TIP122 Transistor NPN Darlington

TIP122 Transistor pinout

The TIP122 transistor is a Darlington transistor often used to control high power switching and amplifications. It is a part of TIP series of NPN Darlington transistors. Transistor TIP122 consists of two NPN transistors connected in a Darlington configuration. This transistor can handle relatively high collector currents and moderate collector-emitter voltages (around 100 volts).

The TIP122 transistor is commonly available in a TO-220 package. It is normally mounted on a heat sink to manage heat dissipation. TIP122 primary applications include driving high-power loads like relays,  solenoids, and making it useful in various control and amplifier circuits.

TIP122 Transistor pinout

TIP122 pinout

The pin configurations of Transistor 122TIP are given in the above diagram and pin descriptions is given in the table given below.

TIP122 Transistor Pinout Configuration

Pin Number Pin Name Description
1 Base Base of all transistors is used to Controls the biasing of transistor
2 Collector Current flows in transistors through collector, normally connected to load
3 Emitter Emitter is used to Drains out current, normally connected to ground

Technical Features transistor tip122

  • Package Type  TO-220
  • Darlington Medium-power NPN Transistor
  • High DC Current Gain (hFE), typically 1000
  • Max Continuous Collector current (IC) is 5A
  • Max Collector-Emitter voltage (VCE) is 100 V
  • Max Collector-Base voltage (VCB) is 100V
  • Max Emitter Base Voltage (VBE) is 5V
  • Base Current(IB) is 120mA
  • Available in To-220 Package

Tip122 transistor equivalent

  • BD679: BD679 transistor is a suitable alternative with similar specifications.
  • TIP120: The TIP120 is same series as the TIP and has almost similar specifications.
  • 2N6284: 2N6284 is another NPN Darlington transistor with high current and voltage ratings.

Some other alternate of tip122 are 2N6045, 2N6532, 2SD1415, 2SD2495, BDT63, BDW2, KSB601, KSD560, MJF6388. These all transistors has high power but their pin configurations may differ from 122TIP. So, must check the pin out if you use any alternate transistor.

Same Family Transistors:

Transistor TIP120, TIP121, TIP122 (NPN); TIP125, TIP126, TIP127 (PNP) are same family  But may differ from the pin configurations of TIP122 Transistor.

Tip122 transistor uses

Tip122 transistor uses are given below in the list.

  • Relay Drivers
  • Motor Control
  • High-Current Switching
  • Audio Amplification
  • Voltage Regulation
  • Switch-Mode Power Supplies
  • Pulse and Signal Amplification
  • High-Power LED Drivers

TIP122 datasheet

Datasheet of transistor TIP122 is:

TIP122 circuit

In the given below circuit we have used this transistor as an circuit to control a motor.

tip122 circuit

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