This part is a kind of semiconductor called BD440.

Function of this product has POWER TRANSISTORS PNP SILICON.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

BD436, BD438, BD440, BD442 Plastic Medium Power Silicon PNP Transistor This series of plastic, medium−power silicon PNP transistors can be used for for amplifier and switching applications. Complementary types are BD437 and BD441. Features • Pb−Free Packages are Available* http://onsemi.com 4.0 AMP POWER TRANSISTORS PNP SILICON ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎMAXIMUM RATINGS ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎRating Symbol Value Unit Collector−Emitter Voltage BD436 BD438 BD440 BD442 VCEO 32 45 60 80 Vdc Collector−Base Voltage BD436 BD438 BD440 BD442 VCBO 32 45 60 80 Vdc Emitter−Base Voltage VEBO 5.0 Vdc Collector Current IC 4.0 Adc Base Current IB 1.0 Adc Total Device Dissipation @ TC = 25°C Derate above 25°C PD 36 W 288 W/°C Operating and [ ... ]

BD440 PDF Datasheet Download