TIP142 | transistor equivalent | amplifier circuit | power supply onsemi

TIP142 Transistor Equivalent

The TIP142 is a widely used NPN Darlington transistor, primarily manufactured by onsemi. It is known for its high voltage (100V) and current (12A) ratings, making it suitable for power amplification in various electronic circuits. The following table lists equivalent transistors that can be used as TIP142 replacements with similar or higher performance.

Picture	Part Number	Manufacturer	Type	Package Type	Voltage (V)	Current (A)	Power Dissipation (W)	Gain (hFE)
	TIP142	onsemi	NPN	TO-247-3	100	12	80	50-1000
	TIP147	onsemi	NPN	TO-247-3	100	12	80	50-1000
	2N5401	onsemi	NPN	TO-220-2	100	15	80	40-800
	MJE3055	ON Semiconductor	NPN	TO-220-2	60	15	115	20-300
	2N2955	onsemi	NPN	TO-3	60	15	115	20-300
	BD139	STMicroelectronics	NPN	TO-220-2	80	8	40	40-320

These alternatives provide designers with flexibility when selecting a replacement transistor, ensuring optimal performance in power amplification applications.

TIP142 Amplifier Circuit

The TIP142 is an NPN-type Darlington power transistor, mostly used in conjunction with the TIP147. It is mostly used in high power applications such as audio amplifiers, switching power supplies, etc.

Tip142 physical picture

Tip142 interior pictures

B (base): controls the direction of current flow.
C (collector): receives the current flowing.
E (emitter): emits current.

Realization diagram of the Darlington structure

Complementary design connectivity of tip142 and tip147

The heart of the Darlington tube lies in the high current increase achieved by cascade amplification.
TIP142 (NPN type) is often used in conjunction with TIP147 (PNP type) for the following reasons:
1. Better control of high current.
2. When working together, amplify the current to both positive and negative directions to enhance the output power.
3. Cooperate with each other to help share the current and heat, prolonging the service life.