| **                            UNITED STATES****SECURITIES                AND EXCHANGE COMMISSION**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Washington,                D.C.  20549                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **FORM                10-Q**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| (MARK                ONE)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| (x)    Quarterly                Report Pursuant to Section 13 or 15(d) of the Securities Exchange                Act of                1934                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **For                the quarterly period ended December 29, 2007**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| or                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| (  )   Transition                Report Pursuant to Section 13 or 15(d) of the Securities and Exchange                Act                of 1934    (No Fee Required)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| **Commission                File No. 0-12718**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| **SUPERTEX,                INC.**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| (Exact                name of Registrant as specified in its Charter)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |
| **California**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | **94-2328535** |
| (State                or other jurisdiction of incorporation or organization)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | (IRS                Employer Identification #) |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |
| **1235                Bordeaux Drive**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| **Sunnyvale,                California 94089**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| (Address                of principal executive offices)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Registrant's                Telephone Number, Including Area Code:  **(408)                222-8888**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| 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  [    ]** |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |
| 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                [   ]            Accelerated                filer [ X                ]                 Non-accelerated                filer [   ]**                                                                                                              |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |
| Indicate                by check mark whether the registrant is a shell company (as defined                in                Rule 12b-2 of the Act).**Yes  [   ]                                                                                No  [                X ]** |
| Indicate                the number of shares outstanding of each of the issuer’s classes of common                stock, as of the latest practicable date.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |
| Class                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | Outstanding                at February 5, 2008 |
| Common                Stock, no par value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 12,873,082 |
| *Exhibit                index is on Page 30*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| *Total                number of pages: 34*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |

----

**SUPERTEX,      INC.**

**QUARTERLY      REPORT - FORM 10Q**

| Table                of Contents |                                                                                                                      |   | Page                No. |   |
|----------------------------------|---------------------------------------------------------------------------------------------------------------------------|--------|-------------------------|--------|
|                             | PART                I – FINANCIAL INFORMATION                                                                       |   |                    |   |
| Item                1.           | Financial                Statements (Unaudited)                                                                           |   |                    |   |
|                             | Condensed                Consolidated Statements of Income                                                                |   |                    | 3      |   |
|                             | Condensed                Consolidated Balance Sheets                                                                      |   |                    | 4      |   |
|                             | Condensed                Consolidated Statements of Cash Flows                                                            |   |                    | 5      |   |
|                             | Notes                to Condensed Consolidated Financial Statements                                                       |   |                    | 6      |   |
| Item                2.           | Management’s                Discussion and Analysis of Financial Condition and Results of                Operations |   |                    | 16     |   |
| Item                3.           | Quantitative                and Qualitative Disclosures About Market Risk                                                 |   |                    | 27     |   |
| Item                4.           | Controls                and Procedures                                                                                    |   |                    | 27     |   |
|                             |                                                                                                                      |   |                    |   |   |
|                             | PART                II – OTHER INFORMATION                                                                          |   |                    |   |   |
| Item                1.           | Legal                Proceedings                                                                                          |   |                    | 29     |   |
| Item                1A.          | Risk                Factors                                                                                               |   |                    | 29     |   |
| Item                2.           | Unregistered                Sales of Equity Securities and Use of Proceeds                                                |   |                    | 29     |   |
| Item                3.           | Defaults                Upon Senior Securities                                                                            |   |                    | 30     |   |
| Item                4.           | Submission                of Matters to a Vote of Security Holders                                                        |   |                    | 30     |   |
| Item                5.           | Other                Information                                                                                          |   |                    | 30     |   |
| Item                6.           | Exhibits                                                                                                                  |   |                    | 30     |   |
|                             |                                                                                                                      |   |                    |   |   |
| Signature                        |                                                                                                                      |   |                    | 31     |   |

----

**PART      I - FINANCIAL INFORMATION**

**Item      1.  Financial Statements**

**SUPERTEX,      INC.**

**CONDENSED      CONSOLIDATED STATEMENTS OF INCOME**

*(unaudited)*

*(in      thousands, except per share amounts)*

|                                                                                                                                                |   | **Three                Months Ended** |   |   | **Nine                Months Ended** |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------------|--------|--------|--------------------------------------|--------|
|                                                                                                                                                |   | **December                29, 2007**  |   |   | **December                30, 2006** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |
| Net                sales                                                                                                                            |   | $                                     | 20,147 |   |                                 | $      | 24,098 |   |   | $ | 62,938 |   |   | $ | 75,184 |   |
| Cost                of sales(1)                                                                                                                     |   |                                  | 8,915  |   |                                 |   | 9,860 |   |   |   | 26,011 |   |   |   | 30,002 |   |
| Gross                profit                                                                                                                         |   |                                  | 11,232 |   |                                 |   | 14,238 |   |   |   | 36,927 |   |   |   | 45,182 |   |
| Research                and development(1)                                                                                                          |   |                                  | 3,358  |   |                                 |   | 3,688 |   |   |   | 10,981 |   |   |   | 11,295 |   |
| Selling,                general and administrative(1)                                                                                               |   |                                  | 3,888  |   |                                 |   | 4,152 |   |   |   | 11,726 |   |   |   | 11,781 |   |
| Total                operating expenses                                                                                                             |   |                                  | 7,246  |   |                                 |   | 7,840 |   |   |   | 22,707 |   |   |   | 23,076 |   |
| Income                from operations                                                                                                               |   |                                  | 3,986  |   |                                 |   | 6,398 |   |   |   | 14,220 |   |   |   | 22,106 |   |
| Interest                income                                                                                                                      |   |                                  | 1,664  |   |                                 |   | 1,263 |   |   |   | 4,485 |   |   |   | 3,576 |   |
| Other                income (expense), net                                                                                                          |   |                                  | (332   | )      |                                 |   | 387 |   |   |   | (59 | ) |   |   | 330 |   |
| Income                before provision for income taxes                                                                                             |   |                                  | 5,318  |   |                                 |   | 8,048 |   |   |   | 18,646 |   |   |   | 26,012 |   |
| Provision                for income taxes                                                                                                           |   |                                  | 1,641  |   |                                 |   | 2,555 |   |   |   | 5,995 |   |   |   | 9,607 |   |
| Net                income                                                                                                                           |   | $                                     | 3,677  |   |                                 | $      | 5,493 |   |   | $ | 12,651 |   |   | $ | 16,405 |   |
| Net                income per share:                                                                                                                |   |                                  |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |
| Basic                                                                                                                                               |   | $                                     | 0.27   |   |                                 | $      | 0.40 |   |   | $ | 0.92 |   |   | $ | 1.20 |   |
| Diluted                                                                                                                                             |   | $                                     | 0.26   |   |                                 | $      | 0.39 |   |   | $ | 0.91 |   |   | $ | 1.17 |   |
|                                                                                                                                                |   |                                  |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |
| Shares                used in per share computation:                                                                                                |   |                                  |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |
| Basic                                                                                                                                               |   |                                  | 13,685 |   |                                 |   | 13,749 |   |   |   | 13,700 |   |   |   | 13,688 |   |
| Diluted                                                                                                                                             |   |                                  | 13,912 |   |                                 |   | 14,082 |   |   |   | 13,929 |   |   |   | 14,029 |   |
|                                                                                                                                                |   |                                  |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |
| (1)Includes                amortization of employee stock-based compensation as                follows.  See Note 2 for more information: |   |                                  |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |
| Cost                of sales                                                                                                                        |   | $                                     | 127    |   |                                 | $      | 91 |   |   | $ | 401 |   |   | $ | 248 |   |
| Research                and development                                                                                                             |   | $                                     | 198    |   |                                 | $      | 416 |   |   | $ | 663 |   |   | $ | 1,199 |   |
| Selling,                general and administrative                                                                                                  |   | $                                     | 210    |   |                                 | $      | 216 |   |   | $ | 631 |   |   | $ | 575 |   |

*See      accompanying Notes to Unaudited Condensed Consolidated Financial      Statements.*

----

**SUPERTEX,      INC.**

**CONDENSED      CONSOLIDATED BALANCE SHEETS**

*(unaudited,      in thousands)*

|                                                                                                                                         |   | **December                29, 2007** |    |   | **March                31, 2007** |   |
|----------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------------------------------|---------|--------|-----------------------------------|--------|
| **ASSETS**                                                                                                                                   |   |                                 |    |   |                              |   |
| Current                Assets:                                                                                                               |   |                                 |    |   |                              |   |
| Cash                and cash equivalents                                                                                                     |   | $                                    | 23,979  |   |                              | $      | 22,652 |   |
| Short-term                investments                                                                                                        |   |                                 | 117,719 |   |                              |   | 116,264 |   |
| Trade                accounts receivable                                                                                                     |   |                                 | 12,906  |   |                              |   | 12,793 |   |
| Inventories                                                                                                                                  |   |                                 | 17,511  |   |                              |   | 14,238 |   |
| Prepaid                expenses and other current assets                                                                                     |   |                                 | 2,180   |   |                              |   | 2,172 |   |
| Deferred                income taxes                                                                                                         |   |                                 | 8,123   |   |                              |   | 8,123 |   |
| Total                current assets                                                                                                          |   |                                 | 182,418 |   |                              |   | 176,242 |   |
| Property,                plant and equipment, net                                                                                            |   |                                 | 10,291  |   |                              |   | 8,651 |   |
| Other                assets                                                                                                                  |   |                                 | 389     |   |                              |   | 140 |   |
| Deferred                income taxes                                                                                                         |   |                                 | 1,568   |   |                              |   | 899 |   |
| **TOTAL                ASSETS**                                                                                                              |   | $                                    | 194,666 |   |                              | $      | 185,932 |   |
|                                                                                                                                         |   |                                 |    |   |                              |   |   |   |
|                                                                                                                                         |   |                                 |    |   |                              |   |   |   |
| **LIABILITIES                AND SHAREHOLDERS’ EQUITY**                                                                                |   |                                 |    |   |                              |   |   |   |
| Current                Liabilities:                                                                                                          |   |                                 |    |   |                              |   |   |   |
| Trade                accounts payable                                                                                                        |   | $                                    | 3,836   |   |                              | $      | 4,120 |   |
| Accrued                salaries and employee benefits                                                                                        |   |                                 | 12,270  |   |                              |   | 12,102 |   |
| Other                accrued liabilities                                                                                                     |   |                                 | 2,111   |   |                              |   | 2,175 |   |
| Deferred                revenue                                                                                                              |   |                                 | 3,688   |   |                              |   | 2,965 |   |
| Income                taxes payable                                                                                                          |   |                                 | --      |   |                              |   | 3,318 |   |
| Total                current liabilities                                                                                                     |   |                                 | 21,905  |   |                              |   | 24,680 |   |
| Income                taxes payable, noncurrent                                                                                              |   |                                 | 5,389   |   |                              |   | -- |   |
| TOTAL                LIABILITIES                                                                                                             |   | $                                    | 27,294  |   |                              | $      | 24,680 |   |
|                                                                                                                                         |   |                                 |    |   |                              |   |   |   |
| Commitments                and contingencies (Note 7)                                                                                        |   |                                 |    |   |                              |   |   |   |
|                                                                                                                                         |   |                                 |    |   |                              |   |   |   |
| 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                13,589 shares and 13,794 shares |   |                                 | 57,637  |   |                              |   | 54,741 |   |
| Retained                earnings                                                                                                             |   |                                 | 109,735 |   |                              |   | 106,511 |   |
| TOTAL                SHAREHOLDERS’ EQUITY                                                                                              |   |                                 | 167,372 |   |                              |   | 161,252 |   |
| **TOTAL                LIABILITIES AND SHAREHOLDERS’ EQUITY**                                                                          |   | $                                    | 194,666 |   |                              | $      | 185,932 |   |

*See      accompanying Notes to Unaudited Condensed Consolidated Financial      Statements.*

----

**SUPERTEX,      INC.**

**CONDENSED      CONSOLIDATED STATEMENTS OF CASH FLOWS**

*(unaudited,      in thousands)*

|                                                                                                               |   |    **Nine                Months Ended** |    |
|--------------------------------------------------------------------------------------------------------------------|--------|--------------------------------------------------------|---------|
| CASH                FLOWS FROM OPERATING ACTIVITIES                                                                |   | **December                29, 2007**                   |    |   | **December                30, 2006** |   |
|   Net                income                                                                              |   | $                                                      | 12,651  |   |   | $ | 16,405 |   |
|   Non-cash                adjustments to net income:                                                     |   |                                                   |    |   |   |   |   |   |
| Depreciation                                                                                                       |   |                                                   | 2,226   |   |   |   | 2,100 |   |
| Provision                for doubtful accounts and sales returns                                                   |   |                                                   | 1,064   |   |   |   | 774 |   |
| Provision                for excess and obsolete inventories                                                       |   |                                                   | 2,085   |   |   |   | 1,886 |   |
| Stock-based                compensation expense                                                                    |   |                                                   | 1,695   |   |   |   | 2,058 |   |
| Tax                benefit related to stock-based compensation plans                                               |   |                                                   | 462     |   |   |   | 1,454 |   |
| Excess                tax benefit related to stock-based compensation plans                                        |   |                                                   | (238    | ) |   |   | (966 | ) |
| Gain                on disposal of property, plant and equipment                                                   |   |                                                   | (200    | ) |   |   | - |   |
| Deferred                income taxes                                                                               |   |                                                   | (669    | ) |   |   | - |   |
| Changes                in operating assets and liabilities:                                                        |   |                                                   |    |   |   |   |   |   |
| Short-term                investments, categorized as trading                                                      |   |                                                   | (255    | ) |   |   | 262 |   |
| Trade                accounts receivable                                                                           |   |                                                   | (1,177  | ) |   |   | 455 |   |
| Inventories                                                                                                        |   |                                                   | (5,358  | ) |   |   | (2,458 | ) |
| Prepaid                expenses and other assets                                                                   |   |                                                   | (257    | ) |   |   | (780 | ) |
| Trade                accounts payable and accrued expenses                                                         |   |                                                   | (180    | ) |   |   | 1,083 |   |
| Deferred                revenue                                                                                    |   |                                                   | 723     |   |   |   | 606 |   |
| Income                taxes payable                                                                                |   |                                                   | 1,978   |   |   |   | (1,030 | ) |
| Net                cash provided by operating activities                                                           |   |                                                   | 14,550  |   |   |   | 21,849 |   |
| CASH                FLOWS FROM INVESTING ACTIVITIES                                                                |   |                                                   |    |   |   |   |   |   |
|   Purchases                of property, plant and equipment                                              |   |                                                   | (3,866  | ) |   |   | (2,292 | ) |
|   Proceeds                from disposal of property and equipment                                        |   |                                                   | 200     |   |   |   | - |   |
|   Purchases                of short-term investments, categorized as available for                sale   |   |                                                   | (87,900 | ) |   |   | (257,695 | ) |
|   Sales                of short-term investments, categorized as available for                sale       |   |                                                   | 86,700  |   |   |   | 231,195 |   |
| Net                cash used in investing activities                                                               |   |                                                   | (4,866  | ) |   |   | (28,792 | ) |
| CASH                FLOWS FROM FINANCING ACTIVITIES                                                                |   |                                                   |    |   |   |   |   |   |
|   Proceeds                from exercise of stock options and employee stock purchase                plan |   |                                                   | 2,033   |   |   |   | 4,273 |   |
|   Repurchase                of common stock                                                              |   |                                                   | (10,628 | ) |   |   | (1,107 | ) |
|   Excess                tax benefit related to stock-based compensation plans                            |   |                                                   | 238     |   |   |   | 966 |   |
| Net                cash provided by (used in) financing activities                                                 |   |                                                   | (8,357  | ) |   |   | 4,132 |   |
| NET                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                                |   |                                                   | 1,327   |   |   |   | (2,811 | ) |
| CASH                AND CASH EQUIVALENTS:                                                                          |   |                                                   |    |   |   |   |   |   |
| Beginning                of period                                                                                 |   |                                                   | 22,652  |   |   |   | 27,654 |   |
| End                of period                                                                                       |   | $                                                      | 23,979  |   |   | $ | 24,843 |   |
| Supplemental                cash flow disclosures:                                                                 |   |                                                   |    |   |   |   |   |   |
| Income                taxes paid, net of refunds                                                                   |   | $                                                      | 4,701   |   |   | $ | 9,661 |   |

*    See      accompanying Notes to Unaudited Condensed Consolidated Financial      Statements.*

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**SUPERTEX,            INC.**

**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS        **

**(unaudited)**

**Note      1 – Organization and Basis of Presentation**

*Reclassification*

*Recent      Accounting Pronouncements*

*Business        Combinations*

*Noncontrolling Interests in        Consolidated Financial Statements, an amendment of ARB No. 51*

----

**SUPERTEX,          INC.**
**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS         **

**(unaudited)**

*The Fair Value Option for Financial Assets and Financial Liabilities*

*Fair Value Measurements*

*Accounting for Uncertainty      in Income Taxes: An Interpretation of FASB statement No. 109 *

**Note      2 - Stock-Based Compensation**

*Share-Based Payment.*

|                                                          |   | **Three                Months Ended** |   |   | **Nine                Months Ended** |   |
|---------------------------------------------------------------|--------|---------------------------------------|--------|--------|--------------------------------------|--------|
|                                                          |   | **December                29, 2007**  |   |   | **December                30, 2006** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |
| Stock-based                compensation expense               |   | $                                     | 535    |   |                                 | $      | 723 |   |   | $ | 1,695 |   |   | $ | 2,022 |   |
| Tax                effect of stock-based compensation expense |   |                                  | (96    | )      |                                 |   | (48 | ) |   |   | (200 | ) |   |   | (65 | ) |
| Effect                on net income                           |   | $                                     | 439    |   |                                 | $      | 675 |   |   | $ | 1,495 |   |   | $ | 1,957 |   |

----

**SUPERTEX,          INC.**

**                  NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS                **

**(unaudited)    **

|                                      |   |                             |     |   | **Options                Outstanding** |   |
|-------------------------------------------|--------|----------------------------------|----------|--------|----------------------------------------|--------|
|                                      |   | **Available                For** |     |   | **Number                of**           |   |   | **Weighted                Average** |   |
|                                      |   | **Grant**                        |     |   | **Shares**                             |   |   | **Exercise                Price** |   |
| Balance,                March 31, 2007    |   |                             | 885,579  |   |                                   |   | 1,052,370 |   |   | $ | 27.08 |   |
|      Granted     |   |                             | (260,900 | )      |                                   |   | 260,900 |   |   |   | 34.87 |   |
|      Exercised   |   |                             | -        |   |                                   |   | (107,005 | ) |   |   | 17.44 |   |
|      Canceled    |   |                             | 108,800  |   |                                   |   | (108,800 | ) |   |   | 42.86 |   |
|  Expired                             |   |                             | (72,500  | )      |                                   |   | - |   |   |   | 46.34 |   |
| Balance,                December 29, 2007 |   |                             | 660,979  |   |                                   |   | 1,097,465 |   |   | $ | 28.33 |   |

----

**SUPERTEX,          INC.**
**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS         **

**(unaudited)**

|                                          |   |   |                                    |   |   |                                                                     |   |   | **Options                  Outstanding**             |   |   | **Options                  Exercisable** |      |
|-----------------------------------------------|--------|--------|-----------------------------------------|--------|--------|--------------------------------------------------------------------------|--------|--------|------------------------------------------------------|--------|--------|------------------------------------------|-----------|
| **Range                  of Exercise Prices** |   |   | **Number                  Outstanding** |   |   | **Weighted-Average                  Remaining Contractual Life (Years)** |   |   | **Weighted-Average                  Exercise Price** |   |   | **Number                  Outstanding**  |      |   | **Weighted-Average                  Exercise Price** |   |
| $                                             | 10.75  |   |                                    |   | -      |                                                                     |   | $      | 17.34                                                |   |   |                                     | 348,555   |   |   |   | 2.35 |   |   | $ | 15.26 |   |   |   | 244,995 |   |   | $ | 14.52 |   |
|                                          | 17.39  |   |                                    |   | -      |                                                                     |   |   | 33.67                                                |   |   |                                     | 304,260   |   |   |   | 4.82 |   |   |   | 29.27 |   |   |   | 64,020 |   |   |   | 26.64 |   |
|                                          | 33.95  |   |                                    |   | -      |                                                                     |   |   | 35.86                                                |   |   |                                     | 254,400   |   |   |   | 9.72 |   |   |   | 34.94 |   |   |   | 4,000 |   |   |   | 35.74 |   |
|                                          | 40.56  |   |                                    |   | -      |                                                                     |   |   | 42.24                                                |   |   |                                     | 157,250   |   |   |   | 5.87 |   |   |   | 40.91 |   |   |   | 13,020 |   |   |   | 40.80 |   |
|                                          | 46.92  |   |                                    |   | -      |                                                                     |   |   | 46.92                                                |   |   |                                     | 33,000    |   |   |   | 5.92 |   |   |   | 46.92 |   |   |   | 6,600 |   |   |   | 46.92 |   |
| $                                             | 10.75  |   |                                    |   | -      |                                                                     |   | $      | 46.92                                                |   |   |                                     | 1,097,465 |   |   |   | 5.35 |   |   | $ | 28.33 |   |   |   | 332,635 |   |   | $ | 18.78 |   |

***Employee      Stock Purchase Plan (“ESPP”).***
* *

**Note      3 – Inventories**

*(in thousands)*

|                                                             |   | **December                29, 2007** |   |   | **March                31, 2007** |   |
|------------------------------------------------------------------|--------|--------------------------------------|--------|--------|-----------------------------------|--------|
| Raw                materials                                     |   | $                                    | 1,441  |   |                              | $      | 1,648 |   |
| Work-in-process                                                  |   |                                 | 11,152 |   |                              |   | 8,382 |   |
| Finished                goods                                    |   |                                 | 3,209  |   |                              |   | 2,681 |   |
| Finished                goods at distributors and on consignment |   |                                 | 1,709  |   |                              |   | 1,527 |   |
| Inventories                                                      |   | $                                    | 17,511 |   |                              | $      | 14,238 |   |

----

**SUPERTEX,          INC.**
**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS         **

**(unaudited)**

**Note      4 - Comprehensive Income**

**Note      5 – Income Taxes**

*Accounting for Uncertainty in Income      Taxes - an interpretation of FASB Statement No. 109*

----

**SUPERTEX,          INC.**
**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS         **

**(unaudited)**

**Note        6 - Net Income per Share**

*in thousands, except per share amounts*

----

**SUPERTEX,          INC.**

**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS         **

**(unaudited)**

|                                                              |   | **Three                Months Ended** |   |   | **Nine                Months Ended** |   |
|-------------------------------------------------------------------|--------|---------------------------------------|--------|--------|--------------------------------------|--------|
|                                                              |   | **December                29, 2007**  |   |   | **December                30, 2006** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |
| BASIC:                                                            |   |                                  |   |   |                                 |   |   |   |   |   |   |   |
| Net                income                                         |   | $                                     | 3,677  |   |                                 | $      | 5,493 |   |   | $ | 12,651 |   |   | $ | 16,405 |   |
| Weighted                average shares outstanding for the period |   |                                  | 13,685 |   |                                 |   | 13,749 |   |   |   | 13,700 |   |   |   | 13,688 |   |
| Net                income per share                               |   | $                                     | 0.27   |   |                                 | $      | 0.40 |   |   | $ | 0.92 |   |   | $ | 1.20 |   |
|                                                              |   |                                  |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |
| DILUTED:                                                          |   |                                  |   |   |                                 |   |   |   |   |   |   |   |   |   |   |   |
| Net                income                                         |   | $                                     | 3,677  |   |                                 | $      | 5,493 |   |   | $ | 12,651 |   |   | $ | 16,405 |   |
| Weighted                average shares outstanding for the period |   |                                  | 13,685 |   |                                 |   | 13,749 |   |   |   | 13,700 |   |   |   | 13,688 |   |
| Dilutive                effect of stock options                   |   |                                  | 227    |   |                                 |   | 333 |   |   |   | 229 |   |   |   | 341 |   |
| Total                                                             |   |                                  | 13,912 |   |                                 |   | 14,082 |   |   |   | 13,929 |   |   |   | 14,029 |   |
| Net                income per share                               |   | $                                     | 0.26   |   |                                 | $      | 0.39 |   |   | $ | 0.91 |   |   | $ | 1.17 |   |

**Note        7 – Commitments and Contingencies**

***Indemnification***

----

**SUPERTEX,          INC.**

**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS         **

**(unaudited)**

***Legal      Proceedings***

***Product      Warranty***

*(in thousands)*

| Description                                         |   | Balance                at Beginning of Period |   |   | Charge(1) |   |   | Deductions                and Other(2) |   |   | Balance                at End of Period |   |
|-----------------------------------------------------|--------|-----------------------------------------------|--------|--------|-----------|--------|--------|----------------------------------------|--------|--------|-----------------------------------------|--------|
| Three                months ended December 29, 2007 |   |                                          |   |   |      |   |   |                                   |   |   |                                    |   |
| Allowance                for sales returns          |   | $                                             | 144    |   |      | $      | 476    |                                   |   | $      | (228                                    | )      |   | $ | 392 |   |
|                                                |   |                                          |   |   |      |   |   |                                   |   |   |                                    |   |   |   |   |   |
| Three                months ended December 30, 2006 |   |                                          |   |   |      |   |   |                                   |   |   |                                    |   |   |   |   |   |
| Allowance                for sales returns          |   | $                                             | 497    |   |      | $      | 182    |                                   |   | $      | (334                                    | )      |   | $ | 345 |   |
|                                                |   |                                          |   |   |      |   |   |                                   |   |   |                                    |   |   |   |   |   |
| Nine                months ended December 29, 2007  |   |                                          |   |   |      |   |   |                                   |   |   |                                    |   |   |   |   |   |
| Allowance                for sales returns          |   | $                                             | 199    |   |      | $      | 989    |                                   |   | $      | (796                                    | )      |   | $ | 392 |   |
|                                                |   |                                          |   |   |      |   |   |                                   |   |   |                                    |   |   |   |   |   |
| Nine                months ended December 30, 2006  |   |                                          |   |   |      |   |   |                                   |   |   |                                    |   |   |   |   |   |
| Allowance                for sales returns          |   | $                                             | 525    |   |      | $      | 859    |                                   |   | $      | (1,039                                  | )      |   | $ | 345 |   |

*(1)Allowances      for      sales returns are charged as a reduction to revenue.*

*(2)      Represents      amounts charged to the allowance for sales returns.*

----

**SUPERTEX,          INC.**

**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS         **

**(unaudited)**

***Operating      Lease Obligations***

*in thousands*

| **Payment                Due by Year** |   | **Operating                Lease** |   |
|----------------------------------------|--------|------------------------------------|--------|
| Less                than 1 year        |   | $                                  | 1,083  |   |
| 2                years                 |   |                               | 1,076  |   |
| 3                years                 |   |                               | 978    |   |
| 4                years                 |   |                               | 321    |   |
|                                   |   | $                                  | 3,458  |   |

*** *Note      8 – Common      Stock Repurchase**

|                                        |   | **Three                Months Ended** |      |   | **Nine                Months Ended** |   |
|---------------------------------------------|--------|---------------------------------------|-----------|--------|--------------------------------------|--------|
|                                        |   | **December                29, 2007**  |      |   | **December                30, 2006** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |
| Number                of shares repurchased |   |                                  | 212,560   |   |                                 |   | - |   |   |   | 317,360 |   |   |   | 35,000 |   |
| Cost                of shares repurchased   |   | $                                     | 7,379,000 |   |                                 | $      | - |   |   | $ | 10,628,000 |   |   | $ | 1,107,000 |   |
| Average                price per share      |   | $                                     | 34.71     |   |                                 | $      | - |   |   | $ | 33.49 |   |   | $ | 31.63 |   |

**Note        9 – Segment Information**

----

**SUPERTEX,          INC.**
**          NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS         **

**(unaudited)**

*(in      thousands):*

|                                              |   | **Three                Months Ended** |   |   | **Nine                Months Ended** |   |
|---------------------------------------------------|--------|---------------------------------------|--------|--------|--------------------------------------|--------|
| **Net                Sales**                      |   | **December                29, 2007**  |   |   | **December                30, 2006** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |
| Asia                (excluding China & Japan) |   | $                                     | 3,233  |   |                                 | $      | 4,387 |   |   | $ | 11,317 |   |   | $ | 12,456 |   |
| China                                             |   |                                  | 5,402  |   |                                 |   | 8,184 |   |   |   | 15,292 |   |   |   | 25,068 |   |
| Japan                                             |   |                                  | 1,575  |   |                                 |   | 1,580 |   |   |   | 5,715 |   |   |   | 5,565 |   |
| Europe                                            |   |                                  | 2,376  |   |                                 |   | 2,663 |   |   |   | 7,881 |   |   |   | 9,063 |   |
| United                States                      |   |                                  | 7,266  |   |                                 |   | 6,882 |   |   |   | 22,070 |   |   |   | 21,770 |   |
| Other                                             |   |                                  | 295    |   |                                 |   | 402 |   |   |   | 663 |   |   |   | 1,262 |   |
| Net                Sales                          |   | $                                     | 20,147 |   |                                 | $      | 24,098 |   |   | $ | 62,938 |   |   | $ | 75,184 |   |

*(in      thousands):*

| **Country**                  |   | **December                29, 2007** |   |   | **March                31, 2007** |   |
|------------------------------|--------|--------------------------------------|--------|--------|-----------------------------------|--------|
| United                States |   | $                                    | 8,843  |   |                              | $      | 7,516 |   |
| Hong                Kong     |   |                                 | 1,448  |   |                              |   | 1,135 |   |
|                         |   | $                                    | 10,291 |   |                              | $      | 8,651 |   |

**Note      10 – Significant Customers**

----

**Item      2.  Management's Discussion and Analysis of Financial Condition and      Results of Operations**

**Cautionary      Statement Regarding Forward Looking Statements**

*This        Quarterly Report on Form 10-Q includes forward-looking        statements.  These forward-looking statements are not historical        facts, and are based on current expectations, estimates, and projections        about        our industry, our beliefs, our assumptions, and our goals and        objectives.  Words such as "anticipates," "expects," "intends,"        "plans," "believes," "seeks," and "estimates " and variations of these words        and        similar expressions, are intended to identify forward-looking        statements.  Examples of the kinds of forward-looking statements in        this report include statements regarding the following: (1 )our belief that        it        is unlikely that any legal claims will result in a material adverse impact        on        the Company’s business, financial position, results of operations or cash flows;        (2) our expectation that LED lighting will grow during the fiscal 2008 and        beyond to become a significant market for Supertex; (3) our expectation that        medical sales will increase slightly in the fourth fiscal quarter and that        sales        of our high voltage analog switches and multiplexers, high voltage pulser        ICs,        high-speed MOSFET drivers, and discrete high voltage FETs to this market        will        continue to increase as the ultrasound market continues to expand globally;        (4)        Sales of EL inverters are expected to decline sequentially; (5) our plans        to        introduce more new integrated pulser ICs as well as ultrasound receiver blocks        and that custom high voltage pulsers are projected to contribute to our revenue        growth in the fourth quarter of fiscal 2008; (6) SG&A expenses are expected        to increase in the fourth quarter of fiscal year 2008; (7) our belief that        we        have adequately recorded tax liabilities in our financial statements for        additional taxes we may be required to pay as a result of the examinations        of        our fiscal 2002 and 2004 tax returns and that we do not anticipate any        payment of cash from uncertain tax positions within one year of the balance        sheet date  ; (8) that we expect to spend approximately        $4,500,000  for capital acquisitions during fiscal year 2008; (9) our        belief that we have substantial production capacity in place to handle any        projected increase in business in fiscal 2008; (10) our belief that existing        cash, cash equivalents and short-term investments, together with cash flow        from        operations, will be sufficient to meet our liquidity and capital requirements        through the next twelve months; (11) our belief that a significant change        in        interest rates would minimally impact interest income the fair value of our        investments; (12) our belief that our exposure to foreign currency exchange        risks is relatively small; (13) our growth strategy relying on continuous        introduction of new products and technologies; and (14) our expectation that        our        interest income during the fourth quarter will decline due to the lower interest        rates resulting from recent cuts in the Federal funds rate by the Federal        Reserve Board.*

*These        statements are only predictions, are not guarantees of future performance,        and        are subject to risks, uncertainties, and other factors, some of which are        beyond        our control and are difficult to predict, and could cause actual results        to        differ materially from those expressed or forecasted in the forward-looking        statements.  These risks and uncertainties include material adverse        changes in the demand for our customer’s products in which the Company’s        products are used; competition to supply semiconductor devices in the markets        in        which the Company competes increases and causes price erosion; demand does        not        materialize and increase for recently released customer products incorporating        the Company’s products; that we have delays in developing and releasing into        production our planned new products, that there could be unexpected        manufacturing issues as production ramps up; the demand for the Company’s        products or results of its product development changes such that it would        be        unwise not to decrease research and development; that the IRS will determine        that more US income was realized than the Company claimed or that fewer expenses        were allowable; that some of the Company’s equipment will not be unexpectedly        damaged or become obsolete, thereby requiring replacement; and that        short-term  interest rates will rise; as well as those described in "        Factors Which May Affect Operating Results" under Item 1A of Part I , “Risk        Factors” in the Company’s  annual report of Form 10-K for the fiscal        year ended March 31, 2007.  The information included in this Form 10-Q        is provided as of the filing date with the SEC and future events or        circumstances could differ significantly from the forward-looking statements        included herein.  Accordingly, the readers are cautioned not to place        undue reliance on such statements. Except as required by law, the Company        undertakes no obligation to update any forward-looking statement, as a result        of        new information, future events, or otherwise.*

----

**Critical      Accounting Policies**

***Income      Taxes***

*Accounting for Uncertainty      in Income Taxes: An Interpretation of FASB Statement No. 109 *

**Overview**

**Results      of Operations**

***Net      Sales***

----

*(dollars in      thousands)*

|                               |   |    **Three                Months Ended** |   |   | **Nine                Months Ended**  |   |
|------------------------------------|--------|---------------------------------------------------------|--------|--------|---------------------------------------|--------|
| **Net                Sales**       |   | **December                29, 2007**                    |   |   | **September                29, 2007** |   |   | **December                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| Medical                Electronics |   | $                                                       | 7,590  |   |                                  | $      | 7,990 |   |   | $ | 7,218 |   |   |   | -5 | % |   |   | 5 | % |   | $ | 23,790 |   |   |   | 22,439 |   |   |   | 6 | % |
| Imaging                            |   |                                                    | 6,804  |   |                                  |   | 7,400 |   |   |   | 10,422 |   |   |   | -8 | % |   |   | -35 | % |   |   | 20,413 |   |   |   | 32,360 |   |   |   | -37 | % |
| Industrial/                Other   |   |                                                    | 2,867  |   |                                  |   | 2,968 |   |   |   | 4,362 |   |   |   | -3 | % |   |   | -34 | % |   |   | 9,760 |   |   |   | 13,815 |   |   |   | -29 | % |
| Telecom                            |   |                                                    | 2,380  |   |                                  |   | 2,178 |   |   |   | 1,628 |   |   |   | 9 | % |   |   | 46 | % |   |   | 6,103 |   |   |   | 5,679 |   |   |   | 7 | % |
| LED                Lighting        |   |                                                    | 506    |   |                                  |   | 1493 |   |   |   | 468 |   |   |   | -66 | % |   |   | 8 | % |   |   | 2,872 |   |   |   | 891 |   |   |   | 222 | % |
| Net                Sales           |   | $                                                       | 20,147 |   |                                  | $      | 22,029 |   |   | $ | 24,098 |   |   |   | -9 | % |   |   | -16 | % |   | $ | 62,938 |   |   | $ | 75,184 |   |   |   | -16 | % |

|                               |   | **Three                Months Ended** |   |   | **Nine                Months Ended**  |   |
|------------------------------------|--------|---------------------------------------|--------|--------|---------------------------------------|--------|
| **Net                Sales**       |   | **December                29, 2007**  |   |   | **September                29, 2007** |   |   | **December                30, 2006** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |
| Medical                Electronics |   |                                  | 38     | %      |                                  |   | 36 | % |   |   | 30 | % |   |   | 38 | % |   |   | 30 | % |
| Imaging                            |   |                                  | 34     | %      |                                  |   | 34 | % |   |   | 43 | % |   |   | 32 | % |   |   | 43 | % |
| Industrial/Other                   |   |                                  | 14     | %      |                                  |   | 13 | % |   |   | 18 | % |   |   | 15 | % |   |   | 18 | % |
| Telecom                            |   |                                  | 12     | %      |                                  |   | 10 | % |   |   | 7 | % |   |   | 10 | % |   |   | 8 | % |
| LED                Lighting        |   |                                  | 2      | %      |                                  |   | 7 | % |   |   | 2 | % |   |   | 5 | % |   |   | 1 | % |
| Net                Sales           |   |                                  | 100    | %      |                                  |   | 100 | % |   |   | 100 | % |   |   | 100 | % |   |   | 100 | % |

----

----

*(in thousands):*

|                                              |   | **Three                Months Ended** |   |   | **Nine                Months Ended**  |   |
|---------------------------------------------------|--------|---------------------------------------|--------|--------|---------------------------------------|--------|
| **Net                Sales**                      |   | **December                29, 2007**  |   |   | **September                29, 2007** |   |   | **December                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| Asia                (excluding China & Japan) |   | $                                     | 3,233  |   |                                  | $      | 4,362 |   |   | $ | 4,387 |   |   |   | -26 | % |   |   | -26 | % |   | $ | 11,317 |   |   | $ | 12,456 |   |   |   | -9 | % |
| China                                             |   |                                  | 5,402  |   |                                  |   | 5,377 |   |   |   | 8,184 |   |   |   | 0 | % |   |   | -34 | % |   |   | 15,292 |   |   |   | 25,068 |   |   |   | -39 | % |
| Japan                                             |   |                                  | 1,575  |   |                                  |   | 1,929 |   |   |   | 1,580 |   |   |   | -18 | % |   |   | 0 | % |   |   | 5,715 |   |   |   | 5,565 |   |   |   | 3 | % |
| Europe                                            |   |                                  | 2,376  |   |                                  |   | 2,936 |   |   |   | 2,663 |   |   |   | -19 | % |   |   | -11 | % |   |   | 7,881 |   |   |   | 9,063 |   |   |   | -13 | % |
| United                States                      |   |                                  | 7,266  |   |                                  |   | 7,220 |   |   |   | 6,882 |   |   |   | 1 | % |   |   | 6 | % |   |   | 22,070 |   |   |   | 21,770 |   |   |   | 1 | % |
| Other                                             |   |                                  | 295    |   |                                  |   | 205 |   |   |   | 402 |   |   |   | 44 | % |   |   | -27 | % |   |   | 663 |   |   |   | 1,262 |   |   |   | -47 | % |
| Net                Sales                          |   | $                                     | 20,147 |   |                                  | $      | 22,029 |   |   | $ | 24,098 |   |   |   | -9 | % |   |   | -16 | % |   | $ | 62,938 |   |   | $ | 75,184 |   |   |   | -16 | % |
|                                              |   |                                  |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| International                Sales                |   | $                                     | 12,881 |   |                                  | $      | 14,809 |   |   | $ | 17,216 |   |   |   | -13 | % |   |   | -25 | % |   | $ | 40,868 |   |   | $ | 53,414 |   |   |   | -23 | % |
| Domestic                Sales                     |   |                                  | 7,266  |   |                                  |   | 7,220 |   |   |   | 6,882 |   |   |   | 1 | % |   |   | 6 | % |   |   | 22,070 |   |   |   | 21,770 |   |   |   | 1 | % |
| Net                Sales                          |   | $                                     | 20,147 |   |                                  | $      | 22,029 |   |   | $ | 24,098 |   |   |   | -9 | % |   |   | -16 | % |   | $ | 62,938 |   |   | $ | 75,184 |   |   |   | -16 | % |

***Gross      Profit***

----

|                                                                                              |   | **Three                Months Ended** |   |   | **Nine                Months Ended**  |   |
|---------------------------------------------------------------------------------------------------|--------|---------------------------------------|--------|--------|---------------------------------------|--------|
| *(Dollars                in thousands)*                                                           |   | **December                29, 2007**  |   |   | **September                29, 2007** |   |   | **December                30, 2006** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |
| Gross                Margin Percentage                                                            |   |                                  | 56     | %      |                                  |   | 59 | % |   |   | 59 | % |   |   | 59 | % |   |   | 60 | % |
| *Included                in Gross Margin Percentage Above*                                        |   |                                  |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Gross                Margin Benefit from Sale of Previously Written Down                Inventory |   | $                                     | 287    |   |                                  | $      | 380 |   |   | $ | 351 |   |   | $ | 1,065 |   |   | $ | 1,301 |   |
| Percentage                of Net Sales                                                            |   |                                  | 1      | %      |                                  |   | 2 | % |   |   | 1 | % |   |   | 2 | % |   |   | 2 | % |

***Research      and Development (R&D) Expenses***

|                                    |   | **Three                Months Ended** |   |   | **Nine                Months Ended**  |   |
|-----------------------------------------|--------|---------------------------------------|--------|--------|---------------------------------------|--------|
| *(Dollars                in thousands)* |   | **December                29, 2007**  |   |   | **September                29, 2007** |   |   | **December                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| R&D                Expenses         |   | $                                     | 3,358  |   |                                  | $      | 3,858 |   |   | $ | 3,688 |   |   |   | -13 | % |   |   | -9 | % |   | $ | 10,981 |   |   | $ | 11,295 |   |   |   | -3 | % |
| Percentage                of Net Sales  |   |                                  | 17     | %      |                                  |   | 18 | % |   |   | 15 | % |   |   |   |   |   |   |   |   |   |   | 17 | % |   |   | 15 | % |   |   |   |   |

----

***Selling,      General and Administrative (SG&A) Expenses***

|                                    |   | **Three                Months Ended** |   |   | **Nine                Months Ended**  |   |
|-----------------------------------------|--------|---------------------------------------|--------|--------|---------------------------------------|--------|
| *(Dollars                in thousands)* |   | **December                29, 2007**  |   |   | **September                29, 2007** |   |   | **December                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **December                29, 2007** |   |   | **December                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| SG&A                Expenses        |   | $                                     | 3,888  |   |                                  | $      | 4,192 |   |   | $ | 4,152 |   |   |   | -7 | % |   |   | -6 | % |   | $ | 11,726 |   |   | $ | 11,781 |   |   |   | 0 | % |
| Percentage                of Net Sales  |   |                                  | 19     | %      |                                  |   | 19 | % |   |   | 17 | % |   |   |   |   |   |   |   |   |   |   | 19 | % |   |   | 16 | % |   |   |   |   |

----

***Interest        Income and Other Income, Net***

|                                                   |   | **Three                  Months Ended** |   |   | **Nine                  Months Ended**  |   |
|--------------------------------------------------------|--------|-----------------------------------------|--------|--------|-----------------------------------------|--------|
| *(Dollars                  in thousands)*              |   | **December                  29, 2007**  |   |   | **September                  29, 2007** |   |   | **December                  30, 2006** |   |   | **Sequential                  Change** |   |   | **Year-Over-Year                  Change** |   |   | **December                  29, 2007** |   |   | **December                  30, 2006** |   |   | **Year-Over-Year                  Change** |   |
| Interest                  Income and Other Income, Net |   | $                                       | 1,332  |   |                                    | $      | 1,587 |   |   | $ | 1,650 |   |   |   | -16 | % |   |   | -19 | % |   | $ | 4,426 |   |   | $ | 3,906 |   |   |   | 13 | % |
| Percentage                  of Net Sales               |   |                                    | 7      | %      |                                    |   | 7 | % |   |   | 7 | % |   |   |   |   |   |   |   |   |   |   | 7 | % |   |   | 5 | % |   |   |   |   |

***Provision      for Income Taxes***

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**Financial          Condition**

***Overview***

***Liquidity        and Capital Resources***

|                                                                |   | **Nine                Months Ended** |   |
|---------------------------------------------------------------------|--------|--------------------------------------|--------|
| *(Dollars                in thousands)*                             |   | **December                29, 2007** |   |   | **December                30, 2006** |   |
| Net                cash provided by operating activities            |   | $                                    | 14,550 |   |   | $ | 21,849 |   |
| Net                cash used in investing activities                |   |                                 | (4,866 | ) |   |   | (28,792 | ) |
| Net                cash provided by (used in) financing activities  |   |                                 | (8,357 | ) |   |   | 4,132 |   |
| Net                increase (decrease) in cash and cash equivalents |   | $                                    | 1,327  |   |   | $ | (2,811 | ) |

***Operating      Activities***

***Investing      Activities***

----

***Financing      Activities***

***Off-Balance      Sheet Arrangements***

***Contractual      Obligations***

----

*in thousands*

|                                                |   | **Payment                  Due by Year**    |   |
|-----------------------------------------------------|--------|------------------------------------------------------------|--------|
| **Contractual                  Obligations**        |   | **Total**                                                  |   |   | **Less                  than 1 Year** |   |   | **1-2                  Years** |   |   | **2-3                  Years** |   |   | **3-4                  Years** |   |
| Operating                  lease obligations (1)    |   | $                                                          | 3,458  |   |   | $ | 1,083 |   |   | $ | 1,076 |   |   | $ | 978 |   |   | $ | 321 |   |
| Purchase                  obligations (2)           |   |                                                       | 6,062  |   |   |   | 5,460 |   |   |   | 567 |   |   |   | 35 |   |   |   | - |   |
| Total                  contractual cash obligations |   | $                                                          | 9,520  |   |   | $ | 6,543 |   |   | $ | 1,643 |   |   | $ | 1,013 |   |   | $ | 321 |   |

|   | *(1)                  We lease                  facilities under non-cancelable lease agreements expiring at various                  times                  through April 2011.  Rental expense net of sublease income for                  the three months ended December 29, 2007, amounted to                  $233,000.* |
|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | *(2)                  To obtain                  favorable pricing and resource commitment, we commit to volume                  purchases                  from suppliers of manufacturing materials and                  services.* |
|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

***Recent        Accounting Pronouncements***

*Business        Combinations*

*Noncontrolling Interests in        Consolidated Financial Statements, an amendment of ARB No. 51*

*The Fair Value Option for Financial Assets and Financial Liabilities*

*Fair Value Measurements*

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***Available        Information***

**Item      3.  Quantitative and Qualitative Disclosures About Market      Risk**

***Interest      Rate Risk***

***Foreign      Currency Exchange Risks***

**Item      4.  Controls and      Procedures**

**(a)      Disclosure Controls and Procedures.**

*Disclosure      Controls and Procedures*
*.*

----

*Limitations        on the Effectiveness of Disclosure Controls*
*.*

*Evaluation        of Disclosure Controls and Procedures.*

**(b)      Internal Control over Financial Reporting.**

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**PART      II - OTHER INFORMATION**

**Item      1.  Legal Proceedings**

**Item      1A.  Risk Factors**

**Item      2. Unregistered      Sales of Equity Securities and Use of Proceeds**

| **Period**                         |   | **Total                Number of Shares Purchased (1)** |        |   | **Average                Price Paid Per Share** |   |      | **Total                Number of Shares Purchased as Part of Publicly Announced Plans or                Programs(2)** |   |       | **Maximum                Number of Shares that May Yet be Purchased Under the Plans or                Programs** |   |
|------------------------------------|--------|---------------------------------------------------------|-------------|--------|-------------------------------------------------|--------|-----------|-----------------------------------------------------------------------------------------------------------------------|--------|------------|------------------------------------------------------------------------------------------------------------------|--------|
| 09/30/07                - 10/27/07 |   |                                                    | -           |   |                                            |   | -         |                                                                                                                  |   |       | -                                                                                                                |   |   |   | 624,300 |   |
| 10/28/07                - 11/24/07 |   |                                                    | 167,560     |   |                                            | $      | 35.54     |                                                                                                                  |   |       | -                                                                                                                |   |   |   | 456,740 |   |
| 11/25/07                - 12/29/07 |   |                                                    | 45,000      |   |                                            |   | 31.65     |                                                                                                                  |   |       | -                                                                                                                |   |   |   | 411,740 |   |
| **Total**                          |   | ** **                                              | **212,560** |   |                                            | **$**  | **34.71** |                                                                                                                  |   | ** ** | **-**                                                                                                            |   |   | ** ** | **411,740** |   |

| *(1)  * | *Our                current share repurchase program, under which we repurchased these                212,560                shares during the three months ended December 29, 2007, has been                in place                since 1999. We are not certain but do not believe we publicly announced                this program, although our financial statements have reflected purchases                from time to time under this program. These 212,560 shares were purchased                in open market transactions.* |
|-------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| *(2)  * | *We                adopted a share repurchase program in 1992 authorizing the repurchase                of                1,000,000 shares. The board of directors terminated this program                in 1999                after 938,000 shares had been repurchased and adopted a share repurchase                program authorizing the repurchase of 900,000 shares plus the 62,000                shares authorized for repurchase under the 1992 program whose repurchase                had not been affected. As described in footnote (1), we are not certain                but do not believe that we publicly announced the 1999 repurchase                plan.                The 1999 repurchase program has no expiration date, other than, unless                extended, when an aggregate of 962,000 shares have been repurchased.                On                January 30th,                2008, the                board of directors amended the repurchase program to add 1,000,000                shares.                Neither this program nor any other repurchase program or plan has                expired                during the third fiscal quarter ended December 29, 2007 nor have                we                decided to terminate any repurchase plan or program prior to expiration.                There are no existing repurchase plans or programs under which we                do not                intend to make further                purchases.* |
|-------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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**Item      3.  Defaults Upon Senior Securities**

**Item      4.  Submission of Matters to a Vote of Security      Holders**

** Item      5.  Other      Information**

**Item      6.  Exhibits**

|   | Exhibit                31.1 & 31.2 - Certification of Chief Executive Officer and of Chief                Financial Officer pursuant to Securities and Exchange Act Rules 13a-14(a)                and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley                Act of 2002. |
|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | Exhibit                32.1 & 32.2 - Certification of Chief Executive Officer and 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. |
|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

**SIGNATURE**

**SUPERTEX,      INC.**

*        (Registrant)*

| /s/                Phillip A. Kagel                                        |
|----------------------------------------------------------------------------|
|  Phillip                A. Kagel                                      |
|  VP,                Finance & Chief Financial Officer             |
| (Principal                Accounting and Financial                Officer) |

----

**Exhibit      31.1**

**Certifications      Under Rule 13a-14(a)/l5d-14(a)**

|  /s/                Henry C. Pao                        |
|--------------------------------------------------------------|
|  Henry                C. Pao, Ph.D.                     |
|  President                & Chief Executive Officer |
|  (Principal                Executive Officer)           |

----

**Exhibit      31.2**

**Certifications      Under Rule 13a-14(a)/l5d-14(a)**

| /s/              Phillip A. Kagel                            |
|--------------------------------------------------------------|
|  Phillip              A. Kagel                          |
|  VP,              Finance & Chief Financial Officer |
| (Principal              Accounting and Financial Officer)    |

----

**Exhibit      32.1**

**Statement      of Chief Executive Officer under 18 U.S.C. § 1350**

|   | (i) | the                quarterly report of the Company on Form 10-Q for the period ended                December 29, 2007, as filed with the Securities and Exchange Commission                (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                at the dates and for the periods                indicated. |
|--------|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| /s/              Henry C. Pao                              |
|------------------------------------------------------------|
|  Henry              C. Pao, Ph.D.                     |
|  President              & Chief Executive Officer |
|  (Principal              Executive Officer)           |

*The      material contained in this Exhibit 32.1 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.*

**Exhibit      32.2**

**Statement      of Chief Financial Officer under 18 U.S.C. § 1350**

|   | (i) | the                quarterly report of the Company on Form 10-Q for the period ended                December 29, 2007, as filed with the Securities and Exchange Commission                (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                at the dates and for the periods                indicated. |
|--------|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| /s/              Phillip A. Kagel                            |
|--------------------------------------------------------------|
|  Phillip              A. Kagel                          |
|  VP,              Finance & Chief Financial Officer |
| (Principal                Accounting and Financial 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.*

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