Browse over 10,000 Electronics Projects

App note: Solid-State Relays

App note: Solid-State Relays

Solid-state relays introduction from Vishay, Link here (PDF)


MOSFET SSRs feature an optocoupler construction, but have a pair of MOSFETs on the output instead of a phototransistor. A pair of source-coupled MOSFETs emulate an electromechanical relay by providing bidirectional switch capability and a linear contact. No output power supply is required.