The EL817S1(A)(TU)-F with Optocouplers SMD-4 RoHS is a surface mount sop-4 optocoupler chip manufactured by Everlight. It features low input current, high common mode noise immunity, and wide operating temperature range of -55? to 105?. It has an optically isolated input to output isolation voltage of 5300 Vrms for 1 minute. The EL817S1(A)(TU)-F complies with the European Union's RoHS directive, which means that it is free from hazardous substances like lead, cadmium, mercury, and chromium. It is available with either a standard or tube package, and can be used in a variety of applications, including signal transmission, interfacing isolated components, and circuit isolation.