The MM1Z20B with SOD-123 package is a Zener Diode, manufactured by EIC Semiconductor. It is compliant with the ROHS standard, which indicates that the product does not contain any hazardous substances. It is designed to provide a stable voltage reference, helping to regulate a circuit's voltage. It has a voltage range of 3.3V to 75V. The package is SOD-123, which is a surface-mount design, allowing for easy integration into smaller circuit designs. The device is rated for low-power dissipation, allowing it to be used in battery-powered systems without compromising the battery life. The part is designed to meet modern EMI and ESD requirements, providing a reliable and durable solution.