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    <link:label id="lab_us-gaap_IncomeStatementLocationAxis_29703C77B6918E658C1688C5A8AB40EA_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_29703C77B6918E658C1688C5A8AB40EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Axis]</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementLocationDomain_868CAC59231EBFA5BDDE88C5A8ABF664_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_868CAC59231EBFA5BDDE88C5A8ABF664" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementLocationDomain_868CAC59231EBFA5BDDE88C5A8ABF664_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_868CAC59231EBFA5BDDE88C5A8ABF664" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
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    <link:label id="lab_us-gaap_SalesRevenueNetMember_7FE90EEAAD80B9A28EC388C5A8ABBEE1_verboseLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueNetMember_7FE90EEAAD80B9A28EC388C5A8ABBEE1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Revenue Offset [Member]</link:label>
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    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_1C4424FC16A2C18B1A3588C5A8ACF4C8_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_1C4424FC16A2C18B1A3588C5A8ACF4C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Selling, General and Administrative Expenses [Member]</link:label>
    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_1C4424FC16A2C18B1A3588C5A8ACF4C8_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_1C4424FC16A2C18B1A3588C5A8ACF4C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, General and Administrative Expenses [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_1C4424FC16A2C18B1A3588C5A8ACF4C8" xlink:type="locator" />
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    <link:label id="lab_smtc_ProductDevelopmentAndEngineeringMember_3441276A77E98E4228FE88C5A8AC2962_terseLabel_en-US" xlink:label="lab_smtc_ProductDevelopmentAndEngineeringMember_3441276A77E98E4228FE88C5A8AC2962" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product Development And Engineering [Member]</link:label>
    <link:label id="lab_smtc_ProductDevelopmentAndEngineeringMember_3441276A77E98E4228FE88C5A8AC2962_label_en-US" xlink:label="lab_smtc_ProductDevelopmentAndEngineeringMember_3441276A77E98E4228FE88C5A8AC2962" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product Development And Engineering [Member]</link:label>
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    <link:label id="lab_smtc_PercentageofEquityInterestinDirectandIndirectNonU.S.SubsidiariesThatAreIncludedAsPledgedAssets_F00AAC6A3BA341BEC28197E41F2D4486_terseLabel_en-US" xlink:label="lab_smtc_PercentageofEquityInterestinDirectandIndirectNonU.S.SubsidiariesThatAreIncludedAsPledgedAssets_F00AAC6A3BA341BEC28197E41F2D4486" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of equity interest in direct non-U.S. subsidiaries that are included as pledged assets</link:label>
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    <link:label id="lab_smtc_InterestCoverageRatio_B64D25BD65BE0503741E97E41F2D96B3_terseLabel_en-US" xlink:label="lab_smtc_InterestCoverageRatio_B64D25BD65BE0503741E97E41F2D96B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest coverage ratio</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_4BF47CE11A25A43F6B91B1DE0373BAD3_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_4BF47CE11A25A43F6B91B1DE0373BAD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_E529FD796FA13892E559B1DE037331D9_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_E529FD796FA13892E559B1DE037331D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sales of property, plant and equipment</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_8CB6DA819CC34E0FE7B2B1DE03731D50" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_30C567A9B3F19ECE3FF4B1DE0373CDC1_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_30C567A9B3F19ECE3FF4B1DE0373CDC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of investments</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_95EE61170B3D581896F6B1DE0373C544_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_95EE61170B3D581896F6B1DE0373C544" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_35204DD834638DB8FE01B1DE03733A20_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_35204DD834638DB8FE01B1DE03733A20" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_35204DD834638DB8FE01B1DE03733A20_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_35204DD834638DB8FE01B1DE03733A20" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities [Abstract]</link:label>
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    <link:label id="lab_us-gaap_RepaymentsOfSecuredDebt_BC12309B506EF7BAAA17B1DE03747651_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfSecuredDebt_BC12309B506EF7BAAA17B1DE03747651" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Payments of term loans</link:label>
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    <link:label id="lab_us-gaap_AssetsAbstract_48BD8E15EC1B76311E7AAEA168C5D0A9_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_48BD8E15EC1B76311E7AAEA168C5D0A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AssetsNoncurrentAbstract_9735260558E5D68ACDA6AEA168C525DA_label_en-US" xlink:label="lab_us-gaap_AssetsNoncurrentAbstract_9735260558E5D68ACDA6AEA168C525DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Noncurrent [Abstract]</link:label>
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