The MM1Z27 with Zener Diodes SOD-123 RoHS is a surface mount diode, manufactured by Jingdao. It is a zener diode, meaning that it is designed to break down under a specific voltage, and provide a regulated voltage over a wide range of currents. This diode is housed in a small SOD-123 package, and is compliant with the RoHS standards, meaning it uses lead-free materials. It can withstand a maximum power dissipation of 500mW, and has a maximum reverse voltage of 33V. It is designed for use in circuits that need a regulated voltage and can be used for power supplies, voltage regulators, and other switching applications.