4532-401-LF-(SZZY) with Discharge Tubes (GDT/TSS) SMD RoHS is an electronic part manufactured by Yageo. It is a Surface Mount Device (SMD), which is designed to be mounted on the circuit board and does not require a through-hole. The part is constructed using a Glass Dielectric Tube (GDT) and a Transient Suppression System (TSS), which protect the circuit from overvoltage, overcurrent, and ESD. The RoHS certification indicates that the part is compliant with the Restriction of Hazardous Substances (RoHS) Directive, which restricts the use of certain hazardous materials in the manufacture of electrical and electronic equipment. The “LF” suffix indicates that the part is lead-free, meaning it does not contain lead as a material component.