The PLA143 is a 1-Form-A solid state relay which uses optically coupled MOSFET technology to provide enhanced input to output isolation of 4000V. The efficient MOSFET switches and photovoltaic die use Clare's patented OptoMOS architecture. The optically-coupled input is controlled by a highly efficient GaAIAs infrared LED. The PLA143 can be used to replace mechanical relays and offers the superior reliability associated with semiconductor devices. Because they have no moving parts, they can offer faster, bounce-free switching in a more compact surface mount or through hole package.