<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001994152</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000088941</issuerCik>
      <issuerName>SEMTECH CORP</issuerName>
      <secFileNumber>001-06395</secFileNumber>
      <issuerAddress>
        <com:street1>200 FLYNN ROAD</com:street1>
        <com:city>CAMARILLO</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>93012-8790</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>8054982111</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Lin Mark</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>900 Salem Street</com:street1>
          <com:city>Smithfield</com:city>
          <com:stateOrCountry>RI</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>9186</noOfUnitsSold>
      <aggregateMarketValue>689409.30</aggregateMarketValue>
      <noOfUnitsOutstanding>92951167</noOfUnitsOutstanding>
      <approxSaleDate>03/24/2026</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/23/2026</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>9186</amountOfSecuritiesAcquired>
      <paymentDate>03/23/2026</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark Lin</name>
        <address>
          <com:street1>200 Flynn Road</com:street1>
          <com:city>Camarillo</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>93012-8790</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>01/05/2026</saleDate>
      <amountOfSecuritiesSold>1333</amountOfSecuritiesSold>
      <grossProceeds>101574.60</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark Lin</name>
        <address>
          <com:street1>200 Flynn Road</com:street1>
          <com:city>Camarillo</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>93012-8790</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/06/2026</saleDate>
      <amountOfSecuritiesSold>6582</amountOfSecuritiesSold>
      <grossProceeds>551242.50</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark Lin</name>
        <address>
          <com:street1>200 Flynn Road</com:street1>
          <com:city>Camarillo</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>93012-8790</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/10/2026</saleDate>
      <amountOfSecuritiesSold>2734</amountOfSecuritiesSold>
      <grossProceeds>233128.18</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Mark Lin</name>
        <address>
          <com:street1>200 Flynn Road</com:street1>
          <com:city>Camarillo</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>93012-8790</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>03/11/2026</saleDate>
      <amountOfSecuritiesSold>3908</amountOfSecuritiesSold>
      <grossProceeds>340933.92</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>03/24/2026</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>06/23/2025</planAdoptionDate>
      </planAdoptionDates>
      <signature>/s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark Lin</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
