:The 1N5819WS S4 is a RoHS compliant Schottky Barrier Diode (SBD) manufactured by JSMSEMI. It has a single 350mA forward current rating, with a voltage drop of 600mV at 200mA. Its operating reverse voltage ranges from 30V to 40V, and it has a reverse current burst of 5uA at its maximum operating voltage. This diode is encased in a SOD-323 surface mount case for easy installation in most electronics applications.