This part is a kind of semiconductor called 2SK1358.

Function of this product has FET/ Silicon N Channel MOS Type(for High Speed/ High Current DC-DC Converter/ Relay Drive and Motor Diver).

Manufacturers : Toshiba Semiconductor

Image and pinout :

Some of the text within the PDF file :

TOSHIBA Discrete Semiconductors 2SK1358 Field Effect Transistor Silicon N Channel MOS Type (π-MOS II.5) High Speed, High Current DC-DC Converter, Relay Drive and Motor Drive Applications Features • Low Drain-Source ON Resistance - RDS(ON) = 1.1Ω (Typ.) • High Forward Transfer Admittance - Yfs = 4.0S (Typ.) • Low Leakage Current - IDSS = 300µA (Max.) @ VDS = 720V • Enhancement-Mode - Vth = 1.5 ~ 3.5V @ VDS = 10V, ID = 1mA Absolute Maximum Ratings (Ta = 25°C) CHARACTERISTIC Drain-Source Voltage Drain-Gate Voltage (RGS = 20kΩ) Gate-Source Voltage Drain Current DC Pulse Drain Power Dissipation (Tc = 25°C) Channel Temperature Storage Temperature Range Industrial Applications Unit in mm SYMBOL VDSS VDGR VGSS ID IDP PD Tch Tstg RATING 900 900 ±30 9 27 150 150 -55 ~ 150 [ ... ]

2SK1358 PDF Datasheet Download