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Darlington transistor

A Darlington transistor circuit is a compound transistor circuit which consists of two transistors in which the collectors are tied together and the emitter of the first or input transistor is directly coupled to the base of the second or output transistor. The emitter current of the input transistor equals the base current of the output transistor. A Darlington transistor pair includes two transistors coupled in a high-gain fashion. The first transistor receives an input signal, amplifies it, and drives the second transistor which amplifies it further. A Darlington transistor circuit, which is obtained by cascade-connecting a plurality of transistors, has a very high total current-amplification factor, because the total current-amplification factor is a product of current-amplification factors of respective transistors. The high-speed switching characteristic of the Darlington transistor circuit is an important factor for a switching device. High power Darlington transistors are typically used in inverter circuits for AC motor control, control circuits for DC motor control and emergency power supply, etc. In particular, they are being used as semiconductor devices for switching large currents in high power circuits.

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