Transistor Circuit Symbols

Views: 22     Author: Site Editor     Publish Time: 2020-07-05      Origin: Site

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.

Table: Transistor Circuit Symbols




NPN transistor

NPN Bipolar Transistor

Allows current flow when high potential at base

NPN transistor

PNP Bipolar Transistor

Allows current flow when low potential at base

Darlington transistor

Darlington Transistor

Made from 2 bipolar transistors

JFET-N transistor

JFET-N Transistor

N-channel field effect transistor

JFET-P transistor

JFET-P Transistor

P-channel field effect transistor

NMOS transistor

NMOS Transistor

N-channel MOSFET transistor

PMOS transistor

PMOS Transistor

P-channel MOSFET transistor

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