This post explains for the transistor.
The Part Number is C2553, 2SC2553. The package is TO-220AB Type.
The function of this semiconductor is 400V, 5A, Silicon NPN transistor.
Manufacturer: Toshiba
Images
Description:
The C2553 is 400V, 5A, Silicon NPN 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 = 7 V
4. Collector Current: Ic = 1 A
5. Total Dissipation : Pc = 1.5 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
Applications
1. Switching regulator and high voltage switching
2. High speed DC-DC converter

C2553 PDF Datasheet
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