Click the 'View Event Recording' button to view this webinar on demand!


..when is it beneficial to consider solid state technology


A metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a field-effect transistor (FET with an insulated gate) where the voltage determines the conductivity of the device.  It is used for switching or amplifying signals  It is a solid-state device that replaces a coil-activated mechanical switch with an optically isolated input stage driving a MOSFET.


It offers superior performance to an electromechanical relay in many applications.  Internally, a MOSFET relay includes an input-side LED and an output side with a photodiode dome array (PDA), a control circuit, and an output FET block. The operation is as follows:

  • The input driver circuit causes current to flow through the LED, turning it on. The driver circuit can be as simple as a pullup resistor on pin 1 and a switch to ground on pin 2.
  • The light from the LED output travels through the silicone resin and is converted to voltage by the PDA.
  • The PDA output drives the MOSFET output block via a control circuit. The output block contains a double MOSFET, allowing it to pass both AC and DC loads in either direction.


MOSFET Relay Block DiagramMOSFET Relay Construction



Compared to traditional relays, MOSFET relays offer many benefits, including lower maintenance costs, a smaller footprint, a longer lifetime (greater than 500 million operations), and higher-speed switching. MOSFET relays also outperform other electronic technologies such as thyristors, bipolar transistors, and triacs. They have hot-switching capability, are bidirectional, and support both AC and DC waveforms. Compared to solid-state relays from other manufacturers, OMRON’s G3VM relays feature single- (white) and double- (black) mold packages that give the designer the widest choice of high-sensitivity and high-dielectric-strength devices.


Omron’s G3VM MOSFET relay family includes more than 148 devices that handle a wide range of voltages and currents. Options include current limiting, high-dielectric-voltage withstand, normally open and normally closed contact forms, and high-speed switching.




Join Gabriel Sikorjak, Technical Manager Product Manager for Omron Electronic Components to discover an extensive range of switching components covering both mechanical and solid-state technology. MOSFET relays, offer features of mechanical relays and semiconductor devices, allowing you to design without compromises. The webinar will cover the exceptional capabilities of these very versatile devices and show you how to make the most of them.



In this Webinar You Will Learn How to:

  • Compare the benefits of electro-mechanical and photo-coupler technology
  • Discuss product characteristics, developments and application issues
  • Acquire design tips from reference designs;
  • Discover the comprehensive range of Omron MOSFET relays and our newest MOSFET modules.


The Presenter:



Gabriel Sikorjak, Technical Product Manager, Omron Electronic Components Europe B.V.

  • 8+ years experience in the European Product Marketing team
  • Started as PMM for sensor product range, currently dedicated to support for the MOSFET relay range
  • ManagingTechnical Competence Center (as part of Product Marketing Department): the knowledge center for existing products, aiming to create added value for customers
  • Located in Bratislava, Slovakia