This part is a kind of semiconductor called BD242A.

Function of this product has COMPLEMENTARY SILICON POWER TRANSISTORS.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

BD241A/B/C BD242A/B/C COMPLEMENTARY SILICON POWER TRANSISTORS s s SGS-THOMSON PREFERRED SALESTYPES COMPLEMENTARY PNP - NPN DEVICES DESCRIPTION The BD241A, BD241B and BD241C are silicon epitaxial-base NPN transistors mounted in Jedec TO-220 plastic package. They are inteded for use in medium power linear and switching applications. The complementary PNP types are BD242A, BD242B and BD242C respectively. TO-220 3 1 2 INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter NPN PNP V CER V CEO V EBO IC I CM IB P tot P tot T stg Tj Collector-Base Voltage (R BE = 100 Ω ) Collector-Emitter Voltage (I B = 0) Emitter-Base Voltage (I C = 0) Collector Current Collector Peak Current Base Current Total Dissipation at T c ≤ 25 o C Total Dissipation at T amb ≤ 25 o C Storage Temper [ ... ]

BD242A PDF Datasheet Download