Diode symbols

About the diode symbol

The diode is a key component in electronic devices. It is a common tool for controlling current flow. Its symbol looks like a triangle pointing at a line. This denotes its one-way current conduction property. It is used extensively in circuits for rectification, signal modulation, and protection.

Knowledge of the diode symbol is essential for designing circuits from the circuit diagram and further use of diodes in the circuit. The diode symbol is important in power supplies, LED circuits, and logic gates. It can improve both productivity and precision.

Standard diode

The standard diode symbol is a triangle pointing towards a vertical line. It allows current to flow in one direction only. So, it is ideal for rectification, like converting AC to DC.

LED

The symbol for an LED is an arrow out from the diode to signify light output. Manufacturers use LEDs in indicators, displays, and lighting applications.

Zener diode

The Zener diode symbol has a curved line at the cathode end. It operates in reverse current once the voltage surpasses a specific value, which is useful for voltage control.

Photodiode

The photodiode symbol consists of arrows directed toward the diode symbol meaning light sensing. Photodiodes convert light energy into electrical energy. They are used in sensors and optical devices.

Schottky diode

The Schottky diode symbol has an S-like curve drawn on the cathode side of the symbol. It is for high-speed switching and low-voltage drop apps, including power supply.

Gunn diode

The symbol that defines the Gunn diode stands for a particular diode that is used for generating microwave signals. It is primarily used in radar and communication systems that require oscillation.

Breakdown diode

The breakdown diode symbol is a standard diode with labels. They indicate the diode's ability to work under high reverse voltage. It serves as voltage control and as a circuit protection device.

Diode vacuum tube

This symbol of the vacuum diode has a space between the anode and cathode. It shows that the device works under vacuum conditions. It is used in high-voltage rectifiers and historical radio technologies.

Tube diode

The symbol of a tube diode stands for a thermionic diode that utilizes a vacuum tube. This is used in early electronics classes for signal detection, rectification, and amplification.

Four-layer diode

The symbol of a four-layer diode indicates its layered structure. It is a thyristor-like device. It is used in high-power switching and controlled rectification.