This part is a kind of semiconductor called BD241.

Function of this product has NPN SILICON POWER TRANSISTORS.

Manufacturers : Power Innovations Limited

Image and pinout :

Some of the text within the PDF file :

BD241, BD241A, BD241B, BD241C NPN SILICON POWER TRANSISTORS Copyright © 1997, Power Innovations Limited, UK JUNE 1973 - REVISED MARCH 1997 q Designed for Complementary Use with the BD242 Series 40 W at 25°C Case Temperature 3 A Continuous Collector Current 5 A Peak Collector Current Customer-Specified Selections Available B C E q q q q TO-220 PACKAGE (TOP VIEW) 1 2 3 Pin 2 is in electrical contact with the mounting base. MDTRACA absolute maximum ratings at 25°C case temperature (unless otherwise noted) RATING BD241 Collector-emitter voltage (RBE = 100 Ω) BD241A BD241B BD241C BD241 Collector-emitter voltage (IC = 30 mA) BD241A BD241B BD241C Emitter-base voltage Continuous collector current Peak collector current (see Note 1) Continuous base current Continuous device dissipation [ ... ]

BD241 PDF Datasheet Download