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The MMSZ4700T1G is a surface mount Zener diode manufactured by ON Semiconductor. It has a voltage rating of 47 V and a power rating of 500 mW. This component is used to regulate voltage levels by clamping them to a set level. It has a small and low profile SOD-123 package, making it suitable for use in portable or small designs. The Zener diode has noise immunity, low leakage current, low pipk-to-peak noise, and high linearity capabilities, making it suitable for applications such as USB protection, battery crowbar protection, and LED lighting.