This part is a kind of semiconductor called K2182.
Function of this product has 2SK2182.
Manufacturers : Shindengen Electric
Image and pinout :

Some of the text within the PDF file :
SHINDENGEN VX-2 Series Power MOSFET N-Channel Enhancement type 2SK2182 (F3F50VX2) 500V 3A OUTLINE DIMENSIONS Case : E-pack Case : FTO-220 (Unit : mm) FEATURES •œ Input capacitance (Ciss) is small. Especially, input capacitance at 0 biass is small. •œ The static Rds(on) is small. •œ The switching time is fast. APPLICATION •œ Switching power supply of AC 100V input •œ High voltage power supply •œ Inverter RATINGS •œAbsolute Maximum Ratings • Tc i = 25•Ž•j Item Symbol Conditions Storage Temperature Tstg Channel Temperature Tch Drain-Source Voltage VDSS Gate-Source Voltage VGSS Continuous Drain Current• DC•j i ID Continuous Drain Current• Peak) i IDP Continuous Source Current• DC•j i IS PT Total Power Dissipation Single Pulse Av [ ... ]
K2182 PDF Datasheet Download
