In summary, when considering an application and trying to identify the best Photo-MOSFET Solid State Relays to use, there are several important parameters that will allow users to narrow their search. Identifying the required load voltage and current, the allowable On state resistance and capacitance, the desired Input-to-Output Isolation, the required switching speed and allowable off state leakage current, will all point to the part that best fits an application’s needs.