| **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 September 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 November 6, 2007 |
| Common                Stock, no par value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 13,650,202 |
| *Exhibit                index is on Page 28*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| *Total                number of pages: 32*                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |

----

**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 | 15                      |
| Item                3.           | Quantitative                and Qualitative Disclosures About Market Risk                                                 | 25                      |
| Item                4.           | Controls                and Procedures                                                                                    | 26                      |
|                             |                                                                                                                      |                    |
|                             | PART                II – OTHER INFORMATION                                                                          |                    |
| Item                1.           | Legal                Proceedings                                                                                          | 27                      |
| Item                1A.          | Risk                Factors                                                                                               | 27                      |
| Item                2.           | Unregistered                Sales of Equity Securities and Use of Proceeds                                                | 27                      |
| Item                3.           | Defaults                Upon Senior Securities                                                                            | 28                      |
| Item                4.           | Submission                of Matters to a Vote of Security Holders                                                        | 28                      |
| Item                5.           | Other                Information                                                                                          | 28                      |
| Item                6.           | Exhibits                                                                                                                  | 28                      |
|                             |                                                                                                                      |                    |
| Signature                        |                                                                                                                      | 29                      |

----

**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**    |   |   | **Six                Months Ended**      |   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|--------|------------------------------------------|--------|--------|------------------------------------------|--------|
|                                                                                                                                                |   | **September                29,****2007** |   |   | **September                30,****2006** |   |   | **September                29,****2007** |   |   | **September                30,****2006** |   |
| Net                sales                                                                                                                            |   | $                                        | 22,029 |   |                                     | $      | 26,521 |   |   | $ | 42,791 |   |   | $ | 51,086 |   |
| Cost                of sales(1)                                                                                                                     |   |                                     | 9,020  |   |                                     |   | 10,305 |   |   |   | 17,096 |   |   |   | 20,142 |   |
| Gross                profit                                                                                                                         |   |                                     | 13,009 |   |                                     |   | 16,216 |   |   |   | 25,695 |   |   |   | 30,944 |   |
| Research                and development(1)                                                                                                          |   |                                     | 3,858  |   |                                     |   | 3,658 |   |   |   | 7,623 |   |   |   | 7,607 |   |
| Selling,                general and administrative(1)                                                                                               |   |                                     | 4,192  |   |                                     |   | 3,826 |   |   |   | 7,838 |   |   |   | 7,629 |   |
| Total                operating expenses                                                                                                             |   |                                     | 8,050  |   |                                     |   | 7,484 |   |   |   | 15,461 |   |   |   | 15,236 |   |
| Income                from operations                                                                                                               |   |                                     | 4,959  |   |                                     |   | 8,732 |   |   |   | 10,234 |   |   |   | 15,708 |   |
| Interest                income                                                                                                                      |   |                                     | 1,441  |   |                                     |   | 1,202 |   |   |   | 2,821 |   |   |   | 2,313 |   |
| Other                income (expense), net                                                                                                          |   |                                     | 146    |   |                                     |   | (234 | ) |   |   | 273 |   |   |   | (57 | ) |
| Income                before provision for income taxes                                                                                             |   |                                     | 6,546  |   |                                     |   | 9,700 |   |   |   | 13,328 |   |   |   | 17,964 |   |
| Provision                for income taxes                                                                                                           |   |                                     | 2,045  |   |                                     |   | 3,704 |   |   |   | 4,354 |   |   |   | 7,052 |   |
| Net                income                                                                                                                           |   | $                                        | 4,501  |   |                                     | $      | 5,996 |   |   | $ | 8,974 |   |   | $ | 10,912 |   |
| Net                income per share:                                                                                                                |   |                                     |   |   |                                     |   |   |   |   |   |   |   |   |   |   |   |
| Basic                                                                                                                                               |   | $                                        | 0.33   |   |                                     | $      | 0.44 |   |   | $ | 0.65 |   |   | $ | 0.80 |   |
| Diluted                                                                                                                                             |   | $                                        | 0.32   |   |                                     | $      | 0.43 |   |   | $ | 0.64 |   |   | $ | 0.78 |   |
|                                                                                                                                                |   |                                     |   |   |                                     |   |   |   |   |   |   |   |   |   |   |   |
| Shares                used in per share computation:                                                                                                |   |                                     |   |   |                                     |   |   |   |   |   |   |   |   |   |   |   |
| Basic                                                                                                                                               |   |                                     | 13,755 |   |                                     |   | 13,671 |   |   |   | 13,767 |   |   |   | 13,658 |   |
| Diluted                                                                                                                                             |   |                                     | 13,987 |   |                                     |   | 13,989 |   |   |   | 13,999 |   |   |   | 14,000 |   |
|                                                                                                                                                |   |                                     |   |   |                                     |   |   |   |   |   |   |   |   |   |   |   |
| (1)Includes                amortization of employee stock-based compensation as                follows.  See Note 2 for more information: |   |                                     |   |   |                                     |   |   |   |   |   |   |   |   |   |   |   |
| Cost                of sales                                                                                                                        |   | $                                        | 132    |   |                                     | $      | 92 |   |   | $ | 274 |   |   | $ | 157 |   |
| Research                and development                                                                                                             |   | $                                        | 189    |   |                                     | $      | 396 |   |   | $ | 465 |   |   | $ | 783 |   |
| Selling,                general and   administrative                                                                                 |   | $                                        | 183    |   |                                     | $      | 163 |   |   | $ | 421 |   |   | $ | 359 |   |

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

----

**SUPERTEX,      INC.**

**CONDENSED      CONSOLIDATED BALANCE SHEETS**

*(unaudited,      in thousands)*

|                                                                                                                                                                     |   | **September                29, 2007** |    |   | **March                31, 2007** |   |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------------------------------|---------|--------|-----------------------------------|--------|
| **ASSETS**                                                                                                                                                               |   |                                  |    |   |                              |   |
| Current                Assets:                                                                                                                                           |   |                                  |    |   |                              |   |
| Cash                and cash equivalents                                                                                                                                 |   | $                                     | 22,630  |   |                              | $      | 22,652 |   |
| Short-term                investments                                                                                                                                    |   |                                  | 120,311 |   |                              |   | 116,264 |   |
| Trade                accounts receivable                                                                                                                                 |   |                                  | 14,222  |   |                              |   | 12,793 |   |
| Inventories                                                                                                                                                              |   |                                  | 16,845  |   |                              |   | 14,238 |   |
| Prepaid                expenses and other current assets                                                                                                                 |   |                                  | 3,141   |   |                              |   | 2,172 |   |
| Deferred                income taxes                                                                                                                                     |   |                                  | 8,122   |   |                              |   | 8,123 |   |
| Total                current assets                                                                                                                                      |   |                                  | 185,271 |   |                              |   | 176,242 |   |
| Property,                plant and equipment, net                                                                                                                        |   |                                  | 10,258  |   |                              |   | 8,651 |   |
| Other                assets                                                                                                                                              |   |                                  | 391     |   |                              |   | 140 |   |
| Deferred                income taxes                                                                                                                                     |   |                                  | 1,823   |   |                              |   | 899 |   |
| **TOTAL                ASSETS**                                                                                                                                          |   | $                                     | 197,743 |   |                              | $      | 185,932 |   |
|                                                                                                                                                                     |   |                                  |    |   |                              |   |   |   |
|                                                                                                                                                                     |   |                                  |    |   |                              |   |   |   |
| **LIABILITIES                AND SHAREHOLDERS’ EQUITY**                                                                                                            |   |                                  |    |   |                              |   |   |   |
| Current                Liabilities:                                                                                                                                      |   |                                  |    |   |                              |   |   |   |
| Trade                accounts payable                                                                                                                                    |   | $                                     | 5,064   |   |                              | $      | 4,120 |   |
| Accrued                salaries and employee benefits                                                                                                                    |   |                                  | 12,584  |   |                              |   | 12,102 |   |
| Other                accrued liabilities                                                                                                                                 |   |                                  | 1,883   |   |                              |   | 2,175 |   |
| Deferred                revenue                                                                                                                                          |   |                                  | 3,279   |   |                              |   | 2,965 |   |
| Income                taxes payable                                                                                                                                      |   |                                  | --      |   |                              |   | 3,318 |   |
| Total                current liabilities                                                                                                                                 |   |                                  | 22,810  |   |                              |   | 24,680 |   |
|     Income                taxes payable, noncurrent                                                                                                  |   |                                  | 5,101   |   |                              |   | -- |   |
| TOTAL                LIABILITIES                                                                                                                                         |   | $                                     | 27,911  |   |                              | $      | 24,680 |   |
|                                                                                                                                                                     |   |                                  |    |   |                              |   |   |   |
| Commitments                and contingencies (See 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 13,773 shares and 13,794                shares* |   |                                  | 57,279  |   |                              |   | 54,741 |   |
|                        Retained earnings                                                                                              |   |                                  | 112,553 |   |                              |   | 106,511 |   |
| TOTAL                SHAREHOLDERS’ EQUITY                                                                                                                          |   |                                  | 169,832 |   |                              |   | 161,252 |   |
| **TOTAL                LIABILITIES AND SHAREHOLDERS’ EQUITY**                                                                                                      |   | $                                     | 197,743 |   |                              | $      | 185,932 |   |

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

----

**SUPERTEX,      INC.**

**CONDENSED      CONSOLIDATED STATEMENTS OF CASH FLOWS**

*(unaudited,      in thousands)*

|                                                                                                                                                                                                               |   |  **Six                Months Ended** |    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-------------------------------------------|---------|
|   CASH                FLOWS FROM OPERATING ACTIVITIES                                                                                                                                                    |   | **September                29,****2007**  |    |   | **September                30,****2006** |   |
|   Net                income                                                                                                                                                                              |   | $                                         | 8,974   |   |   | $ | 10,912 |   |
|     Non-cash                adjustments to net income:                                                                                                                                         |   |                                      |    |   |   |   |   |   |
|          Depreciation                                                                                                                                                 |   |                                      | 1,388   |   |   |   | 1,340 |   |
|          Provision                for doubtful accounts and sales returns                                                                                             |   |                                      | 524     |   |   |   | 575 |   |
|          Provision                for excess and obsolete inventories                                                                                                 |   |                                      | 850     |   |   |   | 1,189 |   |
|          Stock-based                compensation expense                                                                                                              |   |                                      | 1,160   |   |   |   | 1,378 |   |
|          Tax                benefit related to stock-based compensation plans                                                                                         |   |                                      | 363     |   |   |   | 526 |   |
|          Excess                tax benefit related to stock-based compensation plans                                                                                  |   |                                      | (181    | ) |   |   | (292 | ) |
|          Gain                on disposal of property, plant and equipment                                                                                             |   |                                      | (200    | ) |   |   | - |   |
|   Changes                in operating assets and liabilities:                                                                                                                                            |   |                                      |    |   |   |   |   |   |
|          Short-term                investments, categorized as trading                                                                                                |   |                                      | (447    | ) |   |   | 745 |   |
|          Trade                accounts receivable                                                                                                                     |   |                                      | (1,953  | ) |   |   | (1,884 | ) |
|          Inventories                                                                                                                                                  |   |                                      | (3,457  | ) |   |   | (1,459 | ) |
|          Prepaid                expenses and other assets                                                                                                             |   |                                      | (1,220  | ) |   |   | (456 | ) |
|          Trade                accounts payable and accrued expenses                                                                                                   |   |                                      | 1,134   |   |   |   | 277 |   |
|          Deferred                revenue                                                                                                                              |   |                                      | 314     |   |   |   | 815 |   |
|          Deferred                income taxes                                                                                                                         |   |                                      | (923    | ) |   |   | - |   |
|          Income                taxes payable                                                                                                                          |   |                                      | 1,690   |   |   |   | 397 |   |
|                         Net                cash provided by operating activities           |   |                                      | 8,016   |   |   |   | 14,063 |   |
|   CASH                FLOWS FROM INVESTING ACTIVITIES                                                                                                                                                    |   |                                      |    |   |   |   |   |   |
|     Purchases                of property, plant and equipment                                                                                                                                  |   |                                      | (2,995  | ) |   |   | (1,968 | ) |
|     Proceeds                from disposal of property and equipment                                                                                                                            |   |                                      | 200     |   |   |   | - |   |
|     Purchases                of short-term investments, categorized as available for                sale                                                                                       |   |                                      | (67,100 | ) |   |   | (186,664 | ) |
| Sales                and maturities of short-term investments, categorized as available                for                sale                                                                                     |   |                                      | 63,500  |   |   |   | 166,465 |   |
|                         Net                cash used in investing activities               |   |                                      | (6,395  | ) |   |   | (22,167 | ) |
|   CASH                FLOWS FROM FINANCING ACTIVITIES                                                                                                                                                    |   |                                      |    |   |   |   |   |   |
|     Proceeds                from exercise of stock options and employee stock purchase                plan                                                                                     |   |                                      | 1,425   |   |   |   | 2,124 |   |
|     Repurchase                of common stock                                                                                                                                                  |   |                                      | (3,249  | ) |   |   | (1,107 | ) |
|     Excess                tax benefit related to stock-based compensation plans                                                                                                                |   |                                      | 181     |   |   |   | 292 |   |
|                         Net                cash provided by (used in) financing activities |   |                                      | (1,643  | ) |   |   | 1,309 |   |
|   NET                DECREASE IN CASH AND CASH EQUIVALENTS                                                                                                                                               |   |                                      | (22     | ) |   |   | (6,795 | ) |
|                                                                                                                                                                                                               |   |                                      |    |   |   |   |   |   |
|   CASH                AND CASH EQUIVALENTS:                                                                                                                                                              |   |                                      |    |   |   |   |   |   |
|         Beginning                of                period                                                                                                                  |   |                                      | 22,652  |   |   |   | 27,654 |   |
|         End                of                period                                                                                                                        |   | $                                         | 22,630  |   |   | $ | 20,859 |   |
| Supplemental                cash flow disclosures:                                                                                                                                                                 |   |                                      |    |   |   |   |   |   |
|         Income                taxes paid, net of refunds                                                                                                                   |   | $                                         | 4,185   |   |   | $ | 6,360 |   |
|                                                                                                                                                                                                               |   |                                      |    |   |   |
| *See                accompanying Notes to Unaudited Condensed Consolidated Financial                Statements.*                                                                                                   |   |                                      |    |   |   |

----

**SUPERTEX,              INC.**

**          NOTES              TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS        **

**(unaudited)**

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

*Reclassification*

*Recent      Accounting Pronouncements*

*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 *

----

** **

**SUPERTEX,          INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS (CONTINUED)**

**(unaudited)**

**Note      2 - Stock-Based Compensation**

*Share-Based Payment.*

|                                                          |   | **Three                Months Ended**    |   |   | **Six                Months Ended**      |   |
|---------------------------------------------------------------|--------|------------------------------------------|--------|--------|------------------------------------------|--------|
|                                                          |   | **September                29,****2007** |   |   | **September                30,****2006** |   |   | **September                29,****2007** |   |   | **September                30,****2006** |   |
| Stock-based                compensation expense               |   | $                                        | 504    |   |                                     | $      | 651 |   |   | $ | 1,160 |   |   | $ | 1,299 |   |
| Tax                effect of stock-based compensation expense |   |                                     | (42    | )      |                                     |   | 31 |   |   |   | (104 | ) |   |   | (17 | ) |
| Effect                on net income                           |   | $                                        | 462    |   |                                     | $      | 682 |   |   | $ | 1,056 |   |   | $ | 1,282 |   |

|                                       |   |                             |     |   | **Options                Outstanding** |   |
|--------------------------------------------|--------|----------------------------------|----------|--------|----------------------------------------|--------|
|                                       |   | **Available                For** |     |   | **Number                of**           |   |   | **Weighted                Average** |   |
|                                       |   | **Grant**                        |     |   | **Shares**                             |   |   | **Exercise                Price** |   |
| Balance,                March 31, 2007     |   |                             | 885,579  |   |                                   |   | 1,052,370 |   |   | $ | 27.08 |   |
|      Granted      |   |                             | (139,100 | )      |                                   |   | 139,100 |   |   |   | 35.67 |   |
|      Exercised    |   |                             | --       |   |                                   |   | (80,405 | ) |   |   | 16.67 |   |
|      Canceled     |   |                             | 99,500   |   |                                   |   | (99,500 | ) |   |   | 41.76 |   |
| Balance,                September 29, 2007 |   |                             | 845,979  |   |                                   |   | 1,011,565 |   |   | $ | 27.54 |   |

----

**SUPERTEX,          INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS (CONTINUED)**

**(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  |   |                                     |   | -      |                                                                     |   | $ | 17.06 |   |   |   | 214,255 |   |   |   | 2.26 |   |   | $ | 13.95 |   |   |   | 155,995 |   |   | $ | 12.92 |   |
|                                          | 17.11  |   |                                     |   | -      |                                                                     |   |   | 19.37 |   |   |   | 202,300 |   |   |   | 3.41 |   |   |   | 17.51 |   |   |   | 74,520 |   |   |   | 17.50 |   |
|                                          | 19.56  |   |                                     |   | -      |                                                                     |   |   | 33.67 |   |   |   | 263,160 |   |   |   | 5.02 |   |   |   | 31.25 |   |   |   | 54,040 |   |   |   | 28.72 |   |
|                                          | 35.37  |   |                                     |   | -      |                                                                     |   |   | 41.05 |   |   |   | 294,150 |   |   |   | 7.78 |   |   |   | 38.60 |   |   |   | 15,940 |   |   |   | 39.35 |   |
|                                          | 42.24  |   |                                     |   | -      |                                                                     |   |   | 46.92 |   |   |   | 37,700 |   |   |   | 6.05 |   |   |   | 46.34 |   |   |   | 940 |   |   |   | 42.24 |   |
| $                                             | 10.75  |   |                                     |   | -      |                                                                     |   | $ | 46.92 |   |   |   | 1,011,565 |   |   |   | 4.96 |   |   | $ | 27.54 |   |   |   | 301,435 |   |   | $ | 18.38 |   |

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

----

**SUPERTEX,          INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS (CONTINUED)**

**(unaudited)**

**Note      3 – Inventories**

*(in thousands)*

|                                                             |   | **September                29, 2007** |   |   | **March                31, 2007** |   |
|------------------------------------------------------------------|--------|---------------------------------------|--------|--------|-----------------------------------|--------|
| Raw                materials                                     |   | $                                     | 1,584  |   |                              | $      | 1,648 |   |
| Work-in-process                                                  |   |                                  | 10,810 |   |                              |   | 8,382 |   |
| Finished                goods                                    |   |                                  | 2,788  |   |                              |   | 2,681 |   |
| Finished                goods at distributors and on consignment |   |                                  | 1,663  |   |                              |   | 1,527 |   |
| Inventories                                                      |   | $                                     | 16,845 |   |                              | $      | 14,238 |   |

**Note      4 - Comprehensive Income**

**Note      5 – Income Taxes**

----

**SUPERTEX,          INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS (CONTINUED)**

**(unaudited)**

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

----

**SUPERTEX,          INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS (CONTINUED)**

**(unaudited)**

**Note      6 - Net Income per Share**

*in thousands, except per share amounts*

|                                                              |   | **Three                Months Ended** |   |   | **Six                Months Ended**   |   |
|-------------------------------------------------------------------|--------|---------------------------------------|--------|--------|---------------------------------------|--------|
|                                                              |   | **September                29, 2007** |   |   | **September                30, 2006** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |
| BASIC:                                                            |   |                                  |   |   |                                  |   |   |   |   |   |   |   |
| Net                income                                         |   | $                                     | 4,501  |   |                                  | $      | 5,996 |   |   | $ | 8,974 |   |   | $ | 10,912 |   |
| Weighted                average shares outstanding for the period |   |                                  | 13,755 |   |                                  |   | 13,671 |   |   |   | 13,767 |   |   |   | 13,658 |   |
| Net                income per share                               |   | $                                     | 0.33   |   |                                  | $      | 0.44 |   |   | $ | 0.65 |   |   | $ | 0.80 |   |
|                                                              |   |                                  |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| DILUTED:                                                          |   |                                  |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Net                income                                         |   | $                                     | 4,501  |   |                                  | $      | 5,996 |   |   | $ | 8,974 |   |   | $ | 10,912 |   |
| Weighted                average shares outstanding for the period |   |                                  | 13,755 |   |                                  |   | 13,671 |   |   |   | 13,767 |   |   |   | 13,658 |   |
| Dilutive                effect of stock options                   |   |                                  | 232    |   |                                  |   | 318 |   |   |   | 232 |   |   |   | 342 |   |
| Total                                                             |   |                                  | 13,987 |   |                                  |   | 13,989 |   |   |   | 13,999 |   |   |   | 14,000 |   |
| Net                income per share                               |   | $                                     | 0.32   |   |                                  | $      | 0.43 |   |   | $ | 0.64 |   |   | $ | 0.78 |   |

**Note      7 – Commitments and Contingencies**

*Guarantor’s Accounting and Disclosure      Requirements for Guarantees, Including Indirect Guarantees of Indebtedness      of      Others,*

***Indemnification***

----

**SUPERTEX,          INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS (CONTINUED)**

**(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 September 29, 2007 |   |                                              |   |   |            |   |   |                                         |   |   |                                        |   |
| Allowance                for sales returns           |   | $                                                 | 165    |   |            | $      | 137    |                                         |   | $      | (158                                        | )      |   | $ | 144 |   |
|                                                 |   |                                              |   |   |            |   |   |                                         |   |   |                                        |   |   |   |   |   |
| Three                months ended September 30, 2006 |   |                                              |   |   |            |   |   |                                         |   |   |                                        |   |   |   |   |   |
| Allowance                for sales returns           |   | $                                                 | 462    |   |            | $      | 523    |                                         |   | $      | (488                                        | )      |   | $ | 497 |   |
|                                                 |   |                                              |   |   |            |   |   |                                         |   |   |                                        |   |   |   |   |   |
| Six                months ended September 29, 2007   |   |                                              |   |   |            |   |   |                                         |   |   |                                        |   |   |   |   |   |
| Allowance                for sales returns           |   | $                                                 | 199    |   |            | $      | 512    |                                         |   | $      | (567                                        | )      |   | $ | 144 |   |
|                                                 |   |                                              |   |   |            |   |   |                                         |   |   |                                        |   |   |   |   |   |
| Six                months ended September 30, 2006   |   |                                              |   |   |            |   |   |                                         |   |   |                                        |   |   |   |   |   |
| Allowance                for sales returns           |   | $                                                 | 525    |   |            | $      | 676    |                                         |   | $      | (704                                        | )      |   | $ | 497 |   |

*(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 (CONTINUED)**

**(unaudited)**

***Operating      Lease Obligations***

*in      thousands*

| **Payment                Due by Year** |   | **Operating                Lease** |   |   | **Estimated                Sublease Income** |   |
|----------------------------------------|--------|------------------------------------|--------|--------|----------------------------------------------|--------|
| Less                than 1 year        |   | $                                  | 1,098  |   |                                         | $      | 52 |   |
| 2                years                 |   |                               | 1,081  |   |                                         |   | - |   |
| 3                years                 |   |                               | 998    |   |                                         |   | - |   |
| 4                years                 |   |                               | 563    |   |                                         |   | - |   |
|                                   |   | $                                  | 3,740  |   |                                         | $      | 52 |   |

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

|                                        |   | **Three                Months Ended** |   |   | **Six                Months Ended**   |   |
|---------------------------------------------|--------|---------------------------------------|--------|--------|---------------------------------------|--------|
|                                        |   | **September                29, 2007** |   |   | **September                30, 2006** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |
| Number                of shares repurchased |   |                                  | 100    |   |                                  |   | 35,000 |   |   |   | 104,800 |   |   |   | 35,000 |   |
| Cost                of shares repurchased   |   | $                                     | 4,000  |   |                                  | $      | 1,107,000 |   |   | $ | 3,249,000 |   |   | $ | 1,107,000 |   |
| Average                price per share      |   | $                                     | 34.97  |   |                                  | $      | 31.62 |   |   | $ | 31.00 |   |   | $ | 31.62 |   |

----

**SUPERTEX,          INC.**

**NOTES            TO CONDENSED CONSOLIDATED FINANCIAL            STATEMENTS (CONTINUED)**

**(unaudited)**

**Note      9 – Segment Information**

*(in      thousands):*

|                                              |   | **Three                Months Ended** |   |   | **Six                Months Ended**   |   |
|---------------------------------------------------|--------|---------------------------------------|--------|--------|---------------------------------------|--------|
| **Net                Sales**                      |   | **September                29, 2007** |   |   | **September                30, 2006** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |
| Asia                (excluding China & Japan) |   | $                                     | 4,362  |   |                                  | $      | 4,502 |   |   | $ | 8,084 |   |   | $ | 8,069 |   |
| China                                             |   |                                  | 5,377  |   |                                  |   | 8,384 |   |   |   | 9,890 |   |   |   | 16,884 |   |
| Japan                                             |   |                                  | 1,929  |   |                                  |   | 2,035 |   |   |   | 4,140 |   |   |   | 3,985 |   |
| Europe                                            |   |                                  | 2,936  |   |                                  |   | 3,981 |   |   |   | 5,505 |   |   |   | 6,400 |   |
| United                States                      |   |                                  | 7,220  |   |                                  |   | 7,361 |   |   |   | 14,804 |   |   |   | 14,888 |   |
| Other                                             |   |                                  | 205    |   |                                  |   | 258 |   |   |   | 368 |   |   |   | 860 |   |
| Net                Sales                          |   | $                                     | 22,029 |   |                                  | $      | 26,521 |   |   | $ | 42,791 |   |   | $ | 51,086 |   |

*(in      thousands):*

| **Country**                  |   | **September                29, 2007** |   |   | **March                31, 2007** |   |
|------------------------------|--------|---------------------------------------|--------|--------|-----------------------------------|--------|
| United                States |   | $                                     | 8,929  |   |                              | $      | 7,516 |   |
| Hong                Kong     |   |                                  | 1,329  |   |                              |   | 1,135 |   |
|                         |   | $                                     | 10,258 |   |                              | $      | 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 third 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)      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 second half of fiscal 2008; (5) R&D expenses in      absolute dollars are expected to be lower sequentially; (6) 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, 2003 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  ; (7) that we expect to spend approximately      $5,400,000  for capital acquisitions during fiscal year 2008; (8) our      belief that we have substantial production capacity in place to handle any      projected increase in business in fiscal 2008; (9) 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; (10) our belief that a significant change in      interest rates would minimally impact interest income the fair value of our      investments; (11) our belief that our exposure to foreign currency exchange      risks is relatively small; and (12) our growth strategy relying on continuous      introduction of new products and technologies.*

*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; and that some of the Company’s equipment will not be      unexpectedly damaged or obsoleted, thereby requiring replacement; 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** |   |   | **Six                Months Ended** |   |
|------------------------------------|--------|---------------------------------------|--------|--------|-------------------------------------|--------|
| **Net                Sales**       |   | **September                29, 2007** |   |   | **June                30, 2007**    |   |   | **September                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| Medical                Electronics |   | $                                     | 7,990  |   |                                | $      | 8,210 |   |   | $ | 8,077 |   |   |   | -3 | % |   |   | -1 | % |   | $ | 16,200 |   |   | $ | 15,221 |   |   |   | 6 | % |
| Imaging                            |   |                                  | 7,400  |   |                                |   | 6,209 |   |   |   | 11,331 |   |   |   | 19 | % |   |   | -35 | % |   |   | 13,609 |   |   |   | 21,938 |   |   |   | -38 | % |
| Industrial/Other                   |   |                                  | 2,968  |   |                                |   | 3,925 |   |   |   | 5,091 |   |   |   | -24 | % |   |   | -42 | % |   |   | 6,893 |   |   |   | 9,453 |   |   |   | -27 | % |
| Telecom                            |   |                                  | 2,178  |   |                                |   | 1,545 |   |   |   | 1,794 |   |   |   | 41 | % |   |   | 21 | % |   |   | 3,723 |   |   |   | 4,051 |   |   |   | -8 | % |
| LED                Lighting        |   |                                  | 1,493  |   |                                |   | 873 |   |   |   | 228 |   |   |   | 71 | % |   |   | 555 | % |   |   | 2,366 |   |   |   | 423 |   |   |   | 459 | % |
| Net                Sales           |   | $                                     | 22,029 |   |                                | $      | 20,762 |   |   | $ | 26,521 |   |   |   | 6 | % |   |   | -17 | % |   | $ | 42,791 |   |   | $ | 51,086 |   |   |   | -16 | % |

|                               |   | **Three                Months Ended** |   |   | **Six                Months Ended** |   |
|------------------------------------|--------|---------------------------------------|--------|--------|-------------------------------------|--------|
| **Net                Sales**       |   | **September                29, 2007** |   |   | **June                30, 2007**    |   |   | **September                30, 2006** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |
| Medical                Electronics |   |                                  | 36     | %      |                                |   | 40 | % |   |   | 30 | % |   |   | 38 | % |   |   | 30 | % |
| Imaging                            |   |                                  | 34     | %      |                                |   | 30 | % |   |   | 43 | % |   |   | 32 | % |   |   | 43 | % |
| Industrial/Other                   |   |                                  | 13     | %      |                                |   | 19 | % |   |   | 19 | % |   |   | 16 | % |   |   | 18 | % |
| Telecom                            |   |                                  | 10     | %      |                                |   | 7 | % |   |   | 7 | % |   |   | 9 | % |   |   | 8 | % |
| LED                Lighting        |   |                                  | 7      | %      |                                |   | 4 | % |   |   | 1 | % |   |   | 5 | % |   |   | 1 | % |
| Net                Sales           |   |                                  | 100    | %      |                                |   | 100 | % |   |   | 100 | % |   |   | 100 | % |   |   | 100 | % |

----

*(in thousands):*

----

|                                              |   | **Three                Months Ended**       |   |   | **Six                Months Ended**    |   |
|---------------------------------------------------|--------|---------------------------------------------------------------------------|--------|--------|-------------------------------------------------------|--------|
| **Net                Sales**                      |   | **September                29, 2007**                                     |   |   | **June                30, 2007**                      |   |   | **September                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| Asia                (excluding China & Japan) |   | $                                                                         | 4,362  |   |                                                  | $      | 3,722 |   |   | $ | 4,502 |   |   |   | 17 | % |   |   | -3 | % |   | $ | 8,084 |   |   | $ | 8,069 |   |   |   | 0 | % |
| China                                             |   |                                                                      | 5,377  |   |                                                  |   | 4,513 |   |   |   | 8,384 |   |   |   | 19 | % |   |   | -36 | % |   |   | 9,890 |   |   |   | 16,884 |   |   |   | -41 | % |
| Japan                                             |   |                                                                      | 1,929  |   |                                                  |   | 2,211 |   |   |   | 2,035 |   |   |   | -13 | % |   |   | -5 | % |   |   | 4,140 |   |   |   | 3,985 |   |   |   | 4 | % |
| Europe                                            |   |                                                                      | 2,936  |   |                                                  |   | 2,569 |   |   |   | 3,981 |   |   |   | 14 | % |   |   | -26 | % |   |   | 5,505 |   |   |   | 6,400 |   |   |   | -14 | % |
| United                States                      |   |                                                                      | 7,220  |   |                                                  |   | 7,584 |   |   |   | 7,361 |   |   |   | -5 | % |   |   | -2 | % |   |   | 14,804 |   |   |   | 14,888 |   |   |   | -1 | % |
| Other                                             |   |                                                                      | 205    |   |                                                  |   | 163 |   |   |   | 258 |   |   |   | 26 | % |   |   | -21 | % |   |   | 368 |   |   |   | 860 |   |   |   | -57 | % |
| Net                Sales                          |   | $                                                                         | 22,029 |   |                                                  | $      | 20,762 |   |   | $ | 26,521 |   |   |   | 6 | % |   |   | -17 | % |   | $ | 42,791 |   |   | $ | 51,086 |   |   |   | -16 | % |
|                                              |   |                                                                      |   |   |                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| International                Sales                |   | $                                                                         | 14,809 |   |                                                  | $      | 13,178 |   |   | $ | 19,160 |   |   |   | 12 | % |   |   | -23 | % |   | $ | 27,987 |   |   | $ | 36,198 |   |   |   | -23 | % |
| Domestic                Sales                     |   |                                                                      | 7,220  |   |                                                  |   | 7,584 |   |   |   | 7,361 |   |   |   | -5 | % |   |   | -2 | % |   |   | 14,804 |   |   |   | 14,888 |   |   |   | -1 | % |
| Net                Sales                          |   | $                                                                         | 22,029 |   |                                                  | $      | 20,762 |   |   | $ | 26,521 |   |   |   | 6 | % |   |   | -17 | % |   | $ | 42,791 |   |   | $ | 51,086 |   |   |   | -16 | % |

***Gross      Profit***

----

|                                                                                              |   | **Three                Months Ended** |   |   | **Six                Months Ended** |   |
|---------------------------------------------------------------------------------------------------|--------|---------------------------------------|--------|--------|-------------------------------------|--------|
| *(Dollars                in thousands)*                                                           |   | **September                29, 2007** |   |   | **June                30, 2007**    |   |   | **September                30, 2006** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |
| Gross                Margin Percentage                                                            |   |                                  | 59     | %      |                                |   | 61 | % |   |   | 61 | % |   |   | 60 | % |   |   | 61 | % |
| *Included                in Gross Margin Percentage Above*                                        |   |                                  |   |   |                                |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Gross                Margin Benefit from Sale of Previously Written Down                Inventory |   | $                                     | 380    |   |                                | $      | 398 |   |   | $ | 434 |   |   | $ | 778 |   |   | $ | 950 |   |
| Percentage                of Net Sales                                                            |   |                                  | 2      | %      |                                |   | 2 | % |   |   | 2 | % |   |   | 2 | % |   |   | 2 | % |

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

|                                    |   | **Three                Months Ended** |   |   | **Six                Months Ended** |   |
|-----------------------------------------|--------|---------------------------------------|--------|--------|-------------------------------------|--------|
| *(Dollars                in thousands)* |   | **September                29, 2007** |   |   | **June                30, 2007**    |   |   | **September                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| R&D                Expenses         |   | $                                     | 3,858  |   |                                | $      | 3,765 |   |   | $ | 3,658 |   |   |   | 2 | % |   |   | 5 | % |   | $ | 7,623 |   |   | $ | 7,607 |   |   |   | 0 | % |
| Percentage                of Net Sales  |   |                                  | 18     | %      |                                |   | 18 | % |   |   | 14 | % |   |   |   |   |   |   |   |   |   |   | 18 | % |   |   | 15 | % |   |   |   |   |

----

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

|                                    |   | **Three                Months Ended** |   |   | **Six                Months Ended** |   |
|-----------------------------------------|--------|---------------------------------------|--------|--------|-------------------------------------|--------|
| *(Dollars                in thousands)* |   | **September                29, 2007** |   |   | **June                30, 2007**    |   |   | **September                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| SG&A                Expenses        |   | $                                     | 4,192  |   |                                | $      | 3,646 |   |   | $ | 3,826 |   |   |   | 15 | % |   |   | 10 | % |   | $ | 7,838 |   |   | $ | 7,629 |   |   |   | 3 | % |
| Percentage                of Net Sales  |   |                                  | 19     | %      |                                |   | 18 | % |   |   | 14 | % |   |   |   |   |   |   |   |   |   |   | 18 | % |   |   | 15 | % |   |   |   |   |

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

|                                                 |   | **Three                Months Ended** |   |   | **Six                Months Ended** |   |
|------------------------------------------------------|--------|---------------------------------------|--------|--------|-------------------------------------|--------|
| *(Dollars                in thousands)*              |   | **September                29, 2007** |   |   | **June                30, 2007**    |   |   | **September                30, 2006** |   |   | **Sequential                Change** |   |   | **Year-Over-Year                Change** |   |   | **September                29, 2007** |   |   | **September                30, 2006** |   |   | **Year-Over-Year                Change** |   |
| Interest                Income and Other Income, Net |   | $                                     | 1,587  |   |                                | $      | 1,507 |   |   | $ | 968 |   |   |   | 5 | % |   |   | 64 | % |   | $ | 3,094 |   |   | $ | 2,256 |   |   |   | 37 | % |
| Percentage                of Net Sales               |   |                                  | 7      | %      |                                |   | 7 | % |   |   | 4 | % |   |   |   |   |   |   |   |   |   |   | 7 | % |   |   | 4 | % |   |   |   |   |

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***Provision      for Income Taxes***

**Financial      Condition**

***Overview***

----

***Liquidity      and Capital Resources***

|                                                               |   | **Six                Months Ended**   |   |
|--------------------------------------------------------------------|--------|---------------------------------------|--------|
| *(Dollars                in thousands)*                            |   | **September                29, 2007** |   |   | **September                30, 2006** |   |
| Net                cash provided by operating activities           |   | $                                     | 8,016  |   |   | $ | 14,063 |   |
| Net                cash used in investing activities               |   |                                  | (6,395 | ) |   |   | (22,167 | ) |
| Net                cash provided by (used in) financing activities |   |                                  | (1,643 | ) |   |   | 1,309 |   |
| Net                decrease in cash and cash equivalents           |   | $                                     | (22    | ) |   | $ | (6,795 | ) |

***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)    |   | $                                      | 3,740  |   |   | $ | 1,098 |   |   | $ | 1,081 |   |   | $ | 998 |   |   | $ | 563 |   |
| Purchase                obligations (2)           |   |                                   | 7,568  |   |   |   | 6,696 |   |   |   | 803 |   |   |   | 40 |   |   |   | 29 |   |
| Total                contractual cash obligations |   | $                                      | 11,308 |   |   | $ | 7,794 |   |   | $ | 1,884 |   |   | $ | 1,038 |   |   | $ | 592 |   |

|   | *(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 September 29, 2007, amounted to                $243,000.* |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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

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*.*

***Recent      Accounting Pronouncements***

*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 *

***Available      Information***

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

***Interest      Rate Risk***

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***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** |   |
|------------------------------------|--------|---------------------------------------------------------|-------------|--------|-------------------------------------------------|--------|-----------|-----------------------------------------------------------------------------------------------------------------------|--------|------------|------------------------------------------------------------------------------------------------------------------|--------|
| 04/01/07-                04/28/07  |   |                                                    | -           |   |                                            |   | -         |                                                                                                                  |   |       | -                                                                                                                |   |   |   | 729,100 |   |
| 04/29/07-                05/26/07  |   |                                                    | 104,700     |   |                                            | $      | 31.00     |                                                                                                                  |   |       |  -                                                                                                          |   |   |   | 624,400 |   |
| 05/27/07-                06/30/07  |   |                                                    | -           |   |                                            |   | -         |                                                                                                                  |   |       | -                                                                                                                |   |   |   | 624,400 |   |
| 07/01/07                - 07/28/07 |   |                                                    | -           |   |                                            |   | -         |                                                                                                                  |   |       | -                                                                                                                |   |   |   | 624,400 |   |
| 07/29/07                - 08/25/07 |   |                                                    | 100         |   |                                            |   | 34.97     |                                                                                                                  |   |       | -                                                                                                                |   |   |   | 624,300 |   |
| 08/26/07                - 09/29/07 |   |                                                    | -           |   |                                            |   | -         |                                                                                                                  |   |       | -                                                                                                                |   |   |   | 624,300 |   |
| **Total**                          |   | ** **                                              | **104,800** |   |                                            | **$**  | **31.00** |                                                                                                                  |   | ** ** | **-**                                                                                                            |   |   | ** ** | **624,300** |   |

| *(1)  * | *Our                current share repurchase program, under which we repurchased these                104,800                shares during the six months ended September 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 104,800  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.                Neither this program nor any other repurchase program or plan has                expired                during the second fiscal quarter ended September 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.* |
|-------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

**Item      3.  Defaults Upon Senior Securities**

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

|                                                                                                                                         |   | **Votes                For** |       |   | **Votes                Against** |   |   | **Votes                Withheld/ Abstentions** |   |   | **Broker                Non-Votes** |   |
|----------------------------------------------------------------------------------------------------------------------------------------------|--------|------------------------------|------------|--------|----------------------------------|--------|--------|------------------------------------------------|--------|--------|-------------------------------------|--------|
|                                                                                                                                         |   |                         |       |   |                             |   |   |                                           |   |   |                                |   |
|     1.             Election                of Directors |   |                         |       |   |                             |   |   |                                           |   |   |                                |   |
|                                                                                                                                         |   |                         |       |   |                             |   |   |                                           |   |   |                                |   |
| Henry                C. Pao                                                                                                                  |   |                         | 12,790,188 |   |                             |   | 0      |                                           |   |   | 80,016                              |   |   |   | 0 |   |
| Benedict                C.K. Choy                                                                                                            |   |                         | 12,322,002 |   |                             |   | 0      |                                           |   |   | 548,202                             |   |   |   | 0 |   |
| W.                Mark Loveless                                                                                                              |   |                         | 12,668,255 |   |                             |   | 0      |                                           |   |   | 201,949                             |   |   |   | 0 |   |
| Elliott                Schlam                                                                                                                |   |                         | 12,668,255 |   |                             |   | 0      |                                           |   |   | 201,949                             |   |   |   | 0 |   |
| Milton                Feng                                                                                                                   |   |                         | 12,667,737 |   |                             |   | 0      |                                           |   |   | 202,467                             |   |   |   | 0 |   |

|   |  2.            Proposal                to ratify the appointment of PricewaterhouseCoopers LLP as the independent                registered public accounting firm of the Company for the fiscal year                ending March 30, 2008.  |
|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | **Votes                For** | **Votes                Against** | **Abstentions** | **Broker                Non-Votes** |
|--------|------------------------------|----------------------------------|-----------------|-------------------------------------|
|   |                         |                             |            |                                |
|   | 12,862,346                   | 7,538                            | 320             | 0                                   |

**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)*

----

**Exhibit      31.1**

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

----

**Exhibit      31.2**

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

----

**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                September 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. |
|--------|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

*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                September 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. |
|--------|------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

*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.*

----