-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 IRg7pyxlVis+KM02CQqf1wWS6D3VuQYqLCQD7yFWbMsfZJa1rJmGpih0llafZyo3
 jtHPhGfc8Vth14ttC9nArw==

<SEC-DOCUMENT>0001209191-09-038999.txt : 20090804
<SEC-HEADER>0001209191-09-038999.hdr.sgml : 20090804
<ACCEPTANCE-DATETIME>20090804193452
ACCESSION NUMBER:		0001209191-09-038999
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20090731
FILED AS OF DATE:		20090804
DATE AS OF CHANGE:		20090804

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LANZA LUCIO
		CENTRAL INDEX KEY:			0001218982

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31311
		FILM NUMBER:		09985293

	MAIL ADDRESS:	
		STREET 1:		141 CASPIAN COURT
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94089

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PDF SOLUTIONS INC
		CENTRAL INDEX KEY:			0001120914
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING SERVICES [7371]
		IRS NUMBER:				251701361
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		333 WEST SAN CARLOS STREET
		STREET 2:		SUITE 700
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95110
		BUSINESS PHONE:		4082807900

	MAIL ADDRESS:	
		STREET 1:		333 WEST SAN JOSE STREET
		STREET 2:		SUITE 700
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95110
</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>2009-07-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001120914</issuerCik>
        <issuerName>PDF SOLUTIONS INC</issuerName>
        <issuerTradingSymbol>PDFS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001218982</rptOwnerCik>
            <rptOwnerName>LANZA LUCIO</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>165 UNIVERSITY AVE.</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 200</rptOwnerStreet2>
            <rptOwnerCity>PALO ALTO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94301</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>2001 Stock Plan Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>2.30</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2009-07-31</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>45000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-07-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>45000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>45000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">12/48ths of the total shares subject to the option (the &quot;Total Shares&quot;) vest on July 31, 2010 and 1/48th of the Total Shares shall vest on the 31st day of each month thereafter, provided that the reporting person continues to serve as a director on the Board of Directors.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Keith A. Jones, Substitute Attorney-in-Fact for Lucio L. Lanza</signatureName>
        <signatureDate>2009-08-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24.4_295999
<SEQUENCE>2
<FILENAME>poa.txt
<DESCRIPTION>POA DOCUMENT
<TEXT>
CONFIRMING STATEMENT

	I, John K. Kibarian, (the "Attorney-in-Fact"), by virtue of the authority and
the full power of substitution given to me by Lucio Lanza(the "Section 16
Reporting Person") in and by the Power of Attorney previously executed by the
Section 16 Reporting Person (the "Power of Attorney"), do hereby appoint Joy E.
Leo and Keith A. Jones, or either of them signing singly, as the
Attorney-in-Fact's substitute (each a "Substitute Attorney-in-Fact") to exercise
all of the Attorney-in-Fact's powers provided for in the Power of Attorney,
including full power and authority to do and perform each and every act
requisite, necessary or convenient to be done in connection with such powers, as
fully, to all intents and purposes, as the Attorney-in-Fact might or could do
thereby.

	This Confirming Statement shall remain in full force and effect until the
earlier of (i) the Section 16 Reporting Person is no longer required to file
Forms 4 and 5 with respect to holdings of and transactions in securities issued
by PDF Solutions, Inc. (the "Company") (unless the Power of Attorney executed by
the Section 16 Reporting Person is earlier revoked by them in a signed writing
delivered to the Attorney-in-Fact), (ii) the Attorney-in-Fact terminates the
appointment of the Substitute Attorney-in-Fact or (iii) the
Substitute Attorney-in-Fact ceases to be an employee of the Company.

	IN WITNESS WHEREOF, the undersigned has caused this Confirming Statement to be
executed as of this  15th day of May, 2009.

    /s/ John K. Kibarian
__________________________________
JOHN K. KIBARIAN, Attorney-in-Fact
for Lucio Lanza

</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
