This part is a kind of semiconductor called TIP42.

Function of this product has PNP SILICON POWER TRANSISTORS.

Manufacturers : Power Innovations Limited

Image and pinout :

Some of the text within the PDF file :

TIP42, TIP42A, TIP42B, TIP42C PNP SILICON POWER TRANSISTORS Copyright © 1997, Power Innovations Limited, UK DECEMBER 1970 - REVISED MARCH 1997 q Designed for Complementary Use with the TIP41 Series 65 W at 25°C Case Temperature 6 A Continuous Collector Current 10 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 TIP42 Collector-base voltage (IE = 0) TIP42A TIP42B TIP42C TIP42 Collector-emitter voltage (IB = 0) TIP42A TIP42B TIP42C Emitter-base voltage Continuous collector current Peak collector current (see Note 1) Continuous base current Continuous device dissipation at (or be [ ... ]

TIP42 PDF Datasheet Download