The 1SMA5931A with Zener Diodes SMA RoHS is a surface-mounted, two-terminal diode manufactured by LGE for circuit protection purposes. The diode is designed to protect sensitive electronics when exposed to overvoltage conditions. It has a Zener voltage breakdown of 5.9V, a surge current rating of 500mA, and a surge dissipation of 300mW. The diode is small and space-saving, so it can be soldered to printed circuit boards and integrated into a range of electronic products. It is RoHS compliant, meaning it uses less hazardous, greener materials to manufacture.