The SD103AX is a Schottky Barrier Diode (SBD) manufactured by Doeshare and is compliant with the ROHS standard. It has a single 350mA rating with a 0.6V dropout voltage at 200mA. A maximum voltage rating of 40V and a 5uA current rating at 30V are also stated. This diode is part of the SOD-523 package.