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  <xsd:element id="smtc_NumberofWeeksinReportingPeriod" name="NumberofWeeksinReportingPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_Numberofweeksforthefourthquarterfora53weekfiscalyear" name="Numberofweeksforthefourthquarterfora53weekfiscalyear" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_OrganizationAndBasisOfPresentationLineItems" name="OrganizationAndBasisOfPresentationLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_OrganizationAndBasisOfPresentationTable" name="OrganizationAndBasisOfPresentationTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_OtherWarrantSharesMember" name="OtherWarrantSharesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_PercentageofEquityInterestinDirectandIndirectNonU.S.SubsidiariesThatAreIncludedAsPledgedAssets" name="PercentageofEquityInterestinDirectandIndirectNonU.S.SubsidiariesThatAreIncludedAsPledgedAssets" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="smtc_Percentageofuncertaintaxpositionsevaluatingcriteria" name="Percentageofuncertaintaxpositionsevaluatingcriteria" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_PremierTechnicalSalesKoreaInc.AndAffiliatesMember" name="PremierTechnicalSalesKoreaInc.AndAffiliatesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_ProductDevelopmentAndEngineeringMember" name="ProductDevelopmentAndEngineeringMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_ProtectionMember" name="ProtectionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_RestrictedDeposits" name="RestrictedDeposits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="smtc_RevenueOffset" name="RevenueOffset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="smtc_RevenuefromContractwithCustomerRevenueOffset" name="RevenuefromContractwithCustomerRevenueOffset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_SamsungElectronicsAndAffiliatesMember" name="SamsungElectronicsAndAffiliatesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_ScheduleOfFinitelivedIntangibleAssetsAcquiredTableTextBlock" name="ScheduleOfFinitelivedIntangibleAssetsAcquiredTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_ScheduleofRevenuefromExternalCustomersbySalesChannelTableTextBlock" name="ScheduleofRevenuefromExternalCustomersbySalesChannelTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_SellUSDBuyCADForwardContractMember" name="SellUSDBuyCADForwardContractMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_SellUSDBuyGBPForwardContractMember" name="SellUSDBuyGBPForwardContractMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_SemiconductorProductsGroupMember" name="SemiconductorProductsGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPerformancePeriod" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPerformancePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_SharebasedCompensationArrangementbySharebasedPaymentAwardPlanModificationNumberofSharesAffected" name="SharebasedCompensationArrangementbySharebasedPaymentAwardPlanModificationNumberofSharesAffected" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_SignalIntegrityMember" name="SignalIntegrityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_StockRepurchaseProgramAuthorizedAmountIncreaseDuringthePeriod" name="StockRepurchaseProgramAuthorizedAmountIncreaseDuringthePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_StockRepurchaseProgramWIthNoExpirationDateMember" name="StockRepurchaseProgramWIthNoExpirationDateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_SummaryOfSalesActivityToCountriesThatRepresentedGreaterThan10OfTotalNetSalesTableTextBlock" name="SummaryOfSalesActivityToCountriesThatRepresentedGreaterThan10OfTotalNetSalesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_SwinglineLoansMember" name="SwinglineLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense" name="TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="smtc_TotalLeverageRatio" name="TotalLeverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element id="smtc_TotalLeverageRatioFollowingAMaterialAcquisition" name="TotalLeverageRatioFollowingAMaterialAcquisition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_TrendTekTechnologyLtdAndAffiliatesMember" name="TrendTekTechnologyLtdAndAffiliatesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="smtc_WirelessandSensingMember" name="WirelessandSensingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
