This post explains for the transistor.
The Part Number is C5129, 2SC5129.
The function of this semiconductor is 600V, 10A, NPN Transistor.
The package is TO-220 Type
Manufacturer: Toshiba
Images
Description:
A C5129 NPN transistor is a type of bipolar junction transistor (BJT) that consists of two n-type semiconductor materials separated by a single p-type material.
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 1500 V
2. Collector to Emitter Voltage: Vceo = 600 V
3. Emitter to Base Voltage: Vebo = 5 V
4. Collector Current: Ic = 10 A
5. Total Dissipation : Pc = 50 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C

Applications
1. Horizontal Deflection Output for High Resolution Display, Color TV
2. High Speed Switching
C5129 PDF Datasheet
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