:The 1SMAF4742A is a zener diode manufactured by Jingdao that complies with RoHS (Restriction of Hazardous Substances) standards. It is a surface-mount diode designed for use as a voltage regulator or as a protection device against overvoltage transients and voltage spikes. It is also built to provide superior electrical isolation, temperature stability, and long-term reliability when used in suitably designed circuits. The features of the 1SMAF4742A include a 4.7V zener voltage, a 2.0A continuous forward current rating, and an 18mW power dissipation. The 1SMAF4742A has a lead-free, halogen-free ceramic construction that makes it suitable for reliable use in a variety of signalling applications.