This post explains for the semiconductor K2608.
The Part Number is K2608.
The function of this semiconductor is 2SK2608.
Manufacturers : Toshiba Semiconductor, Package : TO-220AB type
Preview images :
2SK2608 TOSHIBA Field Effect Transistor Silicon N Channel MOS Type (π−MOSIII)
Switching Regulator Applications
? Low drain−source ON resistance : RDS (ON) = 3.73 Ω (typ.)
? High forward transfer admittance : |Yfs|= 2.6 S (typ.)
? Low leakage current : IDSS = 100 μA (max) (VDS = 720 V)
? Enhancement mode : Vth = 2.0~4.0 V (VDS = 10 V, ID = 1 mA)