Bipolar Transistor Circuit Symbols

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There are not too many circuit symbols for bipolar transistors. There are of course different circuit symbols to indicate NPN and PNP transistors.

In addition to this, some transistor circuit symbols have the circle around them and others not. Those without are widely used in the circuits detailing the internal circuitry of ICs as it is easier to incorporate the multiple emitters and other variations of the basic transistor if the circle is not included.

Other bipolar transistor circuit symbols include those for phototransistors and Darlington transistors, etc.

Bipolar Transistor Circuit Symbols
Transistor Description	Circuit Symbol
NPN bipolar transistor
PNP bipolar transistor
NPN bipolar transistor with electrodes marked.
NPN bipolar transistor with no outer circle
NPN bipolar phototransistor
NPN bipolar phototransistor with no base connection
NPN bipolar phototransistor
NPN photodarlington
Transistor optocoupler circuit symbol

  Written by Ian Poole .
  Experienced electronics engineer and author.

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