This post explains for the transistor.

The Part Number is 2SC3855, C3855.

The function of this semiconductor is 140V, NPN Transistor.

The package is TO-3PN Type

Manufacturer: SavantIC

Preview images :

Description

C3855 is 140V, 10A, Silicon NPN Power Transistor (SavantIC Semiconductor).

Featues :

1. With TO-3PN package

2. Complement to type 2SA1491

 

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

Applications:

1. Audio and general purpose

C3855 PDF Datasheet

This post explains for the transistor.

The Part Number is C3679, 2SC3679.

The function of this semiconductor is 800V, 5A, NPN Transistor.

The package is TO-3P Type.

Manufacturer: Sanken electric

Image:

Description

C3679 is 800V, 5A, Silicon NPN Triple Diffused Planar Transistor. High Voltage Switching Transistor.

Preview images :

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 900 V

2. Collector to Emitter Voltage: Vceo = 800 V

3. Emitter to Base Voltage: Vebo = 7 V

4. Collector Current: Ic = 5 A

5. Collector Dissipation : Pc = 100 W ( Tc=25°C )

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -55 ~ +150°C

Application:

1. Switching Regulator and General Purpose

 

C3679 PDF Datasheet