D401A PDF Datasheet – 150V, 2A, NPN Transistor, 2SD401A

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


D401A datasheet


D401A is 150V, 2A, NPN Silicon Power Transistor. This Transistor is a type of bipolar junction transistor (BJT) made from silicon, a semiconductor material. This transistor is designed for amplifying or switching electronic signals in various electronic circuits.

NPN Configuration:

1. Emitter (N): The heavily doped N-type layer, which is the source of charge carriers (electrons) in the transistor.

2. Base (P): The thin P-type layer, which controls the flow of charge carriers between the emitter and collector.

3. Collector (N): The N-type layer, which collects the charge carriers that pass through the base-emitter junction.

It designed for use in general purpose power amplifier, vertical output apllication.


1 page
D401A transistor pinout


1. Collector-Emitter Voltage: Vceo = 150V(Min)

2. DC Current Gain : hFE = 40 ~ 200 @Ic = 400mA

3. Complementary to PNP 2SB546A


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

D401A PDF Datasheet


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