The MM1Z30B is a Zener diode manufactured by Jingdao and is compliant with RoHS requirements. It is housed in a SOD-123 package. It has a maximum power dissipation of 500mW, a maximum reverse voltage of 30V, and a maximum zener current of 78mA. It also has a maximum forward voltage of 1.2V. The device can be used for regulating, clipping, and clamping circuits, voltage references, and overvoltage protection.