The BZT52C5V6 is a zener diode in a SOD-123 package, manufactured by FuxinSemi. It is a bi-directional unidirectional voltage regulator that helps protect circuits from over-voltage and reverse-voltage conditions. It features a maximum Zener voltage of 5.6V and a maximum reverse leakage current of 20uA. It is RoHS compliant, meaning that it does not contain any harmful substances such as lead, mercury, cadmium, hexavalent chromium, and polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs).