This part is a kind of semiconductor called BDW47.

Function of this product has DARLINGTON COMPLEMENTARY SILICON POWER TRANSISTORS.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

BDW42 − NPN, BDW46, BDW47 − PNP BDW42 and BDW47 are Preferred Devices Darlington Complementary Silicon Power Transistors This series of plastic, medium−power silicon NPN and PNP Darlington transistors are designed for general purpose and low speed switching applications. Features http://onsemi.com • High DC Current Gain − hFE = 2500 (typ) @ IC = 5.0 Adc. • Collector Emitter Sustaining Voltage @ 30 mAdc: • • • • VCEO(sus) = 80 Vdc (min) − BDW46 100 Vdc (min) − BDW42/BDW47 Low Collector Emitter Saturation Voltage VCE(sat) = 2.0 Vdc (max) @ IC = 5.0 Adc 3.0 Vdc (max) @ IC = 10.0 Adc Monolithic Construction with Built−In Base Emitter Shunt resistors TO−220AB Compact Package Pb−Free Packages Are Available* 15 AMP DARLINGTON COMPLEMENTARY SIL [ ... ]

BDW47 PDF Datasheet Download