SMBJ54A-E3/52 is a Transient Voltage Suppressor Diode manufactured by Vishay. It has a unidirectional structure and is designed to protect sensitive electronic components from voltage transients induced by Lightning, inductive load switching, and other transient voltage events. The device is rated to 54V with a peak pulse power of 5.2kW, and reverse leakage current of 200nA at 5.0V. The device is packaged in a SOD-123 package.