The 1SMAF4758A device with Zener Diodes SMAF is manufactured by Jingdao. It is a RoHS compliant device that is made for a wide variety of applications, including automotive, industrial, and consumer electronics. This device is specifically designed to prevent against surges, spikes, and over-voltages in a circuit. It provides up to 575V of protection using a pair of Zener Diodes to actively clamp the voltage at a safe level. This device also provides advanced thermal management, allowing it to work reliably and safely within a wide temperature range. This device meets the international standards for reliability and durability, making it a perfect choice for many applications.