Exhibit 21.1

Subsidiaries of Semtech Corporation

• Semtech Corpus Christi Corporation (a Texas corporation)

• Semtech Corpus Christi, S.A. de C.V. (a Mexican corporation)

• Semtech New York Corporation (a Delaware corporation)

• Semtech San Diego Corporation (a California corporation)

• Sierra Monolithics, Inc. (a California corporation)

• Semtech (International) AG (a Swiss company limited by shares)

• Semtech France SARL

• Semtech Germany GmbH

• Semtech Switzerland GmbH

• Semtech Limited (a private limited company under the Companies Act 1948 to 1967 of the United Kingdom, registered in Scotland)

• Semtech Neuchâtel SARL (a Swiss limited liability company)

• Semtech Semiconductor (Shenzhen) Company Limited

• Semtech Semiconductor (Malaysia) Sdn Bhd

• Semtech Semiconductor Holdings Limited

• Semtech Semiconductor (Chengdu) Co. Ltd.

• Semtech Semiconductor (Shanghai) Co., Ltd.