- on Power Supplies
- Published in issue 7/2009 on page 42
SSR 2.0, OptoMOS semiconductor relays
A typical modern optoMOS relay has an LED at the input as in the a normal optocoupler, but the light is used to switch two complementary photo MOSFETs which form a bidirectional switch. This bidirectional configuration is capable of switching both AC and DC supplies at speeds of around 1 ms. Most of the major IC manufacturers produce their own versions and amongst those stocked by one supplier include NEC (PS7141-2B), International Rectifier (PVN012APbF), Clare (LBB110) and Vishay Semiconductors (LH1502BB).