This post explains for the MOSFET.
The Part Number is FB31N20D, IRFB31N20D.
The function of this semiconductor is SMPS MOSFET.
The package is TO-220AB, D2Pak, TO-262 Type
Manufacturer: International Rectifier
Preview images :
This is 200V, 31A, SMPS MOSFET.
1. Low Gate-to-Drain Charge to Reduce Switching Losses
2. Fully Characterized Capacitance Including Effective COSS to Simplify Design
3. Fully Characterized Avalanche Voltage and Current
Absolute Maximum Ratings (Ta = 25°C)
1. Gate to source voltage: VGSS = ± 30 V
2. Drain current: ID = 31 A
3. Power Dissipation: Pd = 3.1 W
4. Channel temperature: Tch = 175 °C
5. Storage temperature: Tstg = -55 to +175 °C
1. High frequency DC-DC converters