Types of Diode and their Uses

Types of Diode and their Uses

Let’s learn and understand my great article what is “diode”  inside the category of an electronic component.

What is the diode?

The diode is a semiconductor P and N junction Electronic device. It has two legs or two terminals, the First terminal is denoted by Anode and the Second terminal is denoted by Cathode. It is also called a (passive) device.

Performing tasks and ability.

This diode is the ability and performs task is to passed free electrons is only one-way path that’s called forward biasing.

And another way in reverse bias the free electrons can not be passed or current should be blocked in the reverse direction.

That the way it is known as unidirectional current ability.

Any electronic device like resistors, Transistors, capacitors, inductors, and the diode is commonly used in electronic gadgets or circuit, each of them have own application and principle of uses.

A  diode is performing a task is to convert AC current into pulsating DC current.


That pulsating DC current is attached combination of relevant circuit called filter circuit inside attach some capacitor to achieve pure DC current and that pure DC current is used in power supplies circuits and another power-related circuit. that kind of circuit is denoted and can be said in” RECTIFIER” circuits.

Symbol of Diode

diode symbol



As per showing the symbol of the diode, the Arrow indicates the follow of free electrons in the direction of the anode to cathode forward biased and block to flow the current into cathode to Anode.

Positive and Negative Terminals.

It is a point to be noted there, Anode terminal is also to be connected to the positive electric source and the cathode terminal is also to be connected to the negative electrical source of power.

Construction and working principle of the diode.

To understand the very basic principle of operation of the diode, Let look at the figure they are constructed to find out why the diode flows the current only one-way path.

The diode is made by merge two equal layers semiconductor material and equally doped or merge P-type and N-type semiconductor material, when these two semiconductors are merging or joined together, something happened very interesting thing, suddenly these two materials layers made another little tiny layer in between them and that small layer is called the depletion layer.

The P-type layer has an excess hole and the N-type layer has excess electrons and has both tiny layers try to diffuse into each other making a powerful resistance blocking between both of the semiconductor materials, This blockage layer is also denoted or called depletion layer.


When the flow of free electron or source of electric power is applied in the diode the (blockage) layer has to be broken, when an electric source is applied to the anode terminal (+) and cathode terminal (-) is applied to the negative source of power, these phenomena, said to be in forward biased condition, During that condition, the positive source will suck or pump more holes into the p-type region and the negative source will suck more electrons into the N-type region, which happens the depletion layer to breakdown causing the current to flow from Anode to Cathode.

This small source of voltage needed to make the diode working condition in a forward direction is known as the forward breakdown voltage.

And another way in alter direction, when a negative source or power is applied to the Anode and positive is applied to the cathode the diode is said to be in reverse bias direction, During that state, the negative source will suck in more electrons to P-type and also N-type semiconductor material can get more holes from positive electric source that can produce the depletion layer more stronger and thus ability to allow no current to pass through it.

Type of diode.

  • Zener diode
  • P-N junction diode.
  • Photodiode.
  • Varactor diode.
  • Avalanche diode.
  • Pin diode.
  • Lazer diode.
  • Tunnel diode.
  • Schottky diode   

Zener diode.

zener diode

Zener diode is a most important special type of diode, which allow to flow of free electron( I) in the forward direction, but Zener diode is ability to perform task is also allowed to flow of free electrons in the opposite or reverse bias, If the source of power is above certain amount this phenomenon is known as breakdown voltage and called Zener diode.

P-N Junction diode

diode symbol

The P-N Junction diode is two terminals diode one of the side is doped with P-type material and another side is N-type material. And has a common basic semiconductor diode and have allow the current only one-way path and that way is Anode to the cathode.

Tunnel diode

The Tunnel diode is a strongly heavy doped P-N junction diode, which ability to flow of free electron decreases as the source of electric power or input power increasing.

Varactor diode.

That kind of diode is mostly used in radio frequency gadgets or RF circuit and have the ability to give voltage-controlled variable capacitance field. In that way when need capacitance level control by the source of electric power ( voltage ) and also can be denoted by varicap diode.

Schottky Diode.

That kind of diode allows then little forward drop voltage as compared to the PN junction diode. They have much faster work in reverse recovery timing and fastest switching speed due to the less junction capacitance and used in voltage clamping circuits.

Avalance diode.

That kind of diode is used for the flow of current in the reverse direction when the reverse bias voltage is more to the breakdown voltage and feed to high current.

This type of diode is characterized by its construction. it’s the quality P-type & N-type regions, however, the world between the 2 regions particularly intrinsic semiconductor has no doping. The region of the intrinsic semiconductor has the result of skyrocketing the world of the depletion region which might be helpful for change applications.



The photodiode is an ability and performs the task to convert light energy into electric current, and construction to make photodiode in semiconductor material like P-N type.


light emitting diode

Led is stand for Light Emitted Diode, and have ability is to work when a small amount of current is passing through P-N junction and performing output to give little light or give diode brightness, and have widely used in 7 segment display unit and some indication and decoration purpose used.


PIN diode

The PIN-diode is the associate alteration of the PN-junction for explicit applications. when the PN-junction diode was developed within the year Forties, the diode was initially exercised as a high-powered rectifier, low-frequency throughout the year 1952. The prevalence of the associate intrinsic layer will considerably increase the breakdown voltage for the appliance of high-voltage. This intrinsic layer additionally offers exciting properties once the device operates at high frequencies within the vary of radio radiation and microwave. A PIN diode could be a one quite diode with associate undoped, wide intrinsic semiconductor region between a P-type and semiconductor region. These regions square measure unremarkably heavily doped as they’re used for resistance unit contacts. The wider intrinsic region is indifferent to a standard p–n diode. This region makes the diode associate inferior rectifier however it makes it acceptable for quick switches, attenuators, image detectors, and high voltage power physical science applications.

define of PIN Diode Chip

What is a PIN Diode?

The PIN diode could be one kind of image detector, accustomed convert optical signal into an associated electrical signal. The PIN diode contains 3 regions, specifically P-region, I-region, and N-region. Typically, each of the P and N regions square measure heavily doped because of they’re utilized for resistance unit contacts. The intrinsic region within the diode is in distinction to a PN junction diode. This region makes the PIN diode associate lower rectifier, however, it makes it acceptable for quick switches, attenuators, image detectors, and applications of high voltage power physical science.



Laser diode

An optical device diode, additionally called associate injection optical device or diode optical device, could be a conductor that produces coherent radiation (in that the waves square measure all at a constant frequency and phase) within the visible or infrared (IR) spectrum once current passes through it. optical device diodes square measure utilized in glass fiber systems, recording (CD) players, optical device printers, remote-control devices, and intrusion detection systems.

An optical device Diode could be a conductor the same as a junction rectifier (LED). It uses tangency to emit coherent light-weight during which all the waves square measure at constant frequency and section. This coherent light-weight is created by the optical device diode employing a method termed as “Light Amplification by stirred Emission of Radiation”, that is abbreviated as an optical device. And since a tangency is employed to supply optical device light-weight, this device is called as an optical device diode. Before we have a tendency to learn additional concerning the operating method of an optical device diode, let’s verify however optical device light-weight is completely different from alternative kinds of light-weight, and its benefits.
The light-weight from daylight or from most of the substitute light sources contains waves of multiple wavelengths and that they square measure out of the section with one another. {the light-weight|the sunshine} waves from monochromatic light sources like incandescent bulb are also not in section with one another. In distinction to the previous light-weight sources, optical device diodes turn out a slender beam of optical device light-weight during which all the sunshine waves have similar wavelengths and that they travel along with their peaks lined up. this is often why optical device beams square measure terribly bright and may be centered over a really small spot. Of all the devices that turn out optical device light-weight, optical device diodes or semiconductor lasers square measure the foremost economical and that they are available smaller packages. in order that they square measure wide utilized in varied devices like optical device printers, barcode readers, security systems, Autonomous vehicles (LIDAR), Fiber optic communications, etc.






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The diode is a semiconductor P and N junction Electronic device. It has two legs or two terminals, the First terminal is denoted by Anode and the Second terminal is denoted by Cathode. It is also called a (passive) device.
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