The 1SMAF4744A with Zener Diodes SMAF RoHS is manufactured by Jingdao and is a two terminal cylindrical surface mount device used for voltage regulation, current limiting and clipping. It is constructed of a Zener diode and two resistors packaged in a small SMAF package. The package is compliant with the Restriction of Hazardous Substances (RoHS) directive, making it environmentally friendly. The two terminals are identified as the Anode, which is marked on the package with a dot, and the Cathode. It is able to withstand high temperatures for long periods of time and is capable of operation between -55°C and +125°C. It offers superior electrical and surge current protection, that can be used in automotive and avionics applications.