The current gain of the Darlington pair hFE = hFE1 × hFE2 The current gain is equal to the gain of Each of them multiplied together: It causes the current amplified with the first to be amplified with the second transistor. Each circuit may or may not contain more than two transistors. Most of the time, we prefer to use it in normal transistor circuit form than IC. It also can be integrated inside an IC such as ULN2003 With this configuration, we are able to achieve a higher gain than a normal transistor. Why did it call Darlington transistor? – Because this configuration was invented by Sidney Darlington at Bell Labs in 1953. The Darlington transistor or Darlington pair is two bipolar transistors connected together as shown in the picture below. Learn more about transistor circuits HERE Darlington Transistor pair
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