This post explains for the NPN Transistor.
The Part Number is C4517A, 2SC4517A, 2SC4517.
The function of this semiconductor is 1000V, 3A, NPN Transistor.
The package is TO-220F Type
Preview images :
This is 1000V, 3A, Silicon NPN Power Transistor.
1. With TO-220F package
2. High voltage switching transistor
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 1000 V
2. Collector to Emitter Voltage: Vceo = 550 V
3. Emitter to Base Voltage: Vebo = 7 V
4. Collector Current: Ic = 3 A
5. Collector Dissipation : Pc = 30 W ( Tc=25°C )
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
1. For switching regulator and general purpose applications