This part is a kind of semiconductor called BD440.

Function of this product has Medium Power Linear and Switching Applications.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

BD440/442 BD440/442 Medium Power Linear and Switching Applications • Complement to BD439, BD441 respectively PNP Epitaxial Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol VCBO Parameter Collector-Base Voltage : BD440 : BD442 VCES Collector-Emitter Voltage : BD440 : BD442 Collector-Emitter Voltage : BD440 : BD442 Emitter-Base Voltage Collector Current (DC) *Collector Current (Pulse) Base Current Collector Dissipation (TC=25°C) Junction Temperature Storage Temperature 1 TO-126 2.Collector 3.Base 1. Emitter Value - 60 - 80 - 60 - 80 - 60 - 80 -5 -4 -7 -1 36 150 - 65 ~ 1 50 Units V V V V V V V A A A W °C °C VCEO VEBO IC ICP IB PC TJ TSTG Electrical Characteristics TC=25°C unless otherwise noted Symbol VCEO(sus) Parameter Collector-Emitter Sust [ ... ]

BD440 PDF Datasheet Download