Darlington Transistor
The Darlington Transistor configuration of two bipolar
transistors offer increased current switching for a given base current.
The Darlington Transistor named
after its inventor, Sidney Darlington is a special arrangement of two standard
NPN or PNP bipolar junction transistors (BJT) connected together. The Emitter
of one transistor is connected to the base of the other to produce a more sensitive transistor with a much larger current gain being useful in
applications where current amplification or switching is required.
Darlington Transistor pairs
can be made from two individually connected bipolar transistors or one single
device commercially made in a single package with the standard: Base, Emitter
and Collector connecting leads and are available in a wide variety of case
styles and voltage (and current) ratings in both NPN and PNP versions.
As we
saw in our Transistor
as a Switch tutorial, as well as being used as an amplifier,
the bipolar junction transistor, (BJT) can be made to operate as an ON-OFF
switch as shown.
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