This electronic part is a Zener diode manufactured by Panjit. It is a LL-34 RoHS (Restriction of Hazardous Substances) component. It has a ZMM5251B_R1_10001 marking and offers a power rating of 100 mW. This diode is designed for use as a voltage-regulating device in a wide range of applications, such as television sets, computers, audio equipment, and more. It is also suitable for providing protection against fluctuations in voltage, and can be used in power supplies and other electric circuits. It is RoHS compliant, which means it is free from dangerous levels of hazardous substances such as lead, mercury, cadmium, and hexavalent chromium.