-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 S/jqN0KdryDJnURYGSySMQ2z6byK2Zn5XYq7pnEQ20mBYkbQBMV7inroCNYP1iH2
 BgxD4tFhKyStsPmWs7HAVg==

<SEC-DOCUMENT>0001195890-04-000009.txt : 20041022
<SEC-HEADER>0001195890-04-000009.hdr.sgml : 20041022
<ACCEPTANCE-DATETIME>20041022145158
ACCESSION NUMBER:		0001195890-04-000009
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041021
FILED AS OF DATE:		20041022
DATE AS OF CHANGE:		20041022

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CHOY BENEDICT C K
		CENTRAL INDEX KEY:			0001195890

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-12718
		FILM NUMBER:		041091636

	BUSINESS ADDRESS:	
		STREET 1:		1235 BORDEAUX DRIVE
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94089

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SUPERTEX INC
		CENTRAL INDEX KEY:			0000730000
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				942328535
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		1235 BORDEAUX DR
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94089
		BUSINESS PHONE:		4087440100

	MAIL ADDRESS:	
		STREET 1:		1235 BORDEAUX DR
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94089
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-10-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000730000</issuerCik>
        <issuerName>SUPERTEX INC</issuerName>
        <issuerTradingSymbol>SUPX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001195890</rptOwnerCik>
            <rptOwnerName>CHOY BENEDICT C K</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity></rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-10-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>20.65</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>215846</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">ISO Option Granted (to purchase common stock).  Price: $10.7500.  Shares granted: 45,000.  Shares exercisable: 18,000.  9,000 shares exercisable on 6/1/05.  9,000 shares exercisable on 6/1/06.  9,000 shares exercisable on 6/1/07.  Expiration date on 6/1/2008.  Held direct.</footnote>
        <footnote id="F2">NQ option (to purchase common stock).  Price: $10.7500.  Shares granted: 7,000.  Shares exercisable: 7,000.  Expiration date 6/1/05.  Held direct.</footnote>
        <footnote id="F3">NQ option (to purchase common stock).  Exercise price: $15.5000.  20,000 shares granted.  16,000 shares exercisable.  4,000 shares exercisable on 12/1/04.  Expiration date 12/1/06.  Held direct.</footnote>
        <footnote id="F4">NQ Option (to purchase common stock).  Exercise Price: $12.5300.  Shares granted: 20,000.  6,000 shares exercisable.  7,000 shares exercisable on 6/1/05.  7,000 shares exercisable on 6/1/06.  Expiration date: 6/1/08.  Held direct.</footnote>
        <footnote id="F5">ISO option (to purchase common stock).  Exercise price: $17.0600.  Shares granted: 10,000.  None exercisable currently.  5,000 shares exercisable on 9/1/08.  5,000 shares exercisable on 9/1/09.  Expiration date:  9/1/11.  Held direct.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Ben Choy</signatureName>
        <signatureDate>2004-10-22</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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