How to Choose the Right Thyristor for Your Project

Your Guide to buying the best Thyristor


A thyristor buying guide is a useful resource for anyone looking to purchase or use a thyristor. A thyristor is an electronic switch that can be used to control the flow of electricity in a circuit. This guide will provide key information to consider when selecting and purchasing a thyristor, such as understanding the types of thyristors, the features and specifications to look for, and the advantages of using a thyristor. Additionally, the guide will provide details on how to safely install and use a thyristor. By the end of the guide, readers should have a better understanding of the different types of thyristors available, the features and specifications to look out for, and how to safely use them.

Key features

  1. Voltage and Current Ratings: Understand the thyristor’s voltage and current rating before purchase; this will determine the type of load it can handle and its power capacity.
  2. Switching Speed: Look at the thyristor’s switching speed; this is the period in which the device changes from its off state to its on state.
  3. Triggering Circuit: Consider the triggering circuit used to turn on the thyristor; the circuit must be able to provide sufficient energy to activate the thyristor.
  4. Repetitive Rate: Determine the thyristor’s repetitive rate, which is the number of times the device can turn on and off in a given period of time.
  5. Package Type: Choose the most appropriate package type for the thyristor; the package type will affect the thyristor’s performance.
  6. Cooling System: Consider the cooling system used in the thyristor; this is important for ensuring the thyristor’s longevity and reliability.

See the most popular Thyristor on Amazon

Important considerations


  • High Voltage and High Current Ratings: Thyristors are capable of switching higher voltages and currents than conventional transistors, making them ideal for heavy-duty applications.
  • High Efficiency: Thyristors offer high efficiency when switching high currents, reducing losses from heat and increasing efficiency.
  • High Reliability: Thyristors are known for their high reliability when used in high-power applications due to their rugged construction.
  • Fast Switching: Thyristors can switch very quickly, which is useful in applications requiring fast response times.
  • Low Cost: Thyristors are generally less expensive than other electronic components, making them a cost-effective solution for many applications.
  • Easy to Use: Thyristors are easy to use and have a simple structure, making them a suitable choice for many applications.


  • Power Loss - Thyristors can suffer from significant power loss due to the need for additional resistance in the circuit.
  • Heat Dissipation - Thyristors generate heat as a result of their current flow and this can lead to thermal instability issues.
  • Reverse Blocking - A thyristor can become reverse blocked, meaning that current can't flow in the reverse direction, limiting the applications and versatility of the device.
  • Slow Switching - Compared to other switching devices, thyristors are much slower to switch, requiring more time for them to turn on or off.
  • Expense - Thyristors are generally more expensive than other switching devices, making them less attractive for cost-sensitive applications.

Best alternatives

  1. MOSFET - A metal-oxide-semiconductor field-effect transistor (MOSFET) is a type of transistor that is formed by switching an electric current or voltage between two terminals separated by a thin dielectric layer. MOSFETs are often used to switch and amplify electronic signals.
  2. BJT - The bipolar junction transistor (BJT) is a type of transistor that uses two types of charge carriers, electrons and holes, that move across a junction between two materials. BJTs are often used for amplification, switching, and voltage regulation.
  3. SCR - The silicon-controlled rectifier (SCR) is a four-layer semiconductor device, composed of a control terminal, main terminal, an anode, and a cathode. This type of device is typically used to switch high-voltage AC or DC signals.
  4. IGBT - The insulated-gate bipolar transistor (IGBT) is a type of transistor that combines the characteristics of a bipolar junction transistor and a field-effect transistor. It is used for high-current, high-voltage switching applications.

Related tools, supplies, and accessories

  • Power Supply - necessary to provide the energy necessary to activate the Thyristor.
  • Capacitor - helps regulate the flow of voltage and current through the Thyristor.
  • Inductor - helps to store the energy necessary to operate the Thyristor.
  • Resistor - helps to limit the amount of current flowing through the Thyristor.
  • Protective Cover - shields the Thyristor from potential damage or dust.
  • Heat Sink - helps to dissipate the heat generated by the Thyristor.
  • Test Instruments - allows for the testing and monitoring of the Thyristor.

Common questions

  1. What is a Thyristor? A Thyristor is a type of semiconductor device that acts as an electronic switch. It is capable of controlling and regulating the flow of electric current. It is used in various applications such as motor control, lighting control, and over-current protection.
  2. What different types of Thyristors exist? There are several different types of Thyristors, including SCRs (silicon controlled rectifiers), Triacs (triode AC switches), AC switches, and DIACs (diode AC switches).
  3. What are the advantages of using a Thyristor? Thyristors provide several advantages, such as high switching speed, low power loss, and good isolation characteristics. They are also capable of controlling large amounts of power, making them ideal for power electronic circuits.
  4. What factors should I consider when purchasing a Thyristor? When purchasing a Thyristor, you should consider the device's voltage and current ratings, its switching speed, and its size and weight. You should also consider the type of load the Thyristor will be controlling, as well as any other specific requirements you may have.
  5. Where can I buy Thyristors? Thyristors can be purchased from electronics distributors, online retailers, and manufacturers. It is important to read reviews and compare prices before making a purchase.


In the 1950s, the first thyristor devices had to be cooled with liquid nitrogen to keep them from overheating. This was necessary because while the thyristor was more efficient than a vacuum tube, it also dissipated much more heat. This meant that in order to keep them from burning out, they had to be cooled with liquid nitrogen. Thankfully this is no longer necessary, and modern thyristor devices can operate at much higher temperatures without the need for any special cooling. [Source: Electronics Hub](

Disclaimer: This buying guide was not created by humans, and it is possible that some of it's content is inaccurate or incomplete. We do not guarantee or take any liability for the accuracy of this buying guide. Additionally, the images on this page were generated by AI and may not accurately represent the product that is being discussed. We have tried to convey useful information, but it is our subjective opinion and should not be taken as complete or factual.