The SA45A with 72.7V 50V 45V Plugin TVS ROHS is an electrostatic discharge protection device manufactured by Yageo. It is designed to safeguard electronic components and parts from damage due to static electricity or other similar high voltage surges. The device is RoHS compliant, meaning that it does not contain any hazardous substances such as lead or mercury. It is capable of handling 72.7V peak pulse power at an 8/20 microseconds pulse width. The device's voltage rating of 50V and 45V allows them to withstand voltage surges up to these levels, thus protecting the attached equipment. This device is widely used for protecting computers, communications devices, automobile systems and other electronic devices.