TIP142 transistors datasheet

TIP142 transistor
TIP142 transistor

The TIP142 is an NPN transistor developed by planner technologies TIP142 is a monolithic Darlington configuration transistor.

The TIP142 and TIP147 are the most common push-pull configuration transistors used at push-pull amplifier output stages that drive most sound systems.

TIP142 PINOUT and package brief explanation 

  1. Pin01 – BASE
  2. Pin02 – COLLECTOR
  3. Pin03 – EMITTER  
TIP142 transistor PINOUT
TIP142 transistor PINOUT

The PINOUT configuration used at the TIP142 transistor is ‘BCE’, this is very PIN configuration used at ‘TIP’ series transistors.

And the transistor package used at TIP142 is TO-247, it is the most package used at the higher power handling electronic component, they had a hole to attach the heat sink with it.

Internal block description of the TIP142 power transistor

Internal block description of the TIP142 transistor
Internal block description of the TIP142 transistor

The figure shows the internal structure of the TIP142 transistor, we can see two transistors are connected back to back, this is the reason why TIP142 is called the Darlington transistor.

The first internal transistor emitter is connected to the base of the second transistor, so the current amplified by the first transistor is also amplified by the second transistor.

The collector of both internal transistors is connected, this is why the TIP142 transistor had a higher gain value of 500 to 1000hFE and collector current value of 10A and at the pulsed condition, and it will be furthermore higher up to 20A.

The TIP147 complimentary pair transistor for TIP142 also had almost similar internal structure and characteristics.

datasheet of TIP142 transistor

TIP142 transistor datasheet
TIP142 transistor datasheet

If you need the datasheet in pdf please click this link

the complementary transistor of tip42

TIP142 transistor had equivalents such as 2SD1197, 2SD2390, BDV65B, and BDV67D, each one of the transistors in this list is NPN Darlington transistor type.

Most of the transistors in this list had almost the same electrical characteristics, so we can easily replace the TIP142 with these transistors at some circuit, but before the replacement process, we need to double-check the specific electrical specifications and PINOUT configuration.

TIP142 vs TIP122

Characteristics   TIP142   TIP122
Collector to base voltage (VCB) 100V 100V
Collector to emitter voltage (VCE) 100V 100V
Emitter to base voltage (VEB) 5V 5V
Collector current (IC) 10A 8A
Power dissipation 125W 65W
Junction temperature (TJ) -65 to +150°C -65 to 150°C
Transition frequency (FT)
     Noise (N)
   Gain (hFE) 500 to 1000hFE 1000hFE
    Package TO-247 TO-220


The TIP122 is also an NPN Darlington type transistor, which had almost the same electrical characteristics as TIP142, but TIP122 shows some variations at a collector current of 8A, dissipation capacity of 65W, and the package of TO-220.

Specifications and features of the TIP142 NPN BJT transistor  

  • TIP142 is an NPN BJT power Darlington transistor
  • Collector to base voltage (VCB) is 100V
  • Collector to emitter voltage (VCE) is 100V
  • Emitter to base voltage (VEB) is 5V
  • Collector current (IC) is 10A
  • Pulsed collector current (ICM) is 20A
  • Base current (IB) is 0.5A
  • Power dissipation (PD) is 125W
  • Current gain is 500 to 1000hFE
  • Junction temperature (TJ) is -65 to 150°C

TIP142 NPN transistor characteristics and application description

The TIP142 is called the NPN power Darlington transistor type, due to the connection of both internal transistors collector to collector, the TIP142 had a higher DC gain value almost double 500 to 1000hFE, and this is why the TIP142 transistor have applications at the amplifier and linear circuits.

The voltage value of collector to the base is 100V, collector to emitter is 100V, and emitter to base is 5V, tip142 transistor voltage value support at high voltage general purpose and industrial applications.

The TIP142 transistor is a higher load carrying transistor that mostly had industrial applications, the collector current value of 10A and on pulsed, it had 20A of collector current.

The power dissipation capacity of TIP142 is rather higher than any transistor type, it had a power dissipation value of 125W.

TIP142 NPN transistor application brief description

 TIP142 transistor had most applications at linear applications, which produce constant voltage and current values.

  • Audio amplifier-based applications are the most important example of linear circuits.
Audio amplifier
Audio amplifier

The figure shows the amplifier circuit using TIP142 and TIP147 complementary pair as the main push-pull component.

At this amplifier circuit, we can see two stages of TIP142 and TIP147 are used as the push-pull output stage that drives the most sound system.

After the preamplifier stages, the audio signal reaches the TIP push-pull section for output stage amplification.

We know TIP142 and TIP147 are called the Darlington pair transistor, so both of them had higher DC current gain, this circuit produces high watt audio power output.

  • Then TIP142 is very much suitable for industrial switching applications, turn-off and turn-on time of these transistors is lesser.
TIP142 transistor H-bridge network.
TIP142 transistor H-bridge network.

The figure shows the heavy load switching circuit using the TIP142 transistor H-bridge network.

The TIP142 transistor had a collector current load of 10A and pulsed collector current of 20A, the industrial motor speed controlling circuit is built with this transistor.

The switching operation of the TIP142 transistor-based h-bridge will control the speed of the heavy motor.

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