The 1SMA5916A is a single 0.5 watt (Pd) 4.3V zener diode with a low dynamic impedance of 6 ohms. It is manufactured by DOWO according to JEDEC standard SMA package, and comes with a maximum current rating of 5uA@1V. It is RoHS compliant, meaning it meets particular environmental regulations for hazardous substances. This component is typically used for clamping, voltage regulation, and other general purpose applications.