All Types of Transistor Symbol and Diagram


A transistor is an electronic semiconductor device. Its main function is to switch or amplify electronic signals. The transistor is a very useful active electronic component and is used in all digital electronic circuits as well as some analog electronic circuits. The transistor is a three-terminal device and it requires an external voltage or biasing for its operation. According to construction, operation, working principle, and applications, there are so many different types of transistors available.

Here, you can see the list of different types of Transistor,

All Types of Transistor Symbol and Diagram, symbol of transistor




  • Bipolar Junction Transistor or BJT
  • PNP Transistor
  • NPN Transistor
  • Field Effect Transistor or FET
  • Junction Field Effect Transistor or JFET
  • N-Channel JFET
  • P-Channel JFET
  • Metal oxide semiconductor field-effect transistor or MOSFET
  • Unijunction Transistor or UJT
  • Depletion mode N-Channel MOSFET
  • Depletion mode P-Channel MOSFET
  • Enhancement Mode N-Channel MOSFET
  • Enhancement Mode P-Channel MOSFET
  • NPN Darlington Transistor
  • PNP Darlington Transistor





BJT or Bipolar Junction transistor is the simplest transistor among others. It is a three-terminal device named - Collector, Base, and emitter. Here, you can see the symbol of BJT or Bipolar Junction Transistor.

Bipolar Junction Transistor(BJT) Symbol, Symbol of BJT




NPN transistor is a type of bipolar junction transistor. It has two N-type layers and one P-Type layer. NPN transistors are most suitable for high-frequency applications and have so many advantages over PNP Transistors. Here, you can see the symbol of the NPN transistor.

NPN Transistor Symbol, symbol of NPN Transistor, NPN Transistor Diagram




PNP transistor also a type of Bipolar Junction Transistor. It has two P-Type layers and one N-type layer. In some electronic circuits, the PNP transistor is more useful than the NPN transistor. Here, you can see the symbol of the PNP Transistor.

PNP Transistor Symbol, symbol of PNP Transistor, PNP Transistor Diagram






Field Effect Transistor or FET is a voltage control device. This means when a voltage is applied to its gate terminal it starts conducting current. There are two types of Field Effect transistors - JFET and MOSFET.
In an N-channel JFET electrons is the charge carrier. Here, you can see the symbol of N-Channel JFET.

n channel JFET symbol, symbol of n channel JFET, n channel jfet diagram




In a P-Channel, JFET holes are the majority charge carrier. Here, you can see the symbol of P-Channel JFET.

p channel JFET symbol, symbol of p channel JFET, p channel jfet diagram




UJT or Unijunction Transistor is also a three-terminal device but it has only one junction. UJT is an ultra-fast electronic switch. Here, you can see the symbol of UJT.

Unijunction Transistor UJT symbol, Symbol of UJT, UJT Diagram






MOSFET or Metal Oxide Semiconductor Field Effect Transistor is mainly designed for fast switching and high current carrying features. It has a metal oxide layer. There are mainly two types of MOSFET - Depletion Type MOSFET and Enhancement Type MOSFET.

Depletion Type MOSFET has two types - Depletion type N-Channel MOSFET and Depletion type P-Channel MOSFET


Symbol of Depletion mode N-Channel MOSFET

N Channel depletion Type MOSFET Symbol




Symbol of Depletion mode P-Channel MOSFET

P Channel depletion Type MOSFET Symbol




Enhancement Type MOSFET has two types - Enhancement Type N-channel MOSFET and Enhancement Type P-Channel MOSFET


Symbol of Enhancement Type N-channel MOSFET

N Channel enhancement Type MOSFET Symbol




Symbol of Enhancement Type P-channel MOSFET

P Channel enhancement Type MOSFET Symbol






Darlington transistor is made of two bipolar junction transistors. But is it acts as a single transistor. It also has only one base terminal, one emitter terminal, and one collector terminal. There are two types of Darlington transistor - NPN Darlington Transistor and PNP Darlington Transistor. The main difference between a Darlington transistor and a normal bipolar junction transistor is, Darlington transistor provides a very high current gain over a normal transistor.


Symbol of NPN Darlington Transistor

NPN Darlington Transistor Symbol




Symbol of PNP Darlington Transistor

PNP Darlington Transistor Symbol




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All Types of Transistor Symbol and Diagram All Types of Transistor Symbol and Diagram Reviewed by Author on 7/06/2021 Rating: 5
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