This section provides an overview for mosfet output as well as their applications and principles. Also, please take a look at the list of 9 mosfet output manufacturers and their company rankings. Here are the top-ranked mosfet output companies as of October, 2023: 1.Refurvo LLC, 2.Cosmo Electronics Corporation.
MOSFET Output relays are equipped with an LED, a light receiving element, and a MOSFE inside, and operate in the same way as conventional relay components using a combination of these elements.
Conventional mechanical relays were controlled ON/OFF by passing an electric current through a built-in coil and operating an electrical contact point by the magnetic force of the coil. In contrast, MOSFET Output relays emit light by passing a current through a built-in LED, which uses the light to generate an electromotive force in a photodetector. The MOSFET is operated by that electromotive voltage, enabling control similar to that of a conventional relay.
Similar photo MOSFET Output relays include photocouplers, phototransistors, phototriacs, and SSRs (Solid State Relay). These are collectively referred to as contactless relays or semiconductor relays, and are used differently depending on the application.
MOSFET Output relays are often used in circuits that require a large current, or in phototriacs and SSRs that are good at turning alternating current on and off, rather than in photocouplers, phototransistors, and other applications.
MOSFET Output relays use light to transmit signals from the primary side to the secondary side, and since the primary and secondary sides are completely isolated electrically, they are driven by commercial power supplies or high voltage power supplies with small signals, such as microcontroller circuits. Therefore, they are used in circuits that turn on and off relatively large power loads of several A or so, and in bridging circuits such as motor drivers.
When a signal current is applied to the input terminal, an LED emits light and the light-receiving element receives the light, generating an electromotive voltage. This voltage causes the gate voltage of the MOSFET to rise and the state between the source and drain of the two MOSFETs turns ON.
Then, current can flow through the source-drain of the MOSFET on the side with the higher voltage opposite the voltage between the output terminals, and through the parasitic diode of the MOSFET in the next stage. As a result, current can flow between the output terminals regardless of the electrical polarity between them.
A photo MOS relay consists of three elements: an LED, a light-receiving element such as a photodiode, and a MOSFET Output.
The MOSFETs feature a structure in which two circuits are arranged in opposite directions, each connected by a parasitic diode.
For example, when trying to make a motor driver, it is common to construct a circuit using a full-bridge circuit. However, the biggest concern with this circuit is that when the power supply voltage is applied to both ends of the load as it is, the source voltage of the upper FET among the upper and lower FETs becomes equal to the power supply voltage. To turn on the upper FET from this state, it is necessary to prepare a separate voltage higher than the supply voltage and use that voltage to control the gate voltage of the upper FET.
However, since the MOSFET Output can operate as long as the built-in LED is lit, it can be directly driven by a signal of a few volts output from the CPU. It is also possible to completely isolate the power supply for the motor drive from the power supply for the control.
There are two types of MOSFETs: the type that is always OFF and the type that is always ON. The former can be used as make-contact relays and the latter as break-contact relays.
MOSFET Output relays can also be used as AC current switches by connecting two MOSFET sources facing each other. The conduction characteristics of photo MOSFETs are independent of the amount of input current, so that current ON/OFF control is possible even with minute input currents.
*Including some distributors, etc.
Sort by Features
Sort by Area
Refurvo, LLC is an American IT equipment and services supplier that was originally formed as a consulting company in 2016 in San Jose, California. The company offers various specialized electrical components including semiconductor and reed relays, filters, radio frequency microelectromechanical systems (RF MEMS) switches, and electromagnetic shielding materials. Refurvo also offers IP inventory and assets analysis, market research, product customization, and project based consultation services. The company primarily serves clients in the semiconductor, automotive, and telecom industries.
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.
Panasonic Industry, Founded in 1918, is an enabler that provides customer with unique strength through their material and process technologies. Panasonic Industry wants to make social demands strong and help in solving problems associated with such demands. Panasonic Industry manufactures numerous products such as capacitors, relays, connectors, sensors, etc. Such products are used in automobiles, solution modules, home appliances, health care, and other equipment. Their aim is to improve society and make it richer via new methodologies and technologies.
Toshiba Electronic Devices & Storage Corporation is a division of Toshiba focusing on providing designs for end-product developers as well as semiconductor and drive equipment for automotive, industrial equipment, green energy, and consumer and personal electronic devices. Toshiba’s storage products include cloud-scale and enterprise-level products, and PC hard drives. Semiconductor products include Si Cower devices, MOSFETs, IGBTs, IEGTs, isolators, solid state relays, power management and intelligent power ICs, diodes, bipolar transistors, microcontrollers, automotive devices, ICs for wireless communication equipment, general purpose logic ICs, radio-frequency devices, sensors, and linear image sensors.
Panasonic Industry Europe is the European branch of Panasonic, a global manufacturer of electronics and houseware, originally founded in 1918. Panasonic Industry Europe manufactures in 4 categories: components, devices, energy & building, and automation devices & solutions. Components include relays, capacitors, resistors, sensors, switches, connectors, couplers. Devices include wireless connectivity, e-bike systems, motors, compressors, thermal solutions, GPS antennas, as well as electronic materials. Energy & building includes batteries, fuel cells, solar sells, power tools, and home IoT. Automation devices & solutions include sensors for factory automation, industrial motors, laser welding, and more.
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.
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.
OMRON Electronic Components Europe is the European division of OMRON Corporation, which is based in Kyoto, Japan, and has head offices around the world. The European division has its own development and manufacturing facilities providing local customer support provided in all European countries. The European division produces PCBs and other components for the eSports, alternative energy, automated test equipment, and entertainment industries. The company’s four primary product divisions are relays, switches, connectors, and sensors including flow sensors and IoT sensors.