A diode is a two-terminal electronic component that conducts electric current primarily in one direction. It is made of semiconductor material, such as silicon, and has a positive terminal (the anode) and a negative terminal (the cathode). 

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Buy diode Online in India

An electronic component that primarily permits current flow in one direction is known as a diode. It has high resistance in one direction and low resistance in the opposite direction. A diode is comprised of two terminals, a cathode (negative lead) and an anode (positive lead). Semiconductor diodes, which are a crystalline piece of semiconductor material with a p-n junction linked to two electrical terminals, are the most commonly used type of diode. The p-n junction is formed by combining a p-type semiconductor (which has holes as charge carriers) and an n-type semiconductor (which has electrons as charge carriers). Current flows through the diode when a positive voltage is applied to the anode.

Diodes are utilized in numerous applications, such as rectifiers to transform AC power to DC, voltage regulators, signal limiters, switches, signal modulators, signal mixers, signal demodulators, and oscillators.


Diode working principle

A diode is a crucial electronic component that allows the flow of electric current in one direction and blocks it in the opposite direction. It is composed of p-type and n-type semiconductors that interact to control the current flow. The diode has two main states, forward-biased and reverse-biased, where it permits or restricts current flow, respectively. Its primary purpose is to act as a switch for current in one direction, making it a vital component in rectifiers, voltage regulators, and signal limiters.


Advantages of diode

Diodes have several advantages in electronics, including:

  • Protecting electrical circuits from damage due to short circuits, overvoltage, and overcurrent
  • Converting AC to DC, which is useful for powering devices that require DC power
  • Rectification, voltage regulation, and amplification
  • Low cost, easy to use, and wide availability
  • Compact size and compatibility, making electronic circuit design simple

Applications of diode

Diodes have various applications and they are used in electronics, including:

  • Rectification, which involves converting AC to DC
  • Switching, which involves turning a circuit on and off
  • Source isolation, which involves separating two circuits
  • Voltage reference, which involves providing a stable voltage
  • Frequency mixing, which involves combining two signals to create a new frequency
  • Diode detection, which involves detecting radio frequency signals
  • Light source, which involves emitting light when current flows through the diode
  • Protection circuits, which involve protecting electrical circuits from damage due to short circuits, overvoltage, and overcurrent
  • Logic gates, which are circuits that can be used to perform logical operations
  • Flyback circuits, which involve storing energy in an inductor and releasing it when the diode is turned off.

Diode Prices in India 




650nm 6mm 5V DC Mini Laser Dot Diode Module


1N4007 Diode - (Pack of 10)


1N4148 Diode - (Pack of 10)


Bridge Rectifier (Pack of 5)


1N5819 Diode (Pack of 5)


1N5408 Diode - (Pack of 10)



1.What is a diode used for?

  • A semiconductor component known as a diode permits the flow of electric current in only one direction. Its utility includes conversion of AC power to DC power as a rectifier, limitation of signals, voltage regulation, switching, modulation, mixing, demodulation, and oscillation. Additionally, diodes serve the purpose of safeguarding against overvoltage, while transient voltage suppressors, a specialized type of diode, are capable of managing significant power surges.

2.Are diodes AC or DC?

  • Diodes are versatile components that can be utilized in both AC and DC circuits. When used in AC circuits, diodes can block half of the AC current, regardless of its direction. In DC circuits, diodes allow the flow of current in only one direction, making them valuable in converting AC power to DC power as a rectifier.

3.Where can I buy laser diodes online?

  • Laser diodes are available online in online electronics stores like Robocraze

4.Where can I buy laser diodes at a shop near me?

  • Laser diodes may be available in some local electronics shops. However it is better to enquire about the specific model number you’d want before visiting the store

5.How to choose the best laser diodes, online?

  • You can choose the type of laser diode based on the reviews and cross checking your requirements and operating conditions. Since laser diodes are generally very reliable, it is uncommon to go wrong with any model.

6.What are the types of laser diodes?

  • There are few types of Laser Diodes
    • Double Heterostructure Laser Diode
    • In this type of laser diode, an additional confinement layer of a different material is sandwiched between the two p-type and n-type materials. The advantage of this DH laser diode is that the active region is confined to a thin layer which gives better optical amplification.
    • Quantum Well Laser Diode
    • The quantum well laser diode has a very thin middle layer, which acts as a quantum well. The electrons will be able to use quantum energy levels when transitioning from higher energy level to lower energy level. This gives a better efficiency for this type of laser diode.
    • Separate Confinement Heterostructure Laser Diode
    • The thin middle layer in the quantum well laser diode is very small for confining emitted light effectively. To compensate this, in the separate confinement heterostructure laser diode, another two layers are added over the three initial layers.
    • Vertical Cavity Surface Emitting Laser Diode (VCSEL)
    • All the previously discussed laser diodes, the optical cavity is placed perpendicular to the current flow. In vertical cavity surface emitting laser diodes, however, the optical cavity is along the axis of current flow.

7.What are the prices of a laser diode in India?

  • Laser modules can be bought from online stores such as Roboraze.


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