Diode Circuit Symbols

Views:9     Author:Site Editor     Publish Time: 2020-07-06      Origin:Site

There are many different forms of diode and for most types there is a distinct circuit symbol.

Some of the major types of diode include the PN junction, Schottky, varactor, Zener or avalanche reference diode, photo diode, light emitting diode. For all of these there are distinct circuit symbols. Each of these diode circuit symbols incorporates the basic diode format, but is modified to indicate the different function. 

Table: Diode Circuit Symbols

Symbol

Name

Description

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

Schottky Diode

A diode with low voltage drop

varicap diode

Varactor / Varicap Diode

Variable capacitance diode

tunnel_diode

Tunnel Diode

A heavily doped p-n junction diode in which the electric current decreases as the voltage increases.

led

Light Emitting Diode (LED)

LED emits light when current flows through

photodiode

Photodiode

Photodiode allows current flow when exposed to light

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