This part is a kind of semiconductor called K4107.

Function of this product has 2SK4107.

Manufacturers : Toshiba Semiconductor

Image and pinout :

Some of the text within the PDF file :

2SK4107 TOSHIBA Field Effect Transistor Silicon N-Channel MOS Type (π-MOS VI) 2SK4107 ○ Switching Regulator Applications • • • • Low drain−source ON resistance Low leakage current Enhancement mode : RDS (ON) = 0. 33 Ω (typ.) Unit: mm High forward transfer admittance : |Yfs| = 8.5 S (typ.) : IDSS = 100 μA (max) (VDS = 500 V) : Vth = 2.0~4.0 V (VDS = 10 V, ID = 1 mA) Absolute Maximum Ratings (Ta = 25°C) Characteristic Drain−source voltage Drain−gate voltage (RGS = 20 kΩ) Gate−source voltage Drain current DC (Note 1) Symbol VDSS VDGR VGSS ID IDP PD EAS IAR EAR Tch Tstg Rating 500 500 ±30 15 60 150 765 15 15 150 −55~150 Unit V V V A A W mJ A mJ °C °C 1. GATE 2. DRAIN (HEAT SINK) 3. SOURCE Pulse (Note 1) Drain power dissipation (Tc = 25°C) [ ... ]

K4107 PDF Datasheet Download