This post explains for the MOSFET.
The Part Number is K2842, 2SK2842.
The function of this semiconductor is 500V, 12A, N-Channel MOSFET.
The package is TO-220 Type
Preview images :
This is Silicon N Channel MOS Type Field Effect Transistor.
1. Low drain−source ON resistance : RDS (ON) = 0.4 Ω (typ.)
2. High forward transfer admittance : |Yfs| = 9.0 S (typ.)
3. Low leakage current : IDSS = 100 μA (max) (VDS = 500 V)
4. Enhancement mode : Vth = 2.0 to 4.0 V (VDS = 10 V, ID = 1 mA)
Absolute Maximum Ratings (Ta = 25°C)
1. Drain to source voltage: VDSS = 500 V
2. Gate to source voltage: VGSS = ± 30 V
3. Drain current: ID = 12 A
4. Drain Power Dissipation: Pd = 40 W
5. Channel temperature: Tch = 150 °C
6. Storage temperature: Tstg = -55 to +150 °C
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