This part is a kind of semiconductor called BD440.

Function of this product has COMPLEMENTARY SILICON POWER TRANSISTORS.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

BD439/BD440 BD441/BD442 COMPLEMENTARY SILICON POWER TRANSISTORS s s SGS-THOMSON PREFERRED SALESTYPES COMPLEMENTARY PNP - NPN DEVICES DESCRIPTION The BD439 and BD441 are silicon epitaxial-base NPN power transistors in Jedec SOT-32 plastic package, intented for use in power linear and switching applications. The complementary PNP types are BD440, and BD442 respectively. SOT-32 3 2 1 INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter NPN PNP V CBO V CES V CEO V EBO IC I CM IB P tot T stg Tj Collector-Base Voltage (I E = 0) Collector-Emitter Voltage (V BE = 0) Collector-Emitter Voltage (I B = 0) Emitter-Base Voltage (I C = 0) Collector Current Collector Peak Current (t ≤ 10 ms) Base Current Total Dissipation at T c ≤ 25 o C Storage Temperature Max. Operating Juncti [ ... ]

BD440 PDF Datasheet Download