Darlington transistor Guide, Meaning , Facts, Information and Description
In
electronics, the
Darlington transistor is a
semiconductor device which combines two
bipolar transistors in tandem (often called a "Darlington pair") in a single device. This gives it high current
gain (commonly written β), and takes up less space than using two discrete transistors in the same configuration. The total gain of the Darlington is the product of the gain of the individual transistors. A typical modern device has a current gain of 1000 or more. It has more phase shift at high frequencies than a single transistor, and hence can become unstable with negative
feedback much more easily. The base-emitter voltage is also higher; it is the sum of both base-emitter voltages and for silicon-transistor >1.2 V. This configuration (originally realized as two separate transistors) was invented by
Bell Laboratories engineer
Sidney Darlington. The idea of putting two or three transistors on a single chip was patented by him, but not the idea of putting an arbitrary number of transistors, which would cover all modern
ICs.
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