This part is a kind of semiconductor called 2SK1377.

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 2SK1377 DESCRIPTION ·Drain Current –ID=5.5A@ TC=25℃ ·Drain Source Voltage- : VDSS=400V(Min) ·Fast Switching Speed APPLICATIONS ·Designed for high voltage, high speed power switching ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL ARAMETER VALUE UNIT VDSS VGS ID Ptot Tj Tstg Drain-Source Voltage (VGS=0) Gate-Source Voltage 400 ±30 Drain Current-continuous@ TC=25℃ 5.5 Total Dissipation@TC=25℃ 40 Max. Operating Junction Temperature 150 Storage Temperature Range -55~150 V V A W ℃ ℃ THERMAL CHARACTERISTICS SYMBOL PARAMETER MAX UNIT Rth j-c Rth j-a Thermal Resistance,Junction to Case 2.77 ℃/W Thermal Resistance,Junction to Ambient 62.5 ℃/W isc website：www.iscsemi.cn 1 isc [ ... ]

2SK1377 PDF Datasheet Download