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Feb 28 2019

Diode Physical Maps and Symbols

Warm hints: This article contains about 2500 words and reading time is about 15 mins.

Introduction

Among the electronic components, a diode is a device having two electrodes, which only allows current to flow in a single direction, and many uses a rectifying function. The varactor is used as an electronically tunable capacitor. The current directionality of most diodes is often referred to as the "rectifier" function. The most common function of a diode is to allow only current to pass in a single direction (called forward bias) and reverse in reverse (called reverse bias). Therefore, the diode can be thought of as an electronic version of the check valve.

Schematic Diagrams & Symbols, Electrical Circuits - Resistors, Capacitors, Inductors, Diodes, & LEDs

Catalog

Introduction

Ⅰ Types of Diodes

1.1 Rectifier Diodes

1.2 Zener Diodes

1.3 Light-emitting Diode

1.4 Schottky Diodes

1.5 Fast Recovery Diode

1.6 Constant Current Diode

1.7 Transient Voltage Suppressor

1.8 Bidirectional Trigger Diode

1.9 Varistor Diode

1.10 Tunnel Diode

1.11 Other Types

Ⅱ Diode Symbols


Ⅰ Types of Diodes

1.1 Rectifier Diodes

In diode circuits, the application of rectifier diodes is the most common. The so-called rectifier diode is a diode specifically used in a power supply circuit to convert alternating current into one-way pulsating direct current.

Rectifier Diode

Fast recovery diode is a kind of semiconductor diode with good switching characteristics and short reverse recovery time. It is mainly used in electronic circuits such as switching power supply, PWM pulse width modulator and inverter, as high frequency rectifier diode, freewheeling diode or Damping diodes are used.

Fast Recovery Rectifier Diode

Rectifier diode is a semiconductor device used to convert alternating current into direct current. The most important characteristic of a diode is its unidirectional conductivity. In the circuit, current can only flow from the positive pole of the diode and the negative pole flows out.

Rectifier Diode - Silicon Tube

The rectifier bridge is to seal several rectifier tubes in one shell to form a complete rectifier circuit. A three-phase rectifier circuit is proposed when power is further increased or multiphase rectification is required for other reasons. The three-phase rectifier bridge is divided into three-phase full-wave rectifier bridge (full bridge) and three-phase half-wave rectifier bridge (half bridge). Select the rectifier bridge to consider the rectifier circuit and operating voltage. A rectifier circuit that requires a high output voltage requires a capacitor, and a capacitor of a rectifier circuit that does not require a high output voltage can be mounted or not.

 

1.2 Zener Diodes

Zener diodes or reverse breakdown diodes, have different characteristics than ordinary diodes. Regenerative diodes are mainly used to stabilize the DC operating voltage and can also be used to limit the signal.

Zener diodes

 

1.3 Light-emitting Diode

Light-emitting diodes are referred to as LEDs and are commonly used to indicate the operating state of the circuit and various signals.

LED

LED

 

1.4 Schottky Diodes

Schottky diodes are primarily used for rectification and freewheeling of circuits. It is widely used in switching power supplies, inverters, drivers and other circuits. Do high frequency, low voltage, high current rectifier diodes, freewheeling diodes, protection diodes, or rectifier diodes, small signal detection diodes, etc. in microwave communication.

Schottky Diodes

 

1.5 Fast Recovery Diode

Fast recovery diodes are used in switching power supplies, pulse width modulators (PWM), uninterruptible power supplies (UPS), AC motor variable frequency speed regulation (VVVF), high frequency heating, etc., as high frequency, high current freewheeling or rectifier diodes.

Fast Recovery Diode

 

1.6 Constant Current Diode

The constant current diode can output a constant current over a wide voltage range and has a high dynamic impedance. Can be used to stabilize and limit current. Mainly used in low power, such as constant current source, voltage regulator, amplifier and electronic circuit protection circuit.

Constant Current Diode

Constant Current Diode

 

1.7 Transient Voltage Suppressor

It also known as transient voltage suppression diode, two-way breakdown diode, referred to as TVS. The transient suppression diode is not broken down. It can reduce the resistance when the voltage is extremely high, divert the current or control its flow direction, thus protecting the circuit components from being burnt out if the transient voltage is too high.

Transient Voltage Suppression Diode

 

1.8 Bidirectional Trigger Diode

Also known as the two-terminal AC device DIAC or bidirectional diode. It is often used to start a bidirectional thyristor, and can also constitute an overvoltage protection circuit.

Bidirectional Trigger Diode

Bidirectional Trigger Diode

 

1.9 Varistor Diode

The varistor diode is made by the principle of variable resistance between PN junctions. It is mainly used in 10-1000MHz high-frequency circuits or switching power supplies, etc. It can be used as an adjustable attenuator, limiting, and protection.

Varistor Diode

1.10 Tunnel Diode

Also known as the Jiangsaki diode, it is a diode with a tunneling current as the main current component. It has a simple structure, fast change speed and low power consumption. Widely used in high speed pulse counting. Tunnel diodes can be used to form bistable circuits, monostable circuits, multivibrators, and for shaping and frequency division.

Tunnel Diode

 

1.11 Other Types

Double base diode also known as a single-cell transistor, it is a three-terminal negative resistance device with a PN junction. It is widely used in a variety of oscillators, timers and controller circuits.

Double Base Diode

Double Base Diode

 

The magnetic diode can generate a higher output voltage under the action of a weak magnetic field, and synchronously output positive and negative voltages as the direction of the magnetic field changes. It is widely used in magnetic detection, current measurement, non-contact switch, displacement measurement, speed measurement, automatic control of brushless DC motor.

Magnetic Sensitive Diode

 

At a certain bias current, the voltage drop of the PN junction of the temperature sensitive diode is a function of temperature. For every degree of temperature increase, the forward voltage drop of the temperature sensitive diode PN junction drops by 2 mV. Used for temperature measurement circuits.

Temperature Sensitive Diode

 

Precision diode, Referred to as PD, precision diode is a high-precision diode with stable voltage and stable current. It has a wide operating temperature, good linearity and very high stability. Commonly used in constant current sources or constant voltage sources in various electronic circuits.

Precision Diode

 

For photodiode, a device that converts an optical signal into an electrical signal. When there is light, the resistance is small, the current is large, and when there is no light, the resistance is large and the current is small.

Photodiode

Photodiode

 

Infrared light-emitting diodes (LEDs) are diodes that emit infrared light and are commonly used in remote control applications.

Infrared Emitting Diode

Infrared Emitting Diode

 

One of the features of laser diodes is the ability to modulate the intensity of their output light directly from the current. Because there is a linear relationship between the output optical power and the input current, the laser diode can directly modulate the intensity of the output light with analog or digital current.

Laser Diode

Laser Diode

 

Lightning protection diode, often used to protect voltage-sensitive telecommunications equipment from lightning surges and transient surge voltages generated by equipment switching to damage them. The GDT is a high impedance component.

Lightning Protection Diode

Lightning Protection Diode

 

The detector diode is a device for detecting a low-frequency signal superimposed on a high-frequency carrier, and has high detection efficiency and good frequency characteristics.

Detector Diode

Detector Diode

 

Ⅱ Diode Symbols

 Diode Symbol

 Diode Symbol

 Diode Symbol

 Diode Symbol

 

 Diode Symbol

Diode Symbol

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Diode Symbol

Diode Symbol

Diode Symbol

Diode Symbol

 

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