The FOSAN 1SMA4734A is a SMA-type Transient Voltage Suppressor (TVS) designed to protect sensitive electronics from voltage transients. The protection is provided by diverting surge current away from the protected component. This device is compliant with the Restriction of Hazardous Substances (RoHS) Directive, meaning that all covered components do not contain any hazardous substances, such as lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBBs), or polybrominated diphenyl ethers (PBDEs).