |   |   |   |   |
| Expired                      |   |                     | -       |   |                     |   | - |   |   |   |   |   |   |   |   |   |   |   |   |
| Balance,      March 28, 2009 |   |                     | -       |   |                     |   | - |   |   |   |   |   |   |   |   |   |   |   |   |

|                         |   |                     |      |   | Options      Outstanding |   |
|------------------------------|--------|--------------------------|-----------|--------|--------------------------|--------|
|                         |   | Available      For Grant |      |   | Shares                   |   |   | Price      Per Share |   |   | Weighted      Average Exercise Price |   |
| Balance,      April 1, 2006  |   |                     | 1,051,669 |   |                     |   | 782,329 |   |   | $ | 11.30 | - |   | $ | 42.24 |   |   | $ | 22.77 |   |
| Granted                      |   |                     | (226,650  | )      |                     |   | 226,650 |   |   |   | 35.37 | - |   |   | 46.92 |   |   |   | 41.52 |   |
| Exercised                    |   |                     | -         |   |                     |   | (112,549 | ) |   |   | 11.30 | - |   |   | 33.67 |   |   |   | 17.02 |   |
| Canceled                     |   |                     | 60,560    |   |                     |   | (60,560 | ) |   |   | 17.34 | - |   |   | 42.24 |   |   |   | 32.82 |   |
| Balance,      March 31, 2007 |   |                     | 885,579   |   |                     |   | 835,870 |   |   |   | 11.30 | - |   |   | 46.92 |   |   |   | 27.90 |   |
| Granted                      |   |                     | (307,700  | )      |                     |   | 307,700 |   |   |   | 20.70 | - |   |   | 35.86 |   |   |   | 32.71 |   |
| Exercised                    |   |                     | -         |   |                     |   | (56,505 | ) |   |   | 11.30 | - |   |   | 33.67 |   |   |   | 19.56 |   |
| Canceled                     |   |                     | 64,700    |   |                     |   | (64,700 | ) |   |   | 11.30 | - |   |   | 41.05 |   |   |   | 35.13 |   |
| Balance,      March 29, 2008 |   |                     | 642,579   |   |                     |   | 1,022,365 |   |   |   | 11.30 | - |   |   | 46.92 |   |   |   | 29.35 |   |
| Granted                      |   |                     | (597,500  | )      |                     |   | 597,500 |   |   |   | 20.85 | - |   |   | 29.70 |   |   |   | 23.13 |   |
| Exercised                    |   |                     | -         |   |                     |   | (37,000 | ) |   |   | 11.30 | - |   |   | 21.75 |   |   |   | 16.39 |   |
| Canceled                     |   |                     | 115,030   |   |                     |   | (115,030 | ) |   |   | 15.67 | - |   |   | 46.92 |   |   |   | 31.95 |   |
| Balance,      March 28, 2009 |   |                     | 160,109   |   |                     |   | 1,467,835 |   |   | $ | 11.30 | - |   | $ | 46.92 |   |   | $ | 26.94 |   |

----

Table ofContents

|                          |   |   |                    |   |   |                                                     | Options      Outstanding |   |                                 | Options      Exercisable |   |
|-------------------------------|--------|--------|-------------------------|--------|--------|----------------------------------------------------------|--------------------------|--------|--------------------------------------|--------------------------|--------|
| Range      of Exercise Prices |   |   | Number      Outstanding |   |   | Weighted-Average      Remaining Contractual Life (Years) |                     |   | Weighted-Average      Exercise Price |                     |   | Number      Exercisable |   |   | Weighted-Average      Exercise Price |   |
| $                             | 11.30  |   | -                       |   | $      | 14.99                                                    |                     |   |                                 | 18,475                   |   |   |   | 0.44 |   |   | $ | 11.93 |   |   |   | 18,475 |   |   | $ | 11.93 |   |
|                          | 15.00  |   | -                       |   |   | 19.99                                                    |                     |   |                                 | 244,500                  |   |   |   | 2.12 |   |   |   | 17.29 |   |   |   | 198,880 |   |   |   | 17.32 |   |
|                          | 20.00  |   | -                       |   |   | 24.99                                                    |                     |   |                                 | 428,500                  |   |   |   | 9.32 |   |   |   | 20.88 |   |   |   | 20,820 |   |   |   | 21.42 |   |
|                          | 25.00  |   | -                       |   |   | 29.99                                                    |                     |   |                                 | 235,600                  |   |   |   | 8.84 |   |   |   | 27.15 |   |   |   | 12,700 |   |   |   | 29.17 |   |
|                          | 30.00  |   | -                       |   |   | 34.99                                                    |                     |   |                                 | 272,260                  |   |   |   | 5.58 |   |   |   | 33.77 |   |   |   | 110,185 |   |   |   | 33.72 |   |
|                          | 35.00  |   | -                       |   |   | 39.99                                                    |                     |   |                                 | 104,300                  |   |   |   | 8.25 |   |   |   | 35.84 |   |   |   | 24,860 |   |   |   | 35.82 |   |
|                          | 40.00  |   | -                       |   |   | 44.99                                                    |                     |   |                                 | 146,200                  |   |   |   | 4.61 |   |   |   | 40.90 |   |   |   | 59,420 |   |   |   | 40.92 |   |
|                          | 45.00  |   | -                       |   |   | 46.92                                                    |                     |   |                                 | 18,000                   |   |   |   | 4.68 |   |   |   | 49.92 |   |   |   | 7,200 |   |   |   | 46.92 |   |
| $                             | 11.30  |   | -                       |   | $      | 46.92                                                    |                     |   |                                 | 1,467,835                |   |   |   | 6.64 |   |   | $ | 26.94 |   |   |   | 452,540 |   |   | $ | 26.20 |   |

|                                              |   | Fiscal      Years Ended |   |
|---------------------------------------------------|--------|-------------------------|--------|
|                                              |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Cost      of sales                                |   | $                       | 558    |   |   | $ | 567 |   |   | $ | 302 |   |
| Research      and development expenses            |   |                    | 1236   |   |   |   | 1,053 |   |   |   | 1,382 |   |
| Selling,      general and administrative expenses |   |                    | 967    |   |   |   | 925 |   |   |   | 735 |   |
| Total      stock-based compensation expense       |   | $                       | 2,761  |   |   | $ | 2,545 |   |   | $ | 2,419 |   |

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Table ofContents

|                                |   | Fiscal      Years Ended       |                |
|-------------------------------------|--------|-------------------------------|---------------------|
|                                |   | March      28, 2009           |                |   | March      29, 2008 |   |
|                                |   | Directors &      Officers |                |   | All      Other Employees |   |   | Directors &      Officers |   |   | All      Other Employees |   |
| Expected      term (years)          |   |                          | 7.75                |   |   |   | 5.25 |   |   |   | 7.25 |   |   |   | 4.25      - 5.25 |   |
| Stock      volatility               |   |                          | 50.81%      - 52.81 | % |   |   | 46.09%      - 47.33 | % |   |   | 55.6%      - 56.5 | % |   |   | 45.64%      - 47.05 | % |
| Risk      free interest rates       |   |                          | 2.28%      - 3.46   | % |   |   | 1.76%      - 3.32 | % |   |   | 3.56%      - 4.50 | % |   |   | 2.54%      - 4.93 | % |
| Dividends      during expected term |   |                          | 0.0                 | % |   |   | 0.0 | % |   |   | 0.0 | % |   |   | 0.0 | % |

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| (in      thousands, except per share value)                           |   | Fiscal      Years Ended |   |
|-----------------------------------------------------------------------|--------|-------------------------|--------|
|                                                                  |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Net      income                                                       |   | $                       | 12,545 |   |   | $ | 17,005 |   |   | $ | 21,427 |   |
| BASIC:                                                                |   |                    |   |   |   |   |   |   |   |   |   |   |
| Weighted      average shares outstanding                              |   |                    | 12,836 |   |   |   | 13,585 |   |   |   | 13,715 |   |
| Net      income per share                                             |   | $                       | 0.98   |   |   | $ | 1.25 |   |   | $ | 1.56 |   |
|                                                                  |   |                    |   |   |   |   |   |   |   |   |   |   |
| DILUTED:                                                              |   |                    |   |   |   |   |   |   |   |   |   |   |
| Weighted      average shares outstanding                              |   |                    | 12,836 |   |   |   | 13,585 |   |   |   | 13,715 |   |
| Effect      of dilutive securities:  stock options and ESPP |   |                    | 91     |   |   |   | 205 |   |   |   | 325 |   |
|       Total                             |   |                    | 12,927 |   |   |   | 13,790 |   |   |   | 14,040 |   |
| Net      income per share                                             |   | $                       | 0.97   |   |   | $ | 1.23 |   |   | $ | 1.53 |   |

|                     |   | Fiscal      Years Ended |   |
|--------------------------|--------|-------------------------|--------|
| Net      Sales           |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| Medical      Electronics |   | $                       | 33,368 |   |   | $ | 30,381 |   |   | $ | 29,336 |   |
| Imaging                  |   |                    | 20,550 |   |   |   | 26,473 |   |   |   | 42,241 |   |
| Industrial/Other         |   |                    | 12,780 |   |   |   | 13,119 |   |   |   | 17,654 |   |
| Telecom                  |   |                    | 7,139  |   |   |   | 8,715 |   |   |   | 7,377 |   |
| LED      Lighting        |   |                    | 4,973  |   |   |   | 3,871 |   |   |   | 1,412 |   |
| Net      Sales           |   | $                       | 78,810 |   |   | $ | 82,559 |   |   | $ | 98,020 |   |

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|                        |   | Fiscal      Years Ended |   |
|-----------------------------|--------|-------------------------|--------|
| Net      Sales              |   | March      28, 2009     |   |   | March      29, 2008 |   |   | March      31, 2007 |   |
| United      States          |   | $                       | 29,301 |   |   | $ | 30,162 |   |   | $ | 29,265 |   |
| Asia      (excluding China) |   |                    | 20,670 |   |   |   | 21,645 |   |   |   | 23,069 |   |
| China                       |   |                    | 17,968 |   |   |   | 18,903 |   |   |   | 32,449 |   |
| Europe                      |   |                    | 10,093 |   |   |   | 11,005 |   |   |   | 11,834 |   |
| Other                       |   |                    | 778    |   |   |   | 844 |   |   |   | 1,403 |   |
| Total      Net Sales        |   | $                       | 78,810 |   |   | $ | 82,559 |   |   | $ | 98,020 |   |

|                                                |   | March      28, 2009 |   |   | March      29, 2008 |   |
|-----------------------------------------------------|--------|---------------------|--------|--------|---------------------|--------|
| United      States                                  |   | $                   | 6,952  |   |                | $      | 8,334 |   |
| Hong      Kong                                      |   |                | 1,521  |   |                |   | 1,582 |   |
|   Property,      plant and equipment, net |   | $                   | 8,473  |   |                | $      | 9,916 |   |

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| Payment      Due by Fiscal Years |   | Operating      Lease |   |   | Sublease      Income |   |
|----------------------------------|--------|----------------------|--------|--------|----------------------|--------|
| 2010                             |   | $                    | 1,132  |   |                 | $      | 11 |   |
| 2011                             |   |                 | 1,041  |   |                 |   | - |   |
| 2012                             |   |                 | 102    |   |                 |   | - |   |
|        Total                |   | $                    | 2,275  |   |                 | $      | 11 |   |

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SUPERTEX, INC.

| Exhibit                         | Exhibit      Description                                                                                                                                                                                                                    |
|---------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                            |                                                                                                                                                                                                                                        |
| 2.1      (1)                    | Agreement      for purchases and sale of assets by and between Supertex, Inc. and Orbit      Semiconductor dated January 16, 1999.                                                                                                          |
|                            |                                                                                                                                                                                                                                        |
| 3.1      (2)                    | Restated      Articles of Incorporation of Registrant filed May 21,  1980.                                                                                                                                                                  |
|                            |                                                                                                                                                                                                                                        |
| 3.2      (2)                    | Certificate      of Amendment of Articles of Incorporation filed April 16,      1981.                                                                                                                                                       |
|                            |                                                                                                                                                                                                                                        |
| 3.3      (2)                    | Certificate      of Amendment of Articles of Incorporation filed September 30,      1983.                                                                                                                                                   |
|                            |                                                                                                                                                                                                                                        |
| 3.4      (3)                    | Certificate      of Amendment of Articles of Incorporation filed October 14,      1988.                                                                                                                                                     |
|                            |                                                                                                                                                                                                                                        |
| 3.5      (5)                    | Bylaws      of Registrant, as amended.                                                                                                                                                                                                      |
|                            |                                                                                                                                                                                                                                        |
| 10      (2)                     | Deferred      Compensation Plan, which became effective January 1,  1996.                                                                                                                                                                   |
|                            |                                                                                                                                                                                                                                        |
| 10.2      (1)                   | Lease      Assignment agreement for 71 Vista Montana, San Jose, California, dated      February 1, 1999 among Orbit Semiconductor, as      assignor, Sobrato Development Companies #871, as landlord, and Supertex,      Inc., as assignee. |
|                            |                                                                                                                                                                                                                                        |
| 10.6      (4)    | 1991      Stock Option Plan which became effective, with form of stock option      agreement.                                                                                                                                               |
|                            |                                                                                                                                                                                                                                        |
| 10.6a      (5)                  | 1991      Stock Option Plan, as amended as of August 4, 1995, with form of stock      option agreement.                                                                                                                                     |
|                            |                                                                                                                                                                                                                                        |
| 10.6b      (6)                  | 1991      Stock Option Plan, as amended as of August 6, 1999, with form of stock      option agreement.                                                                                                                                     |
|                            |                                                                                                                                                                                                                                        |
| 10.6c      (7)        | 2000      Employee Stock Purchase Plan.                                                                                                                                                                                                     |
|                            |                                                                                                                                                                                                                                        |
| 10.6d      (8)                  | 2001      Stock Option Plan, which became effective, with form of stock option      agreement.                                                                                                                                              |
|                            |                                                                                                                                                                                                                                        |
| 10.7      (2)                   | Profit      Sharing Plan.                                                                                                                                                                                                                   |

|                                                                                     |                                                                                                                                                                                             |
|------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 21.1                                                                                     | Subsidiary      of the Registrant.                                                                                                                                                               |
|                                                                                     |                                                                                                                                                                                             |
| 23.1               | Consent      of PricewaterhouseCoopers LLP, Independent Registered Public Accounting      Firm.                                                                                                  |
|                                                                                     |                                                                                                                                                                                             |
| 24.1                                                                                     | Power      of Attorney (See signature page).                                                                                                                                                     |
|                                                                                     |                                                                                                                                                                                             |
| 31.1                                                                                     | Certification      of Chief Executive Officer pursuant to Securities Exchange Act Rules      13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the      Sarbanes-Oxley Act of 2002. |
|                                                                                     |                                                                                                                                                                                             |
| 31.2                                                                                     | Certification      of Chief Financial Officer pursuant to Securities Exchange Act Rules      13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the      Sarbanes-Oxley Act of 2002. |
|                                                                                     |                                                                                                                                                                                             |
| 32.1                                                                                     | Certification      of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted      pursuant to Section 906 of the Sarbanes-Oxley Act of  2002.                                    |
|                                                                                     |                                                                                                                                                                                             |
| 32.2                                                                                     | Certification      of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted      pursuant to Section 906 of the Sarbanes-Oxley Act of  2002.                                    |

----

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| (1) | Incorporated      by reference to the exhibit of the same number filed with current report      on form 8-K dated January 19, 1999. |
|-----|-------------------------------------------------------------------------------------------------------------------------------------|

| (2) | Incorporated      by reference to exhibit of same number of Registrant's Registration      Statement on Form S-1 (File No. 2-86898), which became effective December      6, 1983. |
|-----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (3) | Incorporated      by reference to exhibit filed with Quarterly Report on Form 10-Q for      period ended October 1, 1988. |
|-----|---------------------------------------------------------------------------------------------------------------------------|

| (4) | Incorporated      by reference to exhibit filed with Annual Report on Form 10-K for year      ended March 31, 1991. |
|-----|---------------------------------------------------------------------------------------------------------------------|

| (5) | Incorporated      by reference to exhibit included in Registrant's Registration Statement on      Form S-8 (File No. 33-43691) which became effective September 1,      1995. |
|-----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (6) | Incorporated      by reference to exhibit included in Registrant's  Registration      Statement on Form S-8 (File No. 33-43691) which became effective September      29, 1999. |
|-----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (7) | Incorporated      by reference to exhibit included in Registrant's  Registration      Statement on Form S-8 (File No. 333-47606) which became effective October      6, 2000. |
|-----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (8) | Incorporated      by reference to Appendix B of the Registrants amended Proxy Statement      filed on August 7, 2001 (File No. 000-12718).  Corresponding      Registration Statement on Form S-8 (File No. 333-69594) became effective      on September 18, 2001. |
|-----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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Table ofContents

| Name                  | Jurisdiction      of Incorporation | Year      Organized |
|-----------------------|------------------------------------|---------------------|
| Supertex      Limited | Hong      Kong                     | 2001                |

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----

Table of Contents

| 1. | I      have reviewed this annual report on Form 10-K of Supertex, Inc., a      California corporation; |
|----|--------------------------------------------------------------------------------------------------------|

| 2. | Based      on my knowledge, this annual report does not contain any untrue statement      of a material fact or omit to state a material fact necessary to make the      statements made, in light of the circumstances under which such statements      were made, not misleading with respect to the period covered by this      annual report; |
|----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 3. | Based      on my knowledge, the financial statements, and other financial information      included in this annual report, fairly present in all material respects      the financial condition, results of operations and cash flows of the      registrant as of, and for, the periods presented in this annual      report; |
|----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 4. | The      Registrant’s other certifying officer and I are responsible for      establishing and maintaining disclosure controls and procedures (as      defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal      control over financial reporting (as defined in Exchange Act Rules      13a-15(f) and 15d-15(f) for the registrant and  have: |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (a)   | designed      such disclosure controls and procedures, or caused such disclosure      controls and procedures to be designed under our supervision, to ensure      that material information relating to the registrant, including its      consolidated subsidiaries, is made known to us by others within those      entities, particularly during the period in which this annual report is      being prepared; |
|-----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (b)        | designed      such internal control over financial reporting, or caused such internal      control over financial reporting to be designed under our supervision, to      provide reasonable assurance regarding the reliability of financial      reporting and the preparation of financial statements for external      purposes in accordance with generally accepted accounting      principles; |
|-----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (c)   | evaluated      the effectiveness of the registrant's disclosure controls and procedures      and presented in this report our conclusion about the effectiveness of the      disclosure controls and procedures, as of the end of the period covered by      this annual report based on such evaluation;and |
|-----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (d)   | disclosed      in this report any change in the registrant’s internal control over      financial reporting that occurred during the registrant’s fourth fiscal      quarter that has materially affected, or is reasonably likely to      materially affect, the registrant’s internal control over financial      reporting; and |
|-----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 5. | The      Registrant’s other certifying officer and I have disclosed, based on our      most recent evaluation of internal control over financial reporting, to      the registrant's auditors and the audit committee of registrant's board of      directors (or persons performing the equivalent  function): |
|----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (a)   | all      significant deficiencies and material weaknesses in the design or      operation of internal control over financial reporting which are      reasonably likely to adversely affect the registrant's ability to record,      process, summarize, and report financial information;  and |
|-----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (b)   | any      fraud, whether or not material, that involves management or other      employees who have a significant role in the registrant's internal control      over financial reporting. |
|-----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Dated:  June      8, 2009 |   |   | /s/ HENRY C.      PAO                        |
|-------------------------------------|--------|--------|----------------------------------------------|
|                                |   |   | Henry      C. Pao, Ph.D.                     |
|                                |   |   | President      & Chief Executive Officer |
|                                |   |   | (Principal      Executive Officer)           |

----

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| 1. | I      have reviewed this annual report on Form 10-K of Supertex, Inc., a      California corporation; |
|----|--------------------------------------------------------------------------------------------------------|

| 2. | Based      on my knowledge, this annual report does not contain any untrue statement      of a material fact or omit to state a material fact necessary to make the      statements made, in light of the circumstances under which such statements      were made, not misleading with respect to the period covered by this      annual report; |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 3. | Based      on my knowledge, the financial statements, and other financial information      included in this annual report, fairly present in all material respects      the financial condition, results of operations and cash flows of the      registrant as of, and for, the periods presented in this annual      report; |
|----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 4. | The      Registrant’s other officer and I are responsible for establishing and      maintaining disclosure controls and procedures (as defined in Exchange Act      Rules 13a-15(e) and 15d-15(e)) and internal control over financial      reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for      the registrant and have: |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (a)   | designed      such disclosure controls and procedures, or caused such disclosure      controls and procedures to be designed under our supervision, to ensure      that material information relating to the registrant, including its      consolidated subsidiaries, is made known to us by others within those      entities, particularly during the period in which this annual report is      being prepared; |
|-----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (b)   | designed      such internal control over financial reporting, or caused such internal      control over financial reporting to be designed under our supervision, to      provide reasonable assurance regarding the reliability of financial      reporting and the preparation of financial statements for external      purposes in accordance with generally accepted accounting      principles; |
|-----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (c)   | evaluated      the effectiveness of the registrant's disclosure controls and procedures      and presented in this report our conclusion about the effectiveness of the      disclosure controls and procedures, as of the end of the period covered by      this annual report based on such evaluation;and |
|-----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (d)   | disclosed      in this report any change in the registrant’s internal control over      financial reporting that occurred during the registrant’s fourth fiscal      quarter that has materially affected, or is reasonably likely to      materially affect, the registrant’s internal control over financial      reporting; and |
|-----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 5. | The      Registrant’s other officer and I have disclosed, based on our most recent      evaluation of internal control over financial reporting, to the      registrant's auditors and the audit committee of registrant's board of      directors (or persons performing the equivalent  function): |
|----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (a)   | all      significant deficiencies and material weaknesses in the design or      operation of internal control over financial reporting which are      reasonably likely to adversely affect the registrant's ability to record,      process, summarize, and report financial information;  and |
|-----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (b)   | any      fraud, whether or not material, that involves management or other      employees who have a significant role in the registrant's internal control      over financial reporting. |
|-----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Dated:  June      8, 2009 |   |   | /s/ PHILLIP A.      KAGEL                                |
|-------------------------------------|--------|--------|----------------------------------------------------------|
|                                |   |   | Phillip      A. Kagel                                    |
|                                |   |   | Vice      President, Finance and Chief Financial Officer |
|                                |   |   | (Principal      Financial and Accounting Officer)        |

----

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|   | (i) | the      Annual Report of the Company on Form 10-K for the period ending March      28, 2009 (the “Report”), fully complies with the requirements of Section      13(a) or 15(d), whichever is applicable, of the Securities Exchange Act of      1934, and |
|--------|-----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (ii) | the      information contained in the Report fairly presents, in all material      respects, the financial condition and results of operations of the      Company. |
|--------|------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Dated:  June      8, 2009 |   |   | /s/      HENRY C. PAO                                   |
|-------------------------------------|--------|--------|---------------------------------------------------------|
|                                |   |   | Henry      C. Pao, Ph.D.                                |
|                                |   |   | President  &      Chief Executive Officer |
|                                |   |   | (Principal      Executive Officer)                      |

----

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|   | (i) | the      Annual Report of the Company on Form 10-K for the period ending March      28, 2009 (the “Report”), fully complies with the requirements of Section      13(a) or 15(d), whichever is applicable, of the Securities Exchange Act of      1934, and |
|--------|-----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (ii) | the      information contained in the Report fairly presents, in all material      respects, the financial condition and results of operations of the      Company. |
|--------|------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Dated:  June      8, 2009 |   |   | /s/      PHILLIP A. KAGEL                                |
|-------------------------------------|--------|--------|----------------------------------------------------------|
|                                |   |   | Phillip      A. Kagel                                    |
|                                |   |   | Vice      President, Finance and Chief Financial Officer |
|                                |   |   | (Principal      Financial and Accounting Officer)        |

| The      material contained in this Exhibit 32.2 is not deemed “filed” with the SEC      and is not to be incorporated by reference into any filing of the Company      under the Securities Act of 1933 or the Securities Exchange Act of 1934,      whether made before or after the date hereof and irrespective of any      general incorporation language contained in such  filing. |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----