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Two transistor symbols nested inside one outline.
Also known as: Darlington transistor, Darlington configuration, Two transistors in one outline, Super-beta pair
A Darlington pair is two transistors wired so the first drives the second, multiplying their current gains together — often reaching tens of thousands. The price is a doubled base-emitter voltage drop, around 1.4 volts, which surprises anyone who assumed 0.7.
Denotes a Darlington pair: two bipolar transistors connected so the emitter current of the first is the base current of the second.
Contexts: Electrical equipment
Multiplies the current gains of the two devices, typically giving a gain in the thousands from a single package.
Contexts: Electrical equipment
Has roughly double the base-emitter voltage drop of a single transistor, near 1.4 volts, and switches off more slowly.
Contexts: Electrical equipment
Two bipolar transistor symbols drawn one above the other with their leads joined, enclosed by a single circle or dashed outline.