How many types of diodes are there?

Diodes are semiconductor devices that allow current to flow through a single direction only. Based on the applications, there are various types of diodes as follows:

Types of Diode

Large Signal Diode

Large signal diodes have large PN junction layer. These diodes are mainly used in battery charging devices like an inverter. The high current and voltage performance of these diodes are desirable for electrical devices which are used to suppress high peak voltages.

Small Signal Diode

Small signal diodes are mainly used in radios and televisions. The characteristics of the diode vary based on the doping material.

Light Emitting Diode

Light-emitting diodes (LED) have a wide range of applications ranging from mobile phones to large advertising billboards. A light-emitting diode is an electric component that emits light when the electric current flows through it. It is a light source based on semiconductors. When current passes through the LED, the electrons recombine with holes emitting light in the process.

It is represented as follows:

Light Emitting Diode

Zener Diode

A Zener diode is a heavily doped semiconductor device that is designed to operate in the reverse direction. The circuit symbol of Zener Diode is given as follows:

Zener Diode

Zener diode is used as a Shunt voltage regulator for regulating voltage across small loads. They are also used in over-voltage protection and clipping circuits.

Schottky Diode

A Schottky diode is known by several names sush as barrier diode, hot-electron diode, hot carrier diode and majority carrier diode. Schottky diode is a unipolar device in which the conduction of current happens only due to the movement of electrons. Schottky Diodes are used in solar cell applications and are used as power rectifiers. The forward voltage drop of the Schottky diode is low between 0.2 to 0.3 volts. The VI characteristics of Schottky diode is given below:

VI Characteristics of Schottky Diode

Varactor Diode

Varactor diode is a type of diode whose internal capacitance varies with respect to the reverse voltage. It always works in reverse bias condition and is a voltage-dependent semiconductor device. Symbolically, a varactor diode is represented as follows:

Varactor Diode Symbol

They are widely used in the electronics industry.

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