This post explains for the transistor.
The Part Number is A1020, 2SA1020.
The function of this semiconductor is -50V, -2A, PNP Transistor.
The package is TO-92MOD Type
Manufacturer: Toshiba Semiconductor
Preview images :
Description
A1020 is -50V, -2A, Silicon PNP Epitaxial Transistor. (PCT Process)
Characteristics of PNP transistors:
Features
1. Low Collector saturation voltage: VCE (sat) = -0.5 V (max) (IC = -1 A)
2. High-speed switching: tstg = 1.0 µs (typ.)
3. Complementary to 2SC2655
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = – 50 V
2. Collector to Emitter Voltage: Vceo = – 50 V
3. Emitter to Base Voltage: Vebo = – 5 V
4. Collector Current: Ic = – 2 A
5. Collector Dissipation : Pc = 900 mW
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
Applications:
1. Power Amplifier
2. Power Switching