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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Circuit symbols overview Resistors Capacitors Inductors, coils, chokes & transformers Diodes Bipolar transistors Field effect transistors Wires, switches & connectors Analogue & functional circuit blocks Logic

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
J-FET P channel
Basic enhancemment insulated gate FET (MOSFET) N channel
Basic enhancemment insulated gate FET (MOSFET) P channel
Basic enhancemment insulated gate FET (MOSFET) N channel no bulk semiconductor
Basic enhancemment insulated gate FET (MOSFET) P channel no bulk semiconductor
Basic depletion insulated gate FET N channel
Basic depletion insulated gate FET P channel

Note: The circuit symbols for FETs are marked with D, G and S for drain, gate and source. These letters are not normally included in circuit diagrams, but they are included here for clarity and explanation.