All Types of Diode Symbol and Diagrams


A diode is an electronic semiconductor device that acts as a switch for electric current. Generally, a diode allows the flow of current in one direction only without any restriction. Also, it allows the flow of current in opposite direction with some conditions.
A diode is a two-terminal device named Anode and Cathode. The polarity of the diode is very important when using in electrical or electronic circuits.
The diode is an active device because it cannot work without an external voltage. An external power supply or biasing must be applied to the diode to work.


All Types of Diode Symbol and Diagrams, Diode Types, Symbol of Diode



The different types of Diode are,

  • PN Junction Diode
  • Zener Diode
  • Schottky Diode
  • Shockley Diode
  • Avalanche Diode
  • Constant Current Diode
  • Tunnel Diode
  • Varactor Diode
  • Step Recovery Diode
  • PIN Diode
  • Gunn Diode
  • Laser Diode
  • Light Emitting Diode(LED)




PN Junction Diode

PN Junction diode is the simplest diode among others. It is a two-terminal device. In normal conditions, it allows the flow of current in one direction only. The main application of the PN Junction Diode is AC to DC converter or Rectifier Circuit. Here you can see the symbol of PN Junction Diode.

PN Junction Diode Symbol, symbol of PN Junction Diode




Zener Diode

Zener Diode also almost does the same work as a PN Junction diode. It also allows the flow of current in one direction only. Just the difference is, it allows the flow of current in the reverse direction when its terminal voltage crosses the Zener voltage. Here, you can see the symbol of the Zener Diode.

Zener Diode Symbol, symbol of zener diode





Schottky Diode

Schottky Diode is also known as a hot-carrier diode or hot barrier diode. Schottky diode is formed by the junction of a semiconductor with a metal. The advantages of a Schottky diode over a normal diode are, it has a very low forward voltage drop, very fast switching speed. Here, you can see the symbol of the Schottky diode.

schottky diode symbol, symbol of schottky diode




Shockley Diode

It is a PNPN layer diode. Its construction is almost the same as a thyristor without the gate terminal. Shockley has two PN Junctions. Also, it may have multiple PN Junctions. Until the applied voltage crosses the triggered voltage it does not allow the flow of current. Once the applied voltage crosses the triggered voltage, its resistance decrease to low and current start flow. Here, you can see the symbol of Shockley Diode.

Shockley Diode Symbol, symbol of Shockley Diode




Avalanche Diode

Avalanche Diodes are those which work in avalanche breakdown mode without damaging themselves. In general, it does not allow current, but when the voltage across it crosses the breakdown voltage it starts conducting current. Here, you can see the symbol of Avalanche Diode.

Avalanche Diode Symbol, Symbol of Avalanche Diode





Constant Current Diode

The constant current diode is also known as the current limiting diode or current regulating diode. The main function of this diode is to limit the flow of current through it under a certain value. Here, you can see the symbol of the constant current diode.

Constant Current Diode Symbol, Symbol of Constant Current Diode




Tunnel Diode

The tunnel diode is also known as Esaki Diode. It is a semiconductor device that has effective negative resistance due to the quantum effect. Tunnel Diode is a heavily doped PN Junction Diode. Here, you can see the symbol of the Tunnel Diode.

Tunnel diode symbol, symbol of tunnel diode




Varactor Diode

Varactor Diode is a voltage-dependent semiconductor device. It always works in reverse bias conditions. The main characteristic of the varactor diode is, its internal capacitance varies with the varying of reverse voltage. It is also known as Varicap diode or varying capacitor diode. Here, you can see the symbol of varactor diode.

Varactor Diode Symbol, symbol of varactor diode





Step Recovery Diode

Step Recovery Diode is also known as a snap-off diode or charge storage diode. It is a specially designed extremely short pulse signal. The doping density of the step recovery diode is extremely low. Here, you can see the symbol of the step recovery diode.

Step Recovary Diode Symbol, symbol of Step Recovary Diode




PIN Diode

A PIN Diode is made up by inserting an undoped intrinsic semiconductor material between the P-type semiconductor and N-type semiconductor regions. So, it has an extra layer between the P and N Junctions. This differs the PIN diode from a regular diode. Here, you can see the symbol of the PIN Diode.

PIN Diode Symbol, Symbol of PIN Diode




Gunn Diode

Gunn diode is an electronic semiconductor device made up of only N-type semiconductor material. There is no P-type semiconductor material in the Gunn diode. Gunn Diodes are mainly used to create microwave signals. Gunn diode also has negative resistance property. Here, you can see the symbol of Gunn Diode.

Gunn Diode Symbol, Symbol of Gunn Diode





Light Emitting Diode(LED)

A light-emitting diode or LED is a special type of diode that emits light when connected to a power supply in the forward bias. In reverse bias, it cannot work or emit light. LED made up of a special type of semiconductor material such as Aluminium indium gallium phosphide(AlInGiP). Here, you can see the symbol of LED.

LED Symbol, Symbol of LED(Light Emitting Diode)




Laser Diode

A laser Diode is also a semiconductor device almost similar to a light-emitting diode. It emits coherent light from its PN junction. The Laser Diode uses the process of "Light Amplification by Stimulated Emission of Radiation". Here, you can see the symbol of Laser Diode.

Laser Diode Symbol, Symbol of Laser Diode




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All Types of Diode Symbol and Diagrams All Types of Diode Symbol and Diagrams Reviewed by Author on 6/28/2021 Rating: 5
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