This part is a kind of semiconductor called 20N50.

Function of this product has N-Channel Power MOSFET.

Manufacturers : nELL

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR 20N50 Series RRooHHSS Nell High Power Products N-Channel Power MOSFET (20A, 500Volts) DESCRIPTION The Nell 20N50 is a three-terminal silicon device with current conduction capability of 20A, fast switching speed, low on-state resistance, breakdown voltage rating of 500V, and max. threshold voltage of 5 volts. They are designed for use in applications such as switched mode power supplies, DC to DC converters, motor control circuits, UPS and general purpose switching applications. D G D S TO-3PB (20N50B) D (Drain) FEATURES RDS(ON) = 0.23Ω@VGS = 10V Ultra low gate charge(60nC max.) Low reverse transfer capacitance (CRSS = 27pF typical) Fast switching capability 100% avalanche energy specified Improved dv/dt capability 150°C operation temperature G (Gate) S (Source) P [ ... ]

20N50 PDF Datasheet Download