FET Field Effect Transistor Circuit Symbols

Circuit symbols for the variety of forms of field effect transistor, FET: n-channel, p-channel, enhancement, depletion, JFET, MOSFET, dual gate FET, . . .


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Field effect transistors, FETs come in a large variety of different types. Each type of FET has its own circuit symbol, so it helps to understand the different types of FET and their circuit symbols to enable the circuits to be read accurately.

Junction FETs or JFETs were the first type of FET and these have a distinctive symbol showing the diode junction. Insulated gate FETs, including MOSFETs have circuit symbols that indicate the insulation on the gate.

Obviously dual gate FETs have two gates and both need to be incorporated into the circuit symbol.


FET Circuit Symbols
 
FET Type Circuit Symbol
J-FET N channel N Channel  junction FET, JFET circuit symbol
J-FET P channel P Channel  junction FET, JFET circuit symbol
Basic enhancemment insulated gate FET
(MOSFET) N channel
N channel MOSFET / IGFET circuit symbol
Basic enhancemment insulated gate FET
(MOSFET) P channel
P channel MOSFET / IGFET circuit symbol
Basic enhancemment insulated gate FET
(MOSFET) N channel no bulk semiconductor
N channel MOSFET / IGFET circuit symbol no bulk semiconductor
Basic enhancemment insulated gate FET
(MOSFET) P channel no bulk semiconductor
P channel MOSFET / IGFET circuit symbol no bulk semiconductor
Basic depletion insulated gate FET
N channel
N channel depletion FET, circuit symbol
Basic depletion insulated gate FET
P channel
P channel depletion FET, circuit symbol


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