Exhibit 21.1

Subsidiaries of Semtech Corporation

• Semtech Corpus Christi Corporation (Texas)

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

• Semtech New York Corporation (Delaware)

• Semtech San Diego Corporation (California)

• Sierra Monolithics, Inc. (California)

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

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

• Semtech Semiconductor (Shenzhen) Company Limited (China)

• Semtech France SARL (France)

• Semtech Germany GmbH (Germany)

• Semtech Semiconductor Holdings Limited (Hong Kong)

• Semtech Semiconductor (Malaysia) Sdn Bhd

• Semtech (International) AG (Switzerland)

• Semtech Neuchatel SARL (Switzerland)

• Semtech Switzerland GmbH (Switzerland)

• Semtech EMEA Ltd (United Kingdom)

• Semtech Limited (United Kingdom)

• Semtech Canada Inc. (Ontario, Canada)