This part is a kind of semiconductor called 2SK1018.

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 DESCRIPTION ·Drain Current –ID=18A@ TC=25℃ ·Drain Source Voltage- : VDSS=500V(Min) APPLICATIONS ·high voltage, high speed power switching isc Product Specification 2SK1018 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 ±30 V Drain Current-continuous@ TC=25℃ 18 A Total Dissipation@TC=25℃ 125 W Max. Operating Junction Temperature 150 ℃ Storage Temperature Range -55~150 ℃ THERMAL CHARACTERISTICS SYMBOL PARAMETER MAX UNIT Rth j-c Thermal Resistance,Junction to Case 1.0 ℃/W Rth j-a Thermal Resistance,Junction to Ambient 35 ℃/W isc website：www.iscsemi.cn 1 isc & iscsemi is registered trademark PDF pd [ ... ]

2SK1018 PDF Datasheet Download