TIP122 Transistor is an NPN Darlington transistor. The Darlington transistor means there are two transistors in one pack joined to increase gain at the output. TIP122 Darlington transistor has a lot of good features, like 5A collector current, maximum emitter-base voltage is 5V, maximum collector dissipation is 65 watts, and so on. This transistor is manufactured to use as a switch and for amplification purposes. TIP122 Transistor Pinout configuration is given below.

TIP122 Transistor Pinout

The pin configuration of the TIP122 transistor is given below the diagram.


TIP122 Transistor Pinout, Equivalent, Uses, Features

TIP122 Pin Chart

Pin Number Pin Name Description
1 Base Controls the biasing of the transistor
2 Collector Current flows  through the collector
3 Emitter Current Drains out through the emitter

Features of TIP122 Transistor:

  • Type of Package: TO-220
  • Type of Transistor: NPN
  • Maximum Collector Current(IC): 5A
  • Max Collector & Emitter Voltage : 100V
  • Maximum Collector-Base Voltage: 100Vi
  • Emitter-Base Voltage Maximum is: 5V
  • Maximum Collector Dissipation: 65 Watt
  • Minimum and Maximum DC Current Gain: 1000
  • Maximum Storage and Operating temperature: -65 to +150 Centigrade

 The complement of the TIP122 Transistor:

The Complement of the TIP122 transistor is TIP127.

Alternative NPN Transistors:

BC547BC548,BC549, BC636, BC639, 2N2369, 2N3055, 2N3904, 2N3906, 2SC5200

Same Family Transistors:

NPN Family transistors are TIP120, TIP121, TIP122, and PNP Family are TIP125, TIP126, TIP127 (PNP)

How We Can Use it & How to Use:

This transistor can use as a switch in electronic circuits to drive any load under 5A according to its features. This transistor can be used in many applications for power supply circuits, battery charger circuits, driving motors, etc. It will also perform well as an amplifier and can be used as a different amplifier or in audio amplification steps. Furthermore, this transistor can also be used as an audio preamplifier and The emitter-base voltage of this transistor is 5V DC.  So this transistor can also be used at the output of a microcontroller and logic devices to control loads below 5A.

 Applications of TIP122 transistor:

  • Switching Loads Under 5A
  • Also used in Audio Amplifier Stages
  • Preamplifiers
  • Audio Amplifier circuits

Safe Long Run in a Circuit:

To get a very good performance with this Darlington transistor we suggest always stopping below its max ratings. It can not work in circuits using more than 100V. Do not put load over and always use a suitable base resistor to supply the required current on its base. Use a suitable heatsink to save it from overheating and to store its temperature below -65 centigrade and more than +150 centigrade.

tip122 transistor datasheet

The datasheet of TIP122 is: