This post explains for the semiconductor C3855.
The Part Number is 2SC3855.
The function of this semiconductor is NPN Transistor.
Preview images :
This is 140V, 10A, Silicon NPN Power Transistor (SavantIC Semiconductor).
1. With TO-3PN package
2. Complement to type 2SA1491
Audio and general purpose
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 200 V
2. Collector to Emitter Voltage: Vceo = 140 V
3. Emitter to Base Voltage: Vebo = 6 V
4. Collector Current: Ic = 10 A
5. Collector Dissipation : Pc = 100 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C