This post explains for the transistor.
The Part Number is 2SD401A, D401A.
The package is TO-220 type.
The function of this semiconductor is 150V, 2A, NPN Transistor.
Manufacturer: Mospec Semiconductor
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Description
This is 150V, 2A, NPN Silicon Power Transistor.
It designed for use in general purpose power amplifier, vertical output apllication.
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 200 V
2. Collector to Emitter Voltage: Vceo = 150 V
3. Emitter to Base Voltage: Vebo = 5.0 V
4. Collector Current: Ic = 2.0 A
5. Total Dissipation: Pd = 25 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
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Features
1. Collector-Emitter Voltage: Vceo = 150V(Min)
2. DC Current Gain : hFE = 40 ~ 200 @Ic = 400mA
3. Complementary to PNP 2SB546A
D401A Datasheet PDF
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