Exhibit 21.1

MICROCHIP TECHNOLOGY INCORPORATED

LIST OF SIGNIFICANT SUBSIDIARIES

Microchip Technology (Thailand) Co., Ltd.

14 Moo 1, T. Wangtakien

A. Muang Chacherngsao

Chacherngsao 24000

Thailand

Microchip Technology (Barbados) II Incorporated

Hastings Business Services Limited

Hastings, Christ Church

Barbados

Microchip Technology Ireland Limited

Block 3.1

Woodford Business Park

Northern Cross

Santry

Dublin 9 Ireland