This part is a kind of semiconductor called 2SK1643.

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 2SK1643 DESCRIPTION ·Drain Current –ID=5A@ TC=25℃ ·Drain Source Voltage- : VDSS=900 (Min) ·Fast Switching Speed APPLICATIONS ·high speed high current switching applications ·DC-DC converter and motor driver applications ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL ARAMETER VDSS Drain-Source Voltage (VGS=0) VGS Gate-Source Voltage ID Drain Current-continuous@ TC=25℃ Ptot Total Dissipation@TC=25℃ Tj Max. Operating Junction Temperature Tstg Storage Temperature Range VALUE UNI T 900 V ±30 V 5A 125 W 150 ℃ -55~150 ℃ THERMAL CHARACTERISTICS SYMBOL PARAMETER MAX UNIT Rth j-c Rth j-a Thermal Resistance,Junction to Case 1.00 ℃/W Thermal Resistance,Junction to Ambient 83.3 ℃/ [ ... ]

2SK1643 PDF Datasheet Download