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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001209191-08-047818.txt : 20080818
<SEC-HEADER>0001209191-08-047818.hdr.sgml : 20080818
<ACCEPTANCE-DATETIME>20080818145002
ACCESSION NUMBER:		0001209191-08-047818
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080817
FILED AS OF DATE:		20080818
DATE AS OF CHANGE:		20080818

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COHU INC
		CENTRAL INDEX KEY:			0000021535
		STANDARD INDUSTRIAL CLASSIFICATION:	INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS [3825]
		IRS NUMBER:				951934119
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		12367 CROSTHWAITE CIRCLE
		CITY:			POWAY
		STATE:			CA
		ZIP:			92064-6817
		BUSINESS PHONE:		858-848-8100

	MAIL ADDRESS:	
		STREET 1:		12367 CROSTHWAITE CIRCLE
		CITY:			POWAY
		STATE:			CA
		ZIP:			92064-6817

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COHU ELECTRONICS INC
		DATE OF NAME CHANGE:	19720809

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			McFarlane James G
		CENTRAL INDEX KEY:			0001320725

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-04298
		FILM NUMBER:		081024897

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		858-848-8100

	MAIL ADDRESS:	
		STREET 1:		12367 CROSTHWAITE CIRCLE
		CITY:			POWAY
		STATE:			CA
		ZIP:			92064
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-08-17</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000021535</issuerCik>
        <issuerName>COHU INC</issuerName>
        <issuerTradingSymbol>COHU</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001320725</rptOwnerCik>
            <rptOwnerName>McFarlane James G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>12367 CROSTHWAITE CIRCLE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>POWAY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92064</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>2008-08-17</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>485</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>17.52</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>27282</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares that were automatically withheld from shares issued upon vesting of Restricted Stock Units (RSUs) to cover tax obligations in a transaction exempt under Rule 16(b)-3.</footnote>
        <footnote id="F2">Number of shares includes 7,375 Restricted Stock Units (RSU) (excluding the impact of shares that will be withheld to cover tax obligations) previously reported that in the future will be converted on a one-for-one basis into shares of Cohu, Inc. Common Stock, immediately upon vesting which vesting is scheduled to occur in three annual installments (assuming continued employment).</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Jeffrey D. Jones (Attorney-in-Fact)</signatureName>
        <signatureDate>2008-08-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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