NJW0302G Transistor | Datasheet | Amplifier Circuit | Equivalent onsemi

NJW0302G amplifier circuit

NJW0302G an actual picture

The NJW0302G is a high performance PNP type bipolar power transistor with high reliability and very low distortion. It is mainly used as an amplifier and power switching device.

NJW0302G Circuit Diagram

I will use an audio amplification example to explain the working principle of the NJW0302G as follows.
1. The audio signal is output from the audio source device and enters the audio power amplifier to find the circuit where the NJW0302G is located.
2. Weak audio signals first by other small components of the circuit initial organization and amplification.
3. NJW0302G greatly changes the collector current according to the base signal change to amplify the audio signal.
4. Amplified signal from the collector output, into the next link.
5. The amplified signal drives the speaker cone to vibrate, converting the electrical signal into sound.

Class B amplifier Circuit

The NJW0302G is often used in conjunction with the NJW0281G to combine to form a Class B amplifier. When the input signal is positive, the NJW0302G begins to conduct and amplifies the positive half-cycle signal. When the input signal is negative, the NJW0281G starts to conduct and amplifies the negative half-cycle signal. The two transistors work alternately, each amplifying only one half-cycle.

NJW0302G Equivalent

The NJW0302G is a high-power transistor from onsemi, widely used in power amplifier and switching applications. This table compares the NJW0302G with several equivalent transistors from other manufacturers, including TIP142, BDX53C, 2N5551, MJE2955, and S8050. Key specifications like voltage rating, current rating, gain, and power dissipation are highlighted to help in selecting the best equivalent part for specific use cases.

Picture	Transistor	Manufacturer	Package Type	Voltage Rating	Current Rating	Gain (hFE)	Power Dissipation
	NJW0302G	onsemi	TO-220-2	60V	15A	20-60	80W
	TIP142	onsemi	TO-220-2	100V	12A	50-150	80W
	BDX53C	STMicroelectronics	TO-220-2	80V	15A	50-150	80W
	2N5551	onsemi	TO-220-2	60V	15A	20-120	80W
	MJE2955	ON Semiconductor	TO-220-2	60V	15A	40-120	80W
	S8050	Sanken Electric	TO-220-2	60V	10A	30-100	70W

The NJW0302G offers a balance of high current rating (15A) and moderate voltage rating (60V), with a power dissipation capacity of 80W. By comparing it with alternatives like the TIP142, BDX53C, and others, users can determine the most suitable replacement based on their application’s requirements, including voltage, current, and gain considerations. Always choose an equivalent that best matches the performance needs of your circuit design.