The MM1Z3V9 with SOD-123 Zener Diodes is a surface mount electronic component from EIC Semiconductor. It is a voltage regulator, with a Zener diode as its key component, that helps to maintain a constant voltage level within an electrical system. This component is made of a semiconductor material and is RoHS compliant, meaning that it does not contain lead or other hazardous substances. It has a 3.0V zener voltage rating, and is available in 2.7%. It can be used in a wide variety of applications, such as voltage regulation, overvoltage protection, ESD protection, and voltage clamping.