This part is a kind of semiconductor called 2N3773.
Function of this product has NPN Power Transistors.
Manufacturers : ON Semiconductor
Image and pinout :

Some of the text within the PDF file :
2N3773 NPN Power Transistors The 2N3773 is a PowerBaset power transistor designed for high power audio, disk head positioners and other linear applications. This device can also be used in power switching circuits such as relay or solenoid drivers, DC−DC converters or inverters. Features • High Safe Operating Area (100% Tested) 150 W @ 100 V • Completely Characterized for Linear Operation • High DC Current Gain and Low Saturation Voltage hFE = 15 (Min) @ 8.0 A, 4.0 V VCE(sat) = 1.4 V (Max) @ IC = 8.0 A, IB = 0.8 A • For Low Distortion Complementary Designs • This is a Pb−Free Device MAXIMUM RATINGS (Note 1) Rating Symbol Value Unit Collector − Emitter Voltage Collector − Emitter Voltage Collector − Base Voltage Emitter − Base Voltage Collector Current − Conti [ ... ]
2N3773 PDF Datasheet Download
