This post explains for the transistor.
See the preview image and the PDF file for more information.
Part Number: C3306, 2SC3306
Function : Vcbo = 500V, Vceo = 400V, Pc = 100W, Ic = 10A, NPN Transistor
Package: TO-3P Type
Manufacturer: Toshiba
Image
Description
This is 400V, 10A, Silicon NPN Transistor.
1. Excellent Switching Times : tr = 1.0 us ( Max. ), tf = 1.0 us ( Max. ) ( Ic = 5A )
2. High Collector Breakdown Voltage: Vceo = 400V
Features
1. High Breakdown Voltage
2. Fast Switching Speed
3. Wide ASO
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 600 V
2. Collector to Emitter Voltage: Vceo = 400 V
3. Emitter to Base Voltage: Vebo = 7 V
4. Collector Current: Ic = 10 A
5. Total Dissipation : Pc = 100 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 Applications.
C3306 Datasheet
NTE Equivalent NTE2308