This part is a kind of semiconductor called 2SJ170.

Function of this product has P-Channel MOSFET Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc P-Channel MOSFET Transistor isc Product Specification 2SJ170 DESCRIPTION ·Low Drain-Source ON Resistance ·High Forward Transfer Admittance ·Low Leakage Current ·Enhancement-Mode APPLICATIONS ·High speed switching application ·Switching regulator ,DC-DC converter and Motor drive application ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL ARAMETER VALUE UNIT VDSS VGS ID Ptot Tj Tstg Drain-Source Voltage (VGS=0) -80 V Gate-Source Voltage ±20 V Drain Current-continuous@ TC=37℃ -12 A Total Dissipation@TC=25℃ 50 W Max. Operating Junction Temperature -55~150 ℃ Storage Temperature Range -55~150 ℃ THERMAL CHARACTERISTICS SYMBOL PARAMETER MAX UNIT Rth j-c Thermal Resistance,Junction to Case Rth j-a Thermal Resistance,Junction to Ambient 3.1 [ ... ]

2SJ170 PDF Datasheet Download