Transistor Schematic symbols 


               


Transistor Schematic Symbols

Transistor


In this article, we show the schematic symbols for various types of transistors.

So below are the tables for various types of transistors.


BJTs
NPN bipolar junction transistor (BJT) symbol
PNP






JFETs
N channel JFET symbol
P channel JFET symbol






MOSFETs
Enhancement Type
N-channel enhancement type MOSFET symbol
P channel enhancement type MOSFET symbol
Depletion Type
N channel depletion type MOSFET symbol
P channel depletion type MOSFET symbol
Power MOSFETS
N channel power MOSFET symbol
P channel power MOSFET symbol






UJTs
N channel unijunction transistor (UJT) symbol
P channel unijunction transistor (UJT) symbol






Phototransistors
NPN phototransistor symbol
PNP phototransistor symbol



Bipolar juction transistors (BJTs) are current-controlled transistors composed of up 3 terminals: the base, the collector, and the emitter.

NPN BJTs are bipolar junction transistors that are composed of 2 N-material junctions and 1 P-material junction.

PNP BJTs are bipolar junction transistors that are composed of 2 P-material junctions and 1 N-material junction.

This fundamental composition difference between NPN and PNP transistors gives them different operation when controlling them.


JFET transistors stand for junction field effect transistors.

JFETs are voltage-controlled transistors composed of 3 terminals: the gate, the drain, and the source.

N-channel JFETS are composed of a majority of electrons, while P-channel JFETs are composed of a majority of holes. This internal composition difference differs their operation.


MOSFET transistors stand for metal oxide field effect transistors.

There are chiefly 2 types of MOSFETs: enhancement-type and depletion type. Both types come in N-channel and P-channel form.

Power MOSFETs are MOSFETs designed to handle a much larger power load (current and voltage) than regular MOSFETs. Power MOSFETs come in N-channel and P-channel types.


Unijunction transistors (UJTs) are three-lead transistors that act exclusively as electrically controlled switches; they are not used as amplifiers.

Unijuction transistors come in N-channel and P-channel types.


Phototransistors are transistors that are turned on and operated by light. When there is sufficient light to the base of the transistor, current conducts across the emitter-collector terminal.

Phototransistors come in NPN and PNP varieties.


Related Resources

Electronic Schematic Symbols

Capacitor Schematic Symbols

Types of Transistors

BJT vs FET (Transistors)

JFET vs MOSFET (Transistors)

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