Exhibit 21.1

Subsidiaries of Semtech Corporation

• Semtech EV, Inc. (California)

• Semtech San Diego Corporation (California)

• Sierra Monolithics, Inc. (California)

• Semtech Colorado, Inc. (Delaware)

• Semtech New York Corporation (Delaware)

• Semtech Corpus Christi Corporation (Texas)

• Triune IP, LLC (Texas)

• Triune Systems, L.L.C. (Texas)

• Semtech Canada Corporation (Nova Scotia, Canada)

• Semtech Quebec Inc. (Quebec, Canada)

• Semtech Semiconductor (Chengdu) Co. Ltd. (China)

• Semtech Semiconductor (Shanghai) Co. Ltd. (China)

• Semtech Semiconductor (Shenzhen) Company Limited (China)

• Semtech France SAS (France)

• Semtech Germany GmbH (Germany)

• Semtech Semiconductor Holdings Limited (Hong Kong)

• Semtech Advanced Systems India Private Limited (India)

• Semtech Japan GK (Japan)

• Semtech Semiconductor (Malaysia) Sdn Bhd (Malaysia)

• Semtech Corpus Christi S.A. de CV (Mexico)

• Snowbush Mexico S.A.P.I. de C.V. – 99.9% (Mexico)

• Semtech Netherlands BV (Netherlands)

• Semtech (International) AG (Switzerland)

• Semtech Neuchatel SARL (Switzerland)

• Gennum UK Limited (United Kingdom)

• Semtech EMEA Limited (United Kingdom)

• Semtech Limited (United Kingdom)