Diode Symbols

A diode is a mini electronic tool which is used to control the direction of the current usually it makes the flow in one direction. There is a number of diodes available in different designs which have different features and functionality. This page brings a table containing a variety of diodes with their symbols, features and main functions. 


Diode schematic symbols of electronic circuit - Diode, LED, Zener diode, Schottky diode, photodiode, ...

Left - Anode, Right - Cathode.

Symbol Name Description
diode symbol Diode Diode allows current flow in one direction only (left to right).
zener diode Zener Diode Allows current flow in one direction, but also can flow in the reverse direction when above breakdown voltage
schottky diode symbol Schottky Diode Schottky diode is a diode with low voltage drop
varicap diode symbol Varactor / Varicap Diode Variable capacitance diode
tunnel diode symbol Tunnel Diode  A diode with negative resistance caused by quantum mechanical effect called tunnelling
led symbol Light Emitting Diode (LED) LED emits light when current flows through
photodiode symbol Photodiode Photodiode allows current flow when exposed to light

Diodes and  their features

This table offers different diodes and their symbols with main features. A diode allows the current in one direction which was initially left to right but now there is a huge variety of diodes which can also reverse the current direction as well as in more than one direction.


Here you can get a simple diode which flows electric current from left to right direction, a Zener diode which flows electric current from left to right but when current exceeds breakdown voltage this diode reverses the current direction, a low voltage drop Schottky diode, a negative resistance tunnel diode, a light-emitting diode which emits light whenever current passes from it, and a light-dependent photodiode which allows current only when it is exposed to light. you can find all these diodes their symbols and their basic purpose. 

What are the symbols of diode?

The most basic symbolism for diodes resembles an arrowhead that indicates the direction of normal flow of current through its Anode (A) terminal through its Cathode (K) terminal. The symbolism of a diode also indicates that if it is it is biased forward, the current flows through the arrow's direction.

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