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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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 xxvkWfFwQrc8/MAqmdCOdQ==

<SEC-DOCUMENT>0001242609-03-000056.txt : 20030818
<SEC-HEADER>0001242609-03-000056.hdr.sgml : 20030818
<ACCEPTANCE-DATETIME>20030818123840
ACCESSION NUMBER:		0001242609-03-000056
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030706
FILED AS OF DATE:		20030818

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INTERNATIONAL RECTIFIER CORP /DE/
		CENTRAL INDEX KEY:			0000316793
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				951528961
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0629

	BUSINESS ADDRESS:	
		STREET 1:		233 KANSAS ST
		CITY:			EL SEGUNDO
		STATE:			CA
		ZIP:			90245
		BUSINESS PHONE:		3107268000

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LIDOW ALEXANDER
		CENTRAL INDEX KEY:			0001242599

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-07935
		FILM NUMBER:		03852352

	BUSINESS ADDRESS:	
		STREET 1:		233 KANSAS STREET
		CITY:			EL SEGUNDO
		STATE:			CA
		ZIP:			90245
		BUSINESS PHONE:		3107268000

	MAIL ADDRESS:	
		STREET 1:		233 KANSAS STREET
		CITY:			EL SEGUNDO
		STATE:			CA
		ZIP:			90245
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>5</documentType><periodOfReport>2003-07-06</periodOfReport>
    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0000316793</issuerCik>
        <issuerName>INTERNATIONAL RECTIFIER CORP /DE/</issuerName>
        <issuerTradingSymbol>IRF</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001242599</rptOwnerCik>
            <rptOwnerName>LIDOW ALEXANDER</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>233 KANSAS STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>EL SEGUNDO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90245</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Chief Executive Officer</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>1221396</value><footnoteId id="F1"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable><derivativeHolding><securityTitle><value>Non-qualified Stock Options (Right to Buy)</value></securityTitle><conversionOrExercisePrice><value>28.9873</value><footnoteId id="F2"/></conversionOrExercisePrice><exerciseDate><value>1995-06-30</value><footnoteId id="F3"/></exerciseDate><expirationDate><value>2004-06-29</value><footnoteId id="F3"/>
</expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>1235000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>1235000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding></derivativeTable><footnotes><footnote id="F1">The above shareholding includes the following: 46 shares owned under the Company's 401(k) plan (as of 6/30/03); 16,400 shares owned by my wife, Janet Hart; 3,623 shares owned by my son, Nicholai; 58,758 shares I hold as custodian for my son, Nicholai; 20,481 shares I hold as custodian for my daughter, Haile; 900 shares my wife holds as custodian for my son, Nicholai; 1,800 shares my wife holds as custodian for my daughter, Haile; and 660 shares my wi
fe holds as custodian for her niece, Amber Hornsby.  I disclaim any beneficial interest in the above-mentioned shares owned by my wife, son or held by my wife or me as custodian.  In addition,the Lidow Foundation, of which I am a director, holds 126,879 shares; I disclaim any pecuniary interest in these shares.</footnote><footnote id="F2">This is an average exercise price for the outstanding stock options.</footnote><footnote id="F3">This is the earliest date for the outstanding stock optiosns.</footnote></footnotes><remarks/><ownerSignature><signatureName>Alexander Lidow</signatureName><signatureDate>2003-08-18</signatureDate></ownerSignature></ownershipDocument>

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