This part is a kind of semiconductor called 2SK2564.
Function of this product has VX-2 Series Power MOSFET(600V 8A).
Manufacturers : Shindengen Electric Mfg.Co.Ltd
Image and pinout :

Some of the text within the PDF file :
SHINDENGEN VX-2 Series Power MOSFET N-Channel Enhancement type 2SK2564 (F8F60VX2) 600V 8A FEATURES Input capacitance (Ciss) is small. Especially, input capacitance at 0 biass is small. The static Rds(on) is small. The switching time is fast. Avalanche resistance guaranteed. APPLICATION Switching power supply of AC 100-200V input Inverter Power Factor Control Circuit OUTLINE DIMENSIONS Case : FTO-220 (Unit : mm) DataShee RATINGS Absolute Maximum Ratings iTc = 25j Item Symbol Conditions Storage Temperature T stg T ch Channel Temperature VDSS Drain-Source Voltage VGSS Gate-Source Voltage ID Continuous Drain CurrentiDC j I DP Continuous Drain CurrentiPeak) Continuous Source CurrentiDC j IS Total Power Dissipation PT I AS Single Pulse Avalanche Curr [ ... ]
2SK2564 PDF Datasheet Download
