This part is a kind of semiconductor called BD743.

Function of this product has NPN SILICON POWER TRANSISTORS.

Manufacturers : Power Innovations Limited

Image and pinout :

Some of the text within the PDF file :

BD743, BD743A, BD743B, BD743C NPN SILICON POWER TRANSISTORS Copyright © 1997, Power Innovations Limited, UK AUGUST 1978 - REVISED MARCH 1997 q Designed for Complementary Use with the BD744 Series 90 W at 25°C Case Temperature 15 A Continuous Collector Current 20 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 BD743 Collector-base voltage (IE = 0) BD743A BD743B BD743C BD743 Collector-emitter voltage (IB = 0) BD743A BD743B BD743C Emitter-base voltage Continuous collector current Peak collector current (see Note 1) Continuous base current Continuous device dissipation at (or bel [ ... ]

BD743 PDF Datasheet Download