This post explains for the MOSFET.
The Part Number is 2SK4100LS, 2SK4100.
The function of this semiconductor is 650V, N-Channel Silicon MOSFET.
Manufacturer: Sanyo Semicon Device
Preview images :
This is 650V, 6A, N-Channel Silicon MOSFET.
• Low ON-resistance, low input capacitance, ultrahigh-speed switching.
• Adoption of high reliability HVP process.
• Attachment workability is good by Mica-less package.
• Avalanche resistance guarantee.
Absolute Maximum Ratings (Ta = 25°C)
1. Drain to source voltage: VDSS = 650 V
2. Gate to source voltage: VGSS = ± 30 V
3. Drain current: ID = 6 A
4. Allowable Power Dissipation: Pd = 2 W
5. Channel temperature: Tch = 150 °C
6. Storage temperature: Tstg = -55 to +150 °C
1. General-Purpose Switching Device