Exhibit 21.1 SUBSIDIARIES Littelfuse, S.A. de C.V. Littelfuse do Brasil Ltda. Littelfuse da Amazonia, Ltda. SurgX Corporation Teccor Electronics, Inc. Teccor Delaware, Inc. Littelfuse GP, Inc. Littelfuse I L.P. Teccor Electronics Mexico Holdings LLC Teccor de Mexico S.A. de. R.L. de C.V. Zie San Investment, Inc. Littelfuse Ireland Holding Ltd. Littelfuse Ireland Limited Littelfuse Ireland Development Co., Ltd. Littelfuse U.K. Ltd. Littelfuse, B.V. Littelfuse Europe Holding, B.V. Rempat Holding B.V. Rempat Financial B.V. Littelfuse Holding GmbH Littelfuse GmbH Heinrich Industrie GmbH H.I. Verwaltungs GmbH Wickmann Group, GmbH H.I. Immobilien Management GmbH Wickmann-Werke GmbH Wilhelm PUDENZ GmbH Littelfuse Far East Pte Ltd. Littelfuse HK Limited Suzhou Littelfuse OVS Ltd. Littelfuse KK Littelfuse Triad, Inc. Littelfuse Phils, Inc. Littelfuse S&L, Inc. Dongguan Wickmann Electrical Products Co. Wickmann Asia Ltd. Littelfuse Concord Semiconductor, Inc. Cameo Device Corporation Concord Holding (BVI) Co., Ltd. Concord Semiconductor (Wuxi) Company