Exhibit 21.1

Subsidiaries of Semtech Corporation

• Semtech Corpus Christi Corporation (a Texas corporation)

• Semtech Corpus Christi, S.A. de C.V. (una Sociedad Mercantil de Nacionalidad Mexicana)

• Semtech New York Corporation (a Delaware corporation), doing business as Semtech, Semtech HID, Semtech HID and System Management, Semtech Human Input Device and System Management, USAR Systems, USAR

• Semtech San Diego Corporation (a California corporation), doing business as Edge Semiconductor Corporation, Edge Semiconductor, Semtech High Performance Products, Semtech ATE Division, Semtech San Diego, Semtech

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

• Semtech France SARL

• Semtech Germany GmbH

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

• Semtech Switzerland GmbH (a Swiss limited liability company)

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