This post explains for the NPN transistor.
The Part Number is C4138, C4138.
The function of this semiconductor is 400V, 10A, NPN Transistor.
The package is TO-3P Type
Manufacturer: Sanken electric
Preview images :
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Description
The C4138 is 400V, 10A, Silicon NPN Triple Diffused Planar Transistor. This is High Voltage and High Speed Switchihg Transistor.
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 500 V
2. Collector to Emitter Voltage: Vceo = 400 V
3. Emitter to Base Voltage: Vebo = 10 V
4. Collector Current: Ic = 10 A
5. Collector Dissipation : Pc = 80 W ( Tc=25°C )
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
Application:
1. Switching Regulator and General Purpose