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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Bce2DW83xX8GVGZBxnZC7Y4Vq9AUcd3fE8ZR0riZBJG8CoNOxmXdmjjy+K5XydwL
 hGOImcH+n6PTELKaW7t15g==

<SEC-DOCUMENT>0000922423-05-000855.txt : 20050516
<SEC-HEADER>0000922423-05-000855.hdr.sgml : 20050516
<ACCEPTANCE-DATETIME>20050516183305
ACCESSION NUMBER:		0000922423-05-000855
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050513
FILED AS OF DATE:		20050516
DATE AS OF CHANGE:		20050516

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BACILE NICK
		CENTRAL INDEX KEY:			0001257039

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-03698
		FILM NUMBER:		05836623

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		408 567 8160

	MAIL ADDRESS:	
		STREET 1:		VISHAY SILICONIX
		STREET 2:		2201 LAURELWOOD ROAD
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95054

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SILICONIX INC
		CENTRAL INDEX KEY:			0000090283
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				941527868
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2201 LAURELWOOD RD
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95056
		BUSINESS PHONE:		4089888000

	MAIL ADDRESS:	
		STREET 1:		2201 LAURELWOOD RD
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95056
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>kl00545_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2005-05-13</periodOfReport>

    <dateOfOriginalSubmission>2005-05-16</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000090283</issuerCik>
        <issuerName>SILICONIX INC</issuerName>
        <issuerTradingSymbol>SILI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001257039</rptOwnerCik>
            <rptOwnerName>BACILE NICK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2201 LAURELWOOD ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SANTA CLARA,</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95054</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-05-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>45</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person sold 45 shares of the issuer in exchange for 138 shares (and cash representing a fractional share) of
Vishay Intertechnology, Inc., a Delaware Corporation, at an exchange ratio of 3.075 per share. This Amendment corrects the
footnote in the original filing, which incorrectly stated the number of shares the reporting person sold and the number of
Vishay Intertechnology, Inc. shares the reporting person received in exchange.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Nick Bacile</signatureName>
        <signatureDate>2005-05-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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