What is C4977? – 400 V, 7A, NPN Power Transistor

What is C4977?

This is a type of transistor that is commonly used in electronic circuits for amplification and switching applications. It is a bipolar junction transistor (BJT) that has a maximum collector current of 7A and a maximum collector-base voltage of 400V.

Part Number: C4977, 2SC4977

Function:  400 V, 7A, NPN Power Transistor

Package: TO-220F Type

Manufacturer: INCHANGE Semiconductor

Image and Pinouts:
C4977 datasheet


This is 400V, 7A, NPN Transistor. It is a versatile transistor that can be used in a wide range of electronic circuits for amplification and switching purposes.


1. High current gain: High current gain, which makes it suitable for use in low-power amplifier circuits.

2. High cutoff frequency: The transistor has a high cutoff frequency, which allows it to be used in high-frequency applications such as RF circuits and oscillators.

3. Low noise: It has low noise characteristics, making it ideal for use in audio amplifier circuits.


Designed for use in high-voltage, high-speed, power switching in inductive circuit , they are particularly suited for 115 and 220V switchmode applications such as switching regulator

’s, inverters, DC-DC converter.

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 450 V

2. Collector to Emitter Voltage: Vceo = 400 V

3. Emitter to Base Voltage: Vebo = 8 V

4. Collector Current: Ic = 7 A

5. Collector Dissipation : Pc = 40 W

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -55 ~ +150°C

C4977 Datasheet PDF Download

C4977 pdf

Other data sheets are available within the file: 2SC4977

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