The ZMM5256B_R1_10001 is a Zener Diode with MINI-MELF RoHS certification, manufactured by Panjit. It is constructed of two semiconductor layers of the same type, and is designed to allow current to travel in one direction but not in the other. It is designed to breakdown when the voltage exceeds its breakdown voltage and regulate voltage in the circuit with its reverse breakdown voltage. The ZMM5256B_R1_10001 is RoHS certified, meaning it is compliant with the Restriction of Hazardous Substances Directive of the European Union. This means that the product does not contain lead, cadmium, mercury, hexavalent chromium or polybrominated biphenyls.