<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:32a528f2-73e2-4e51-a5af-74e5b68cd7ac,g:10003bf7-9b81-4d82-9b21-77d3ed51354a-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:sitm="http://www.sitime.com/20240930" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.sitime.com/20240930">
  <xs:import namespace="http://fasb.org/srt/2024" schemaLocation="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2024" schemaLocation="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2024" schemaLocation="https://xbrl.sec.gov/country/2024/country-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2024" schemaLocation="https://xbrl.sec.gov/dei/2024/dei-2024.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2024" schemaLocation="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="sitm-20240930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="sitm-20240930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="sitm-20240930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="sitm-20240930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.sitime.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheets" roleURI="http://www.sitime.com/role/CondensedConsolidatedBalanceSheets">
        <link:definition>9952151 - Statement - Condensed Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedBalanceSheetsParenthetical" roleURI="http://www.sitime.com/role/CondensedConsolidatedBalanceSheetsParenthetical">
        <link:definition>9952152 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" roleURI="http://www.sitime.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss">
        <link:definition>9952153 - Statement - Condensed Consolidated Statements Of Operations And Comprehensive Loss</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfStockholdersEquity" roleURI="http://www.sitime.com/role/CondensedConsolidatedStatementsOfStockholdersEquity">
        <link:definition>9952154 - Statement - Condensed Consolidated Statements Of Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CondensedConsolidatedStatementsOfCashFlows" roleURI="http://www.sitime.com/role/CondensedConsolidatedStatementsOfCashFlows">
        <link:definition>9952155 - Statement - Condensed Consolidated Statements Of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TheCompanyandBasisofPresentation" roleURI="http://www.sitime.com/role/TheCompanyandBasisofPresentation">
        <link:definition>9952156 - Disclosure - The Company and Basis of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Acquisitions" roleURI="http://www.sitime.com/role/Acquisitions">
        <link:definition>9952157 - Disclosure - Acquisitions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.sitime.com/role/FairValueMeasurements">
        <link:definition>9952158 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponents" roleURI="http://www.sitime.com/role/BalanceSheetsComponents">
        <link:definition>9952159 - Disclosure - Balance Sheets Components</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.sitime.com/role/Leases">
        <link:definition>9952160 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquity" roleURI="http://www.sitime.com/role/StockholdersEquity">
        <link:definition>9952161 - Disclosure - Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.sitime.com/role/IncomeTaxes">
        <link:definition>9952162 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentGeographicandCustomerInformation" roleURI="http://www.sitime.com/role/SegmentGeographicandCustomerInformation">
        <link:definition>9952163 - Disclosure - Segment, Geographic and Customer Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.sitime.com/role/CommitmentsandContingencies">
        <link:definition>9952164 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetLossPerShare" roleURI="http://www.sitime.com/role/NetLossPerShare">
        <link:definition>9952165 - Disclosure - Net Loss Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="TheCompanyandBasisofPresentationPolicies" roleURI="http://www.sitime.com/role/TheCompanyandBasisofPresentationPolicies">
        <link:definition>9954471 - Disclosure - The Company and Basis of Presentation (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsTables" roleURI="http://www.sitime.com/role/AcquisitionsTables">
        <link:definition>9954472 - Disclosure - Acquisitions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.sitime.com/role/FairValueMeasurementsTables">
        <link:definition>9954473 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsTables" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsTables">
        <link:definition>9954474 - Disclosure - Balance Sheets Components (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.sitime.com/role/LeasesTables">
        <link:definition>9954475 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityTables" roleURI="http://www.sitime.com/role/StockholdersEquityTables">
        <link:definition>9954476 - Disclosure - Stockholders' Equity (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesTables" roleURI="http://www.sitime.com/role/IncomeTaxesTables">
        <link:definition>9954477 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentGeographicandCustomerInformationTables" roleURI="http://www.sitime.com/role/SegmentGeographicandCustomerInformationTables">
        <link:definition>9954478 - Disclosure - Segment, Geographic and Customer Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesTables" roleURI="http://www.sitime.com/role/CommitmentsandContingenciesTables">
        <link:definition>9954479 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetLossPerShareTables" roleURI="http://www.sitime.com/role/NetLossPerShareTables">
        <link:definition>9954480 - Disclosure - Net Loss Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsAdditionalInformationDetails" roleURI="http://www.sitime.com/role/AcquisitionsAdditionalInformationDetails">
        <link:definition>9954481 - Disclosure - Acquisitions - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsScheduleofAcquisitionDateFairValueofthePurchaseConsiderationDetails" roleURI="http://www.sitime.com/role/AcquisitionsScheduleofAcquisitionDateFairValueofthePurchaseConsiderationDetails">
        <link:definition>9954482 - Disclosure - Acquisitions - Schedule of Acquisition Date Fair Value of the Purchase Consideration (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsScheduleofAssetsAcquiredDetails" roleURI="http://www.sitime.com/role/AcquisitionsScheduleofAssetsAcquiredDetails">
        <link:definition>9954483 - Disclosure - Acquisitions - Schedule of Assets Acquired (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AcquisitionsScheduleofProFormaInformationDetails" roleURI="http://www.sitime.com/role/AcquisitionsScheduleofProFormaInformationDetails">
        <link:definition>9954484 - Disclosure - Acquisitions - Schedule of Pro Forma Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsAdditionalInformationDetails" roleURI="http://www.sitime.com/role/FairValueMeasurementsAdditionalInformationDetails">
        <link:definition>9954485 - Disclosure - Fair Value Measurements - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsFairValueLiabilitiesMeasuredonRecurringBasisDetails" roleURI="http://www.sitime.com/role/FairValueMeasurementsFairValueLiabilitiesMeasuredonRecurringBasisDetails">
        <link:definition>9954486 - Disclosure - Fair Value Measurements - Fair Value, Liabilities Measured on Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsScheduleofAccountsReceivableNetDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsScheduleofAccountsReceivableNetDetails">
        <link:definition>9954487 - Disclosure - Balance Sheets Components - Schedule of Accounts Receivable, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsScheduleofInventoryDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsScheduleofInventoryDetails">
        <link:definition>9954488 - Disclosure - Balance Sheets Components - Schedule of Inventory (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsScheduleofPrepaidExpensesandOtherCurrentAssetsDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsScheduleofPrepaidExpensesandOtherCurrentAssetsDetails">
        <link:definition>9954489 - Disclosure - Balance Sheets Components - Schedule of Prepaid Expenses and Other Current Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsScheduleofPropertyandEquipmentNetDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsScheduleofPropertyandEquipmentNetDetails">
        <link:definition>9954490 - Disclosure - Balance Sheets Components - Schedule of Property and Equipment Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsAdditionalInformationDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsAdditionalInformationDetails">
        <link:definition>9954491 - Disclosure - Balance Sheets Components - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsScheduleofIntangibleAssetsNetDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsScheduleofIntangibleAssetsNetDetails">
        <link:definition>9954492 - Disclosure - Balance Sheets Components - Schedule of Intangible Assets Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsScheduleofFutureAmortizationExpenseforIntangibleAssetsDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsScheduleofFutureAmortizationExpenseforIntangibleAssetsDetails">
        <link:definition>9954493 - Disclosure - Balance Sheets Components - Schedule of Future Amortization Expense for Intangible Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsScheduleofAccruedExpensesandOtherCurrentLiabilitiesDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsScheduleofAccruedExpensesandOtherCurrentLiabilitiesDetails">
        <link:definition>9954494 - Disclosure - Balance Sheets Components - Schedule of Accrued Expenses and Other Current Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BalanceSheetsComponentsOtherNoncurrentLiabilitiesDetails" roleURI="http://www.sitime.com/role/BalanceSheetsComponentsOtherNoncurrentLiabilitiesDetails">
        <link:definition>9954495 - Disclosure - Balance Sheets Components - Other Noncurrent Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesAdditionalInformationDetails" roleURI="http://www.sitime.com/role/LeasesAdditionalInformationDetails">
        <link:definition>9954496 - Disclosure - Leases - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofLeaseRelatedAssetsandLiabilitiesDetails" roleURI="http://www.sitime.com/role/LeasesScheduleofLeaseRelatedAssetsandLiabilitiesDetails">
        <link:definition>9954497 - Disclosure - Leases - Schedule of Lease Related Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofLeaseCostsDetails" roleURI="http://www.sitime.com/role/LeasesScheduleofLeaseCostsDetails">
        <link:definition>9954498 - Disclosure - Leases - Schedule of Lease Costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofUndiscountedCashFlowsDetails" roleURI="http://www.sitime.com/role/LeasesScheduleofUndiscountedCashFlowsDetails">
        <link:definition>9954499 - Disclosure - Leases - Schedule of Undiscounted Cash Flows (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofUndiscountedCashFlowsDetails_1" roleURI="http://www.sitime.com/role/LeasesScheduleofUndiscountedCashFlowsDetails_1">
        <link:definition>9954499 - Disclosure - Leases - Schedule of Undiscounted Cash Flows (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityAdditionalInformationDetails" roleURI="http://www.sitime.com/role/StockholdersEquityAdditionalInformationDetails">
        <link:definition>9954500 - Disclosure - Stockholders' Equity - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityScheduleofRestrictedStockUnitAwardRSUandPerformanceBasedRestrictedStockUnitAwardsPRSUandMultiyearPerformanceRestrictedStockUnitsMYPSUActivityDetails" roleURI="http://www.sitime.com/role/StockholdersEquityScheduleofRestrictedStockUnitAwardRSUandPerformanceBasedRestrictedStockUnitAwardsPRSUandMultiyearPerformanceRestrictedStockUnitsMYPSUActivityDetails">
        <link:definition>9954501 - Disclosure - Stockholders' Equity - Schedule of Restricted Stock Unit Award ("RSU") and Performance Based Restricted Stock Unit Awards ("PRSU") and Multi-year Performance Restricted Stock Units ("MYPSU") Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityScheduleOfShareBasedPaymentArrangementSharesWithheldForTaxWithholdingObligationDetails" roleURI="http://www.sitime.com/role/StockholdersEquityScheduleOfShareBasedPaymentArrangementSharesWithheldForTaxWithholdingObligationDetails">
        <link:definition>9954502 - Disclosure - Stockholders' Equity - Schedule Of Share-Based Payment Arrangement, Shares Withheld For Tax Withholding Obligation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityScheduleofStockbasedCompensationExpenseAmountsIncludedinCondensedConsolidatedStatementofOperationsDetails" roleURI="http://www.sitime.com/role/StockholdersEquityScheduleofStockbasedCompensationExpenseAmountsIncludedinCondensedConsolidatedStatementofOperationsDetails">
        <link:definition>9954503 - Disclosure - Stockholders' Equity - Schedule of Stock-based Compensation Expense Amounts Included in Condensed Consolidated Statement of Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityScheduleofUnrecognizedCompensationCostsandRelatedWeightedAveragePeriodofRecognitionDetails" roleURI="http://www.sitime.com/role/StockholdersEquityScheduleofUnrecognizedCompensationCostsandRelatedWeightedAveragePeriodofRecognitionDetails">
        <link:definition>9954504 - Disclosure - Stockholders' Equity - Schedule of Unrecognized Compensation Costs and Related Weighted Average Period of Recognition (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesScheduleofProvisionforIncomeTaxesandEffectiveTaxRatesDetails" roleURI="http://www.sitime.com/role/IncomeTaxesScheduleofProvisionforIncomeTaxesandEffectiveTaxRatesDetails">
        <link:definition>9954505 - Disclosure - Income Taxes - Schedule of Provision for Income Taxes and Effective Tax Rates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesAdditionalInformationDetails" roleURI="http://www.sitime.com/role/IncomeTaxesAdditionalInformationDetails">
        <link:definition>9954506 - Disclosure - Income Taxes - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentGeographicandCustomerInformationAdditionalInformationDetails" roleURI="http://www.sitime.com/role/SegmentGeographicandCustomerInformationAdditionalInformationDetails">
        <link:definition>9954507 - Disclosure - Segment, Geographic and Customer Information - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentGeographicandCustomerInformationScheduleofRevenuebyCountryDetails" roleURI="http://www.sitime.com/role/SegmentGeographicandCustomerInformationScheduleofRevenuebyCountryDetails">
        <link:definition>9954508 - Disclosure - Segment, Geographic and Customer Information - Schedule of Revenue by Country (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentGeographicandCustomerInformationScheduleofPropertyandEquipmentAttributabletoOperationsDetails" roleURI="http://www.sitime.com/role/SegmentGeographicandCustomerInformationScheduleofPropertyandEquipmentAttributabletoOperationsDetails">
        <link:definition>9954509 - Disclosure - Segment, Geographic and Customer Information - Schedule of Property and Equipment Attributable to Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesDetails" roleURI="http://www.sitime.com/role/CommitmentsandContingenciesDetails">
        <link:definition>9954510 - Disclosure - Commitments and Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetLossPerShareScheduleofComputationofBasicandDilutedNetIncomeLossperShareDetails" roleURI="http://www.sitime.com/role/NetLossPerShareScheduleofComputationofBasicandDilutedNetIncomeLossperShareDetails">
        <link:definition>9954511 - Disclosure - Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Income (Loss) per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetLossPerShareAdditionalInformationDetails" roleURI="http://www.sitime.com/role/NetLossPerShareAdditionalInformationDetails">
        <link:definition>9954512 - Disclosure - Net Loss Per Share - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="sitm_AccruedExpensesAndOtherCurrentLiabilities" abstract="false" name="AccruedExpensesAndOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_NetIncomeLossAttributableToCommonStockholderAndComprehensiveIncomeLoss" abstract="false" name="NetIncomeLossAttributableToCommonStockholderAndComprehensiveIncomeLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_UnrealizedInterestOnHeldToMaturitySecurities" abstract="false" name="UnrealizedInterestOnHeldToMaturitySecurities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfSalesBasedEarnoutRelatedToContingentConsiderationLiability" abstract="false" name="BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfSalesBasedEarnoutRelatedToContingentConsiderationLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_BusinessCombinationDeferredConsiderationArrangementsChangeInAmountOfDeferredConsiderationLiability" abstract="false" name="BusinessCombinationDeferredConsiderationArrangementsChangeInAmountOfDeferredConsiderationLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_PaymentForAcquisitionConsiderationPayable" abstract="false" name="PaymentForAcquisitionConsiderationPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_OperatingLeaseAssetsAndLiabilitiesTableTextBlock" abstract="false" name="OperatingLeaseAssetsAndLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sitm_ScheduleOfShareBasedPaymentArrangementSharesWithheldForTaxWithholdingObligationTableTextBlock" abstract="false" name="ScheduleOfShareBasedPaymentArrangementSharesWithheldForTaxWithholdingObligationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sitm_SummaryOfUnrecognizedCompensationCostsAndRelatedWeightedAveragePeriodOfRecognitionTableTextBlock" abstract="false" name="SummaryOfUnrecognizedCompensationCostsAndRelatedWeightedAveragePeriodOfRecognitionTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sitm_ScheduleOfProvisionForIncomeTaxesAndEffectiveTaxRatesTableTextBlock" abstract="false" name="ScheduleOfProvisionForIncomeTaxesAndEffectiveTaxRatesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sitm_ScheduleOfPropertyAndEquipmentAttributableToOperationsTableTextBlock" abstract="false" name="ScheduleOfPropertyAndEquipmentAttributableToOperationsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="sitm_AuraMember" abstract="true" name="AuraMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_BusinessCombinationConsiderationTransferredSupplyAgreementSettlement" abstract="false" name="BusinessCombinationConsiderationTransferredSupplyAgreementSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_TreasuryBillsMaturityDate" abstract="false" name="TreasuryBillsMaturityDate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sitm_LabAndManufacturingEquipmentMember" abstract="true" name="LabAndManufacturingEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_InternalUseSoftwareMember" abstract="true" name="InternalUseSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_PurchasedSoftwareMember" abstract="true" name="PurchasedSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_FiniteLivedIntangibleAssetsAmortizationExpenseYearFiveAndAfterYearFive" abstract="false" name="FiniteLivedIntangibleAssetsAmortizationExpenseYearFiveAndAfterYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_RevenueReserves" abstract="false" name="RevenueReserves" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_BusinessCombinationDeferredConsiderationLiabilityCurrent" abstract="false" name="BusinessCombinationDeferredConsiderationLiabilityCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_BusinessCombinationDeferredConsiderationLiabilityNoncurrent" abstract="false" name="BusinessCombinationDeferredConsiderationLiabilityNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_LesseeOperatingLeaseLiabilityPaymentsDueYearFiveAndThereafter" abstract="false" name="LesseeOperatingLeaseLiabilityPaymentsDueYearFiveAndThereafter" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_AtTheMarketIssuanceSalesAgreementMember" abstract="true" name="AtTheMarketIssuanceSalesAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_TwentyTwentyFourGoalsMember" abstract="true" name="TwentyTwentyFourGoalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_TotalStockholderPerformanceRestrictedStockUnitAwardMember" abstract="true" name="TotalStockholderPerformanceRestrictedStockUnitAwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_LiabilityBasedAwardMember" abstract="true" name="LiabilityBasedAwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_PercentageOfSalesCommissionFromCommonStockSold" abstract="false" name="PercentageOfSalesCommissionFromCommonStockSold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sitm_SaleOfCommonStockPricePerShare" abstract="false" name="SaleOfCommonStockPricePerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="sitm_ProceedsFromIssuanceOfCommonStockNetOfUnderwritingDiscountsAndCommissions" abstract="false" name="ProceedsFromIssuanceOfCommonStockNetOfUnderwritingDiscountsAndCommissions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_PaymentsForUnderwritingDiscountsAndCommissions" abstract="false" name="PaymentsForUnderwritingDiscountsAndCommissions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sitm_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sitm_PerformanceRestrictedStockUnitAwardMember" abstract="true" name="PerformanceRestrictedStockUnitAwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_MultiYearPerformanceRestrictedStockUnitAwardMember" abstract="true" name="MultiYearPerformanceRestrictedStockUnitAwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRFRollForward" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRFRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sitm_EquityAwardMember" abstract="true" name="EquityAwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_LiabilityBasedAwardsToBeSettledInEquityMember" abstract="true" name="LiabilityBasedAwardsToBeSettledInEquityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_EquityAndLiabilityBasedAwardsMember" abstract="true" name="EquityAndLiabilityBasedAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_OtherCountriesMember" abstract="true" name="OtherCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_RajeshVashistMember" abstract="true" name="RajeshVashistMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_KatherineSchuelkeMember" abstract="true" name="KatherineSchuelkeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_LionelBonnotMember" abstract="true" name="LionelBonnotMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_PiyushSevaliaMember" abstract="true" name="PiyushSevaliaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sitm_VincentPangrazioMember" abstract="true" name="VincentPangrazioMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
