![]() ![]() Can be used to switch high current (upto 5A) loads. ![]() 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. Although care has to be taken to check if the logic device can source upto 120mA. This transistor has a low Base-Emitter Voltage of only 5V hence can be easily controlled by a Logic device like microcontrollers. TIP120 transistor is known for its high current gain (hfe = 1000) and high collector current (IC =5A) hence it is normally used to control loads with high current or in applications where high amplification is required. This increases the current gain and current rating of this transistor. The Darlington pair inside this transistor is shown clearly as its internal circuit schematic belowĪs you can see, there are two transistors inside this TO-220 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. If you need more voltage then you can check other transistor in the same family lit the TIP122. It can also withstand about 60V across its collector- Emitter hence can be used to drive heavy loads. ![]() 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 1000. The TIP122 is a Darlington pair NPN transistor. Note: Complete Technical Details can be found at the TIP120 datasheet given at the end of this page.
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