TIP121 PDF

It functions like a normal NPN transistor, but since it has a Darlington pair inside it has a good collector current rating of about 5A and a gain of about It can also withstand about V across its collector- Emitter hence can be used to drive heavy loads. The Darlington pair inside this transistor is shown clearly as its internal circuit schematic below As you can see, there are two transistors inside this TO package in which the emitter of the first transistor is connected with the base of the second transistor and the collector of both transistors are connected together to form a Darlington pair. This increases the current gain and current rating of this transistor. This transistor has a low Base-Emitter Voltage of the only 5V hence can be easily controlled by a Logic device like microcontrollers. Although care has to be taken to check if the logic device can source up to mA.

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It functions like a normal NPN transistor, but since it has a Darlington pair inside it has good collector current rating of about 5A and a gain of about It can also withstand about 60V across its collector- Emitter hence can be used to drive heavy loads. If you need more voltage then you can check other transistor in the same family lit the TIP The Darlington pair inside this transistor is shown clearly as its internal circuit schematic below As you can see, there are two transistors inside this TO package in which the emitter of first transistor is connected with the base of second transistor and the collector of both transistors are connected together to form a Darlington pair.

This increases the current gain and current rating of this transistor. This transistor has a low Base-Emitter Voltage of only 5V hence can be easily controlled by a Logic device like microcontrollers.

Although care has to be taken to check if the logic device can source upto mA. So, if you looking for a transistor that could be easily controlled by a Logic device to switch high power loads or to amplify high current then this Transistor might be an ideal choice for your application. Can be used to switch high current upto 5A loads Can be used as medium Power switches Used where high amplification is needed Speed control of Motors Inverter and other rectifier circuits 2D-Model 2D dimensions will help you in placing this component at the time of making circuit on perf board or a PCB.

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