This part is a kind of semiconductor called 2SK870.

Function of this product has N-Channel MOSFET Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc N-Channel MOSFET Transistor isc Product Specification 2SK870 DESCRIPTION ·Drain Current –ID=20A@ TC=25℃ ·Drain Source Voltage- : VDSS=500V(Min) ·Fast Switching Speed APPLICATIONS ·Designed for high voltage, high speed power switching applications such as switching regulators, converters, solenoid and relay drivers. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL ARAMETER VALUE UNIT VDSS VGS ID Ptot Tj Tstg Drain-Source Voltage (VGS=0) 500 V Gate-Source Voltage ±20 V Drain Current-continuous@ TC=25℃ 20 A Total Dissipation@TC=25℃ 130 W Max. Operating Junction Temperature 150 ℃ Storage Temperature Range -55~150 ℃ THERMAL CHARACTERISTICS SYMBOL PARAMETER MAX UNIT Rth j-c Rth j-a Thermal Resistance,Junction to Case 1.67 Thermal Res [ ... ]

2SK870 PDF Datasheet Download