This part is a kind of semiconductor called 2SK3538.

Function of this product has Switching Regulator / DC-DC Converter Applications.

Manufacturers : Toshiba Semiconductor

Image and pinout :

Some of the text within the PDF file :

2SK3538 TOSHIBA Field Effect Transistor Silicon N Channel MOS Type (π-MOSV) 2SK3538 Switching Regulator, DC-DC Converter Applications · · · · Low drain-source ON resistance: RDS (ON) = 75 mΩ (typ.) High forward transfer admittance: |Yfs| = 7.0 S (typ.) Low leakage current: IDSS = 100 µA (VDS = 500 V) Enhancement-mode: Vth = 2.0 to 4.0 V (VDS = 10 V, ID = 1 mA) Unit: mm Maximum Ratings (Ta = 25°C) Characteristics Drain-source voltage Drain-gate voltage (RGS = 20 kW) Gate-source voltage Drain current DC (Note 1) Symbol VDSS VDGR VGSS ID IDP PD EAS IAR (Note 3) Channel temperature Storage temperature range EAR Tch Tstg Rating 500 500 ±30 8 32 65 312 8 6.5 150 -55 to 150 Unit V V V A W mJ A mJ °C °C Pulse (Note 1) Drain power dissipation (Tc = 25°C) Single pulse avalanche energ [ ... ]

2SK3538 PDF Datasheet Download