This post explains for the transistor.
The Part Number is C4131, 2SC4131.
The function of this semiconductor is 50V, 15A, NPN Transistor.
The package is TO-3PF Type
Manufacturer: Sanken
Preview images :
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Description
The C4131 is 50V, 15A, Silicon NPN Epitaxial Planar Transistor.
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 100 V
2. Collector to Emitter Voltage: Vceo = 50 V
3. Emitter to Base Voltage: Vebo = 15 V
4. Collector Current: Ic = 15 A
5. Collector Dissipation : Pc = 60 W ( Tc=25°C )
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
Applications:
1. DC-DC Converter
2. Emergency Lighting Inverter
C4131 Transistor Datasheet
