An OptoMOS is a semiconductor device with a LED as an input and MOSFET as an output. It is used in various fields to improve device reliability and reduce size.
Obviously the OptoMOS are different to the conventional electromechanical relays. OptoMOS are classified as semiconductor devices that have no moving contacts, therefore they are superior to conventional electromechanical relays in life expectancy and reliability of contacts, operation speed, and their sizes. But they also distinguish themselves from other switching solutions that utilize photo-couplers, photo-transistors etc. OptoMOS have MOSFET for output, therefore they are the most suitable devices for small analog signal switching.