<SUBMISSION>
<ACCESSION-NUMBER>0001285081-05-000132
<TYPE>4
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20051213
<FILING-DATE>20051223
<DATE-OF-FILING-DATE-CHANGE>20051223
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>SILICON LABORATORIES INC
<CIK>0001038074
<ASSIGNED-SIC>3674
<IRS-NUMBER>742793174
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>4635 BOSTON LN
<CITY>AUSTIN
<STATE>TX
<ZIP>78735
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>4635 BOSTON LANE
<CITY>AUSTIN
<STATE>TX
<ZIP>78735
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>GAY GARY R
<CIK>0001197845
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4
<ACT>34
<FILE-NUMBER>000-29823
<FILM-NUMBER>051286085
</FILING-VALUES>
<BUSINESS-ADDRESS>
<PHONE>5124168500
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>4635 BOSTON LANE
<CITY>AUSTIN
<STATE>TX
<ZIP>78735
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
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<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

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    <periodOfReport>2005-12-13</periodOfReport>

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    <issuer>
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        <issuerName>SILICON LABORATORIES INC</issuerName>
        <issuerTradingSymbol>SLAB</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>GAY GARY R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>4635 BOSTON LANE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>AUSTIN</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>78735</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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            <transactionDate>
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            <underlyingSecurity>
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            <transactionDate>
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            <transactionTimeliness>
                <value>E</value>
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            <transactionAmounts>
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                <transactionPricePerShare>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, $0.0001 par value</value>
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                <underlyingSecurityShares>
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        <derivativeTransaction>
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                <value>Non-Qualified Stock Option (right to buy)</value>
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                <value>E</value>
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                <transactionShares>
                    <value>2839</value>
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                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <value>2012-06-13</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, $0.0001 par value</value>
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                <directOrIndirectOwnership>
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                <value>48.88</value>
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                <value>2005-12-13</value>
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                <transactionFormType>5</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <value>E</value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6932</value>
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                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <value>2002-10-16</value>
                <footnoteId id="F4"/>
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            <expirationDate>
                <value>2010-09-20</value>
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                <underlyingSecurityTitle>
                    <value>Common Stock, $0.0001 par value</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6931</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>6931</value>
                    <footnoteId id="F17"/>
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                <directOrIndirectOwnership>
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    <footnotes>
        <footnote id="F1">Transfer represents a pre-marital dissolutaion partition of community property.</footnote>
        <footnote id="F2">The Option becomes exercisable as it vests in a series of twelve (12) successive equal monthly installments measured from June 13, 2005.</footnote>
        <footnote id="F3">On December 13, 2005 options to acquire 285 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F4">The Option becomes exercisable as it vests in a series of thirty six  (36) successive equal monthly installments measured from October 16, 2002.</footnote>
        <footnote id="F5">On December 13, 2005 options to acquire 3,068 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F6">The Option becomes exercisable as it vests in a series of sixty (60) successive equal monthly installments measured from Marcc 16, 2001.</footnote>
        <footnote id="F7">On December 13, 2005 options to acquire 9,333 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F8">The Option becomes exercisable as it vests in a series of sixty (60) successive equal monthly installments measured from July 18, 2001.</footnote>
        <footnote id="F9">On December 13, 2005 options to acquire 8,667 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F10">Option vests and becomes exercisable with respect to (i) twenty percent (20%) of the option shares upon optionee's completion of one year of service measured from the grant date and (ii) the balance of the option shares in a series of forty-eight (48) successive monthly installments over the forty-eight (48) month period measured from the first year anniversary of the grant date.</footnote>
        <footnote id="F11">On December 13, 2005 options to acquire 3,750 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F12">On December 13, 2005 options to acquire 5,625 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F13">On December 13, 2005 options to acquire 9,000 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F14">The Option becomes exercisable as it vests in a series of twelve (12) successive equal monthly installments measured from October 24, 2005.</footnote>
        <footnote id="F15">On December 13, 2005 options to acquire 833 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F16">On December 13, 2005 options to acquire 2,839 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F17">On December 13, 2005 options to acquire 6,932 shares of common stock were transferred by the reporting person pursuant to a domestic relations order.</footnote>
        <footnote id="F18">Not applicable per instruction 4(c)(iii).</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Bruce A. Maurer, Power of Attorney for Gary R. Gay</signatureName>
        <signatureDate>2005-12-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
