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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.
The pin configuration of the TIP122 transistor is given below the diagram.
| 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 |
The Complement of the TIP122 transistor is TIP127.
BC547, BC548,BC549, BC636, BC639, 2N2369, 2N3055, 2N3904, 2N3906, 2SC5200
NPN Family transistors are TIP120, TIP121, TIP122, and PNP Family are TIP125, TIP126, TIP127 (PNP)
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.
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.
The datasheet of TIP122 is: