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  <xsd:element id="sitm_CashPaidForCommissionRelatedParty" name="CashPaidForCommissionRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <xsd:element id="sitm_FiniteLivedIntangibleAssetsAmortizationExpenseYearFourAndAfterYearFour" name="FiniteLivedIntangibleAssetsAmortizationExpenseYearFourAndAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="sitm_IncreaseDecreaseInLeaseLiabilities" name="IncreaseDecreaseInLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <xsd:element id="sitm_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour" name="LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
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  <xsd:element id="sitm_NetIncomeLossAttributableToCommonStockholderAndComprehensiveIncomeLoss" name="NetIncomeLossAttributableToCommonStockholderAndComprehensiveIncomeLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="sitm_NumberOfCustomersAccountedForTenPercentageOrMoreOfRevenues" name="NumberOfCustomersAccountedForTenPercentageOrMoreOfRevenues" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="sitm_NumberOfDistributorsAccountedForTenPercentageOrMoreOfRevenues" name="NumberOfDistributorsAccountedForTenPercentageOrMoreOfRevenues" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
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  <xsd:element id="sitm_PercentageOfLongLivedAssets" name="PercentageOfLongLivedAssets" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="sitm_PrepaymentsToSuppliers" name="PrepaymentsToSuppliers" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="sitm_ProceedsFromIssuanceOfCommonStockNetOfUnderwritingDiscountsAndCommissions" name="ProceedsFromIssuanceOfCommonStockNetOfUnderwritingDiscountsAndCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <xsd:element id="sitm_InternalUseSoftwareMember" name="InternalUseSoftwareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="sitm_LiabilityBasedAwardsCashSettledMember" name="LiabilityBasedAwardsCashSettledMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="sitm_SecondHalfOfTwentyTwentyOneGoalsMember" name="SecondHalfOfTwentyTwentyOneGoalsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="sitm_OutbreakOfCoronavirusDiseaseTwentyNineteenPolicyTextBlock" name="OutbreakOfCoronavirusDiseaseTwentyNineteenPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
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  <xsd:element id="sitm_SignificantAccountingPoliciesTable" name="SignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="sitm_OperatingLeaseAssetsAndLiabilitiesTableTextBlock" name="OperatingLeaseAssetsAndLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="sitm_ScheduleOfProvisionForIncomeTaxesAndEffectiveTaxRatesTableTextBlock" name="ScheduleOfProvisionForIncomeTaxesAndEffectiveTaxRatesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="sitm_LeasesOfLessorAndLesseeDisclosureTextBlock" name="LeasesOfLessorAndLesseeDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="sitm_NonRecurringEngineeringServicesPolicyTextBlock" name="NonRecurringEngineeringServicesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
