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Q&A

Posts tagged Darlington

Synonyms: Darlington-pair Darlington-connection Darlington-configuration Darlington-transistor

Subtag of electronics-basic-building-block

Anything related to a Darlington-connected pair of BJTs (a.k.a. Darlington pair), both as a discrete pair or as a component (Darlington transistor).

The configuration is built with a pair of BJTs with the same polarity (both NPN or PNP) and is essentially equivalent to a single BJT having a current gain that is the product of the current gains of the single transistors.

Don't use this tag for the similar connection with transistors of different polarity, which is known as "complementary Darlington configuration" or "Sziklai pair", for which you should use the corresponding tag.
Tag Wiki

A Darlington pair is a connection between two BJTs of the same polarity (both NPN or PNP), which are often referred to as the input transistor and the output transistor.

The configuration is built by connecting both collectors together and feeding the emitter of the input transistor to the base of the output one. You end up with a compound device whose base terminal is the base of the input transistor, the emitter terminal is the emitter of the output transistor and the collector terminal is the junction point between the two collectors.

The pair is essentially equivalent to a single BJT having a current gain β that is the product of the current gains of the single transistors.

Darlington transistor on Wikipedia.

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Q&A Darlington or Sziklai configuration - why and when using complementary pairs?

Why does the Darlington or Sziklai configurations need complementary transistors? For these configurations, when should I use complementary pairs and when could I use not complementary pairs ?

1 answer  ·  posted 3y ago by coquelicot‭  ·  edited 8mo ago by Lorenzo Donati‭