The 1SMA4755A with Zener Diodes SMA RoHS by Jingdao is an electronic part used to regulate voltage in a circuit. It is a two-terminal, surface-mount component featuring a high-voltage, high-current, and low-temperature base-diffused Zener diode with an SMA package. The package is RoHS compliant and features an ultra-small surface-mount package. The 1SMA4755A can withstand up to 475 volts of reverse voltage and delivers up to 5 watts of power. It is designed to regulate voltage, provide protection against voltage transients and over-voltage fault conditions, and provide a reference voltage in a variety of circuit applications.