This post explains for the Transistor.

The Part Number is 2SC5478.

The function of this semiconductor is 900V, 50mA, NPN Transistor.

The package is TO-220AB type

Manufacturer: Sanyo Semicon Device

Preview images:

Description

This is 900V, 50mA, NPN Triple Diffused Planar Silicon Transistor.

C5478 Transistor is a type of bipolar junction transistor (BJT) made from silicon, a semiconductor material. This transistor is designed for amplifying or switching electronic signals in various electronic circuits.

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Features:

1. High breakdown voltage

2. Small Cob

3. Wide ASO

4. High reliability ( Adoption of HVP process )

 

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 1700 V

2. Collector to Emitter Voltage: Vceo = 900 V

3. Emitter to Base Voltage: Vebo = 5 V

4. Collector Current: Ic = 50 mA

5. Collector Dissipation : Pc = 1.75 W

6. Junction Temperature: Tj = 150°C

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

C5478 PDF Datasheet