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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 PlEb/07U50D0B5xLBU0vgglEBXlmj4DWm2ZuDJfn2sXcwlZE8vq6rfSt26m0jJqW
 Uoc+zaXaUXq4omCumX6OFA==

<SEC-DOCUMENT>0001005477-05-003386.txt : 20050928
<SEC-HEADER>0001005477-05-003386.hdr.sgml : 20050928
<ACCEPTANCE-DATETIME>20050928164535
ACCESSION NUMBER:		0001005477-05-003386
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050926
FILED AS OF DATE:		20050928
DATE AS OF CHANGE:		20050928

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			STANDARD MICROSYSTEMS CORP
		CENTRAL INDEX KEY:			0000093384
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				112234952
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0806

	BUSINESS ADDRESS:	
		STREET 1:		80 ARKAY DRIVE
		CITY:			HAUPPAUGE
		STATE:			NY
		ZIP:			11788
		BUSINESS PHONE:		6314342904

	MAIL ADDRESS:	
		STREET 1:		80 ARKAY DR
		CITY:			HAUPPAUGE
		STATE:			NY
		ZIP:			11788

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Tan Johnson C
		CENTRAL INDEX KEY:			0001335297

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-07422
		FILM NUMBER:		051108645

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		631-435-6886

	MAIL ADDRESS:	
		STREET 1:		C/O STANDARD MICROSYSTEMS CORPORATION
		STREET 2:		80 ARKAY DRIVE
		CITY:			HAUPPAUGE
		STATE:			NY
		ZIP:			11788
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar123.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-09-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000093384</issuerCik>
        <issuerName>STANDARD MICROSYSTEMS CORP</issuerName>
        <issuerTradingSymbol>SMSC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001335297</rptOwnerCik>
            <rptOwnerName>Tan Johnson C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>80 ARKAY DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>HAUPPAUGE</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>11788</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-09-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>253</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3656</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1047</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trust</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Held in Incentive Savings and Retirement Plan as of 09/26/05.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Michael LaBosco (as Attorney-in-Fact)</signatureName>
        <signatureDate>2005-09-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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