This post explains for the transistor.
The Part Number is B1587, 2SB1587.
The function of this semiconductor is -150V, -8A, PNP transistor.
The package is TO3PF Type
Manufacturer: Sanken
Preview images :
Description
B1587 is -150V, -8A, Silicon PNP Epitaxial Planar Transistor. ( Complement to type 2SD2438 )
Characteristics:
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = – 160 V
2. Collector to Emitter Voltage: Vceo = – 150 V
3. Emitter to Base Voltage: Vebo = – 5 V
4. Collector Current: Ic = – 8 A
5. Collector Dissipation : Pc = 75 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
Application :
1. Audio, Series Regulator and General Purpose