This part is a kind of semiconductor called 4N80.

Function of this product has N-Channel Power MOSFET.

Manufacturers : nELL

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR 4N80 Series RRooHHSS Nell High Power Products N-Channel Power MOSFET DESCRIPTION (4A, 800Volts) The Nell 4N80 is a three-terminal silicon device with current conduction capability of 4A, fast switching speed, low on-state resistance, breakdown voltage rating of 800V ,and max. threshold voltage of 5 volts. They are designed for use in applications. such as switched mode power supplies, DC to DC converters, PWM motor controls, bridge circuits, and general purpose switching applications . FEATURES RDS(ON) = 3.6Ω @ VGS = 10V Ultra low gate charge(25nC max.) Low reverse transfer capacitance (CRSS = 9pF typical) Fast switching capability 100% avalanche energy specified Improved dv/dt capability 150°C operation temperature D GDS TO-220AB (4N80A) GDS TO-220F (4N80AF) D ( [ ... ]

4N80 PDF Datasheet Download