This part is a kind of semiconductor called BD538.

Function of this product has COMPLEMENTARY SILICON POWER TRANSISTORS.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

BD533/5/7 BD534/6/8 COMPLEMENTARY SILICON POWER TRANSISTORS s BD534, BD535, BD536, BD537 AND BD538 ARE SGS-THOMSON PREFERRED SALESTYPES DESCRIPTION The BD533, BD535, and BD537 are silicon epitaxial-base NPN power transistors in Jedec TO-220 plastic package, intented for use in medium power linear and switching applications. The complementary PNP types are BD534, BD536, and BD538 respectively. TO-220 1 2 3 INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter NPN PNP V CBO V CES V CEO V EBO I C, I E IB P t ot T stg Tj Collector-Base Voltage (IE = 0) Collector-Emitter Voltage (V BE = 0) Collector-Emitter Voltage (I B = 0) Emitter-Base Voltage (I C = 0) Collector and Emitter Current Base Current Total Dissipation at T c ≤ 25 C o Value BD533 BD534 45 45 45 BD535 BD536 [ ... ]

BD538 PDF Datasheet Download