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This section provides an overview for thyristors as well as their applications and principles. Also, please take a look at the list of 17 thyristor manufacturers and their company rankings. Here are the top-ranked thyristor companies as of July, 2025: 1.Semikron Danfoss, 2.Vishay Intertechnology, Inc.,, 3.WeEn Semiconductors Co., Ltd.
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A thyristor is a semiconductor device with a rectifying action. It is also called an SCR (Silicon Controlled Rectifier). Rectification refers to the conversion of alternating current to direct current. A typical electronic component with a rectifying action is a diode.
The difference between a diode and a thyristor is the gate terminal. The thyristor has a terminal called 'the gate'. Rectifying action is only shown when current flows through the gate terminal.
Thyristors are used in industrial applications, such as the soda industry and electrolytic plating. The soda industry is an industry that electrolyzes salt water to produce caustic soda and hydrogen. Caustic soda is used as raw material for soap and detergent. A large DC current for electrolyzing salt water is generated by Thyristors.
In everyday life, thyristors are used for dimming LED lighting by controlling the current to the LEDs.
The thyristors have a PNPN quadruplex structure consisting of p-type and n-type semiconductors. The gate terminals are drawn out from n or p-type semiconductors in the middle, which are called N-gate and P-gate, respectively.
Since it has a quadruple structure, it has three junctions. Looking at the junctions from the anode side to the cathode side, the first and third junctions are forward-biased. In contrast, the second junction is reverse-biased. In this condition, a tiny current will flow if we pass the current from the anode side to the cathode side.
However, when a forward voltage is applied to the thyristors and current flows to the gate terminal, a phenomenon called avalanche breakdown occurs, and conduction occurs between the anode and cathode. This is called thyristors arc or turn-on.
After the thyristors turn on, conduction is broken when the current flowing to the anode becomes zero. This is called turn-off or quenching. Thyristor turn-off occurs naturally because the alternating current has periodic moments of zero voltage.
Thyristors are used in the power section of devices that control large amounts of power. Specific examples are listed below:
1. Rectifier
Rectification means converting alternating current to direct current. Diodes and thyristors are used for rectifiers, which are critical parts of rectifier circuits. Thyristors rectifiers are smaller and lighter than diode rectifiers but generate noise in the power system due to high frequencies. In recent years, rectifiers with transistors have been developed to suppress harmonics.
2. AC Motor Control
The equipment that controls the rotation speed of AC motors is called VVVF equipment, which consists of a converter and an inverter. The converter section converts AC power into DC power. Diodes are mainly used in the converter section.
The inverter section is a device that converts a DC power supply to an AC power supply by the reverse operation of rectification. Inside the inverter, AC power is converted to DC power once. AC current is generated by high-speed switching of the DC power supply with thyristors, etc.
*Including some distributors, etc.
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Littelfuse founded in 1927, is an industrial manufacturing company empowering a sustainable, connected, and safer world, headquartered in Chicago, Illinois, United States. The company's product portfolio includes the solutions for both individual and entire systems, as a global manufacturer of technologies in circuit protection, power control, and sensing. Across more than 20 countries, and with approximately 18,000 global associates, partner with customers to design and deliver advanced solutions. Serving over 100,000 end customers, their products are found in industrial, transportation, and electronics end markets.
The Central Semiconductor Corporation is an ISO 9001:2015-certified electronics manufacturer in Hauppauge, NY. Since it was founded in 1974, the corporation has expanded to serve the global market. Its main product line is discrete semiconductors. All products are RoHS2 and REACH compliant. The corporation also manufactures diodes, rectifiers, transistors, and protection devices. Central Semiconductor provides semiconductor solutions for several industries including alternative energy, consumer products, scientific/industrial, networking, lighting, and the medical industry.
Littlefuse was founded in 1927 and headquartered in the United States. Littlefuse is a diversified industrial technology manufacturing company with customers globally. Littlefuse has products segments which are electronic, industrial, and transportation. Electronic segment products include fuses and fuse accessories, positive temperature coefficient resettable fuses, polymer electrostatic discharge suppressors, and varistors. Transportation products include blade, resettable, and high-current and high-voltage fuses, as well as battery cable protectors; fuses, switches, relays, circuit breakers, and power distribution modules. The Industrial segment offerings include contactors, transformers, and temperature sensors for use in renewable energy and energy storage systems, electric vehicle infrastructure, HVAC systems.
Vishay Intertechnology, Inc. (Vishay) was incorporated in 1962 and is headquartered in Malvern, Pennsylvania. The company serves the industrial, automotive, telecommunications, consumer products, and medical end markets and sells its products under numerous brand names inlcuding Siliconix, Draloric, Beyschlag, UltraSource, and Applied Thin-Film Products. The company manufactures and sells discrete semiconductors and passive electronic components in globally while operating in six market segments: MOSFETs, diodes, optoelectronic components, resistors, inductors, and capacitors.
Wenzhou DAQUAN Electric Co., Ltd was founded in 1996 in Wenzhou, China. The company is an electrical products manufacturer of relays, relay sockets, timers, meters, and related components to customers both in and outside of China and serves both home appliance customers as well as industrial customers in manufacturing and other industries. The company has 5 major product segments including relays, timers, meters, circuit breakers, and switches. The company also sells various tools, alarm devices, and product accessories.
Bright Toward Industrial Co., Ltd., founded in 1988 with headquarters in Taiwan, is a manufacturer of relays and related electronic components. The company's product line includes solid-state relays, opto-MOSFET relays, opto-SiC MOSFET relays, reed relays, and RF MEMS switches used in semiconductor testing, battery management systems, automatic test equipment, industrial controls, and telecommunications. Bright’s products are found in industrial machinery and electric vehicles. The company has long-term partnerships with OKITA Works, Menlo Microsystems, JEL Systems, and Teledyne Relays and Coax Switches.
Excel Cell Electronic, founded in 1981 is a manufacturer and supplier of electromechanical components and stamping products headquartered in Taiwan. The company offers electromechanical components including industrial control switches, stepping motors, terminal blocks, resettable fuses, and relays. Their stamping products include heat spreaders for BGA, high-precision electronic components, and lead frames of semiconductors for discrete devices / integrated circuit & photoelectric products. The company is ISO/TS 16949:2009, CNS15506: 2011, TOSHMS: 2007, ISO 14001, and ISO 9001-certified, and their products are used in various applications in optoelectronic, security systems, power energy, network, and communication industries.
Cosmo Electronics Corporation has been a manufacturer of photo couplers and relays based in Taiwan since 1981. The company produces a wide range of photo couplers that are designed to give different types of output. There are also different types and forms of Reed Relay and Solid State Relay and these products have applications in the power industry such as being implemented in adapters and UPS including smoke detectors, home security panels, and cameras. They are also used in Industrial based products such as NC machine tools, robots, and solar power conditioners and also by Consumer Electronics and the Automotive Industry.
RKC Instrument has been continually growing for over half a century and strives to be a solution provider of measurement and control systems. RKC supplies quality products and professional engineering services quickly and efficiently. RKC specializes in everything from limit and multiloop controllers to heater break alarms and temperature sensors. RKC has a website in Chinese, English, and Japanese and has sales networks across the globe. Based on the management concept of “Realization of the highest quality,” RKC Instrument has obtained the accreditation of ISO9001, the international standard for quality management systems.
Renesas Electronics Corporation was established in 2002 and is headquartered in Tokyo, Japan. Renesas is a global research, design, and manufacturer of semiconductors used in industries spanning automotive, consumer electronics, the internet of things, power & energy, and industrial sectors. Renesas manufactures both analog and digital products. Analog products include amplifiers, audio & video devices, data converters, PLC, and switches & multiplexers. Digital products include microcontrollers, memory components, sensors, wireless connectivity products, and others. Renesas also offers design resources such as kits, development tools, partner programs, and design tools.
Mitsubishi Electric was established in Japan in 1921 and headquartered in Tokyo. The company’s Semiconductors & Devices division is a manufacturer of products serving several industries ranging from home appliances and automotive to renewable energy and optical fiber communication. The company’s products are divided into 4 product segments: power devices, high-frequency devices, optical devices, and infrared sensors. Power devices encompass motion controls, most home appliances, and SiC applications. High-frequency devices include satellite communications systems, radios, and base transceiver stations. Optical devices include projector light sources and optical fiber communication. Infrared sensing systems include MeIDIR thermal sensors.
Sansha Electric Manufacturing Co.,Ltd. was founded in 1933 and is headquartered in Osaka, Japan. Sansha produces, sells, and installs electric, semiconductor and applied, and medical machinery and equipment in Japan and internationally. Sansha provides discrete semiconductor components such as fast and soft recovery diodes, power modules, rectifier diodes, Schottky barrier diodes, SIC MOSFET, thyristors, and TRIAC components. Sansha also offers electric power regulators, general-purpose rectifiers, grid connected inverters, industrial power supplies, power supply products for evaluation and light sources, uninterrupted power sources, and welding machines.
Solid State MFG is a semiconductor manufacturer based in New Jersey. Their product portfolio includes Rectifiers, Diodes, Triacs, Diacs, and IGBT (Insulated-Gate Bipolar Transistors) as different types of semiconductors. These products provide protection for various applications such as power supply, voltage clamping, and regulating the voltage flow in small circuits along with full-wave rectification. The Diodes are used as clamping devices for the protection of electronics against spike in voltage and the SCRs (Silicon-Controlled Rectifiers) function as lamp-dimming regulators and controllers of welding machines. The IGBT has uses in trains, air conditioners, stereo systems, and electric cars.
WeEn Semiconductors Co., Ltd., established in 2015, and headquartered in Shanghai, China, is a manufacturer of bipolar power products. The company offers a diverse product portfolio, including Silicon Controlled Rectifiers utilized in power electronic circuits, Power Diodes for converting AC to DC, High Voltage Transistors for high voltage applications, Silicon Carbide Products suitable for high-temperature and high-voltage scenarios, and IGBTs and Modules commonly employed in high-power applications such as motor drives and power grids. The company has achieved certifications like IATF 16949, ISO 9001, and ISO 14001, ensuring quality and environmental standards.
ST Micro Electronics is a global semiconductor company serving customers with innovations to have a positive impact on people's lives. Their product line is micro electronic systems, such as switches, controllers, sensors and drivers. The main selling point of ST Micro Electronics is its provision of sustainable products, and introducing their electronics to create a more sustainable world. The company, as well as providing the electronic devices, also provides software and support, ensuring that all fields are covered to provide a fully provide a supported and strong relationship with their customer base. ST Micro Electronics believe that technology plays a key role in helping to solve environmental and social challenges, which is why their semiconductor technologies start with their employees, their customers and partners.
SEMIKRON Dafoss is a power electronics manufacturer formed by the 2022 combination of SEMIKRON and Danfoss Silicon Power. The goods include semiconductor components, power modules, stacks, and discrete systems, including chips, diones, and thyristors used in automotive, industrial, and renewable energy applications. Heatsinks, fans, and thermal interface materials are examples of accessories. The business operates production facilities with certifications like ISO 9001:2015, EMAS, and Letter of Conformity 2022 in Brazil, Germany, Italy, India, and the United States.
Ranking as of July 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Semikron Danfoss |
15.4%
|
| 2 | Vishay Intertechnology, Inc., |
10.7%
|
| 3 | Solid State Manufacturing |
9.8%
|
| 4 | WeEn Semiconductors Co., Ltd |
9.6%
|
| 5 | Central Semiconductor |
9.6%
|
| 6 | Mitsubishi Electric Corporation |
7.3%
|
| 7 | Littelfuse |
6.7%
|
| 8 | Littelfuse, Inc |
5.6%
|
| 9 | STMicroelectronics |
5.6%
|
| 10 | Renesas Electronics Corporation. |
5.3%
|
Derivation Method
The ranking is calculated based on the click share within the thyristor page as of July 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
4 | 33.3% |
|
Japan
|
4 | 33.3% |
|
Taiwan
|
3 | 25.0% |
|
China
|
1 | 8.3% |
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