:The SMBJ78A is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode manufactured by GoodWork. It is of the DO-214AA (SMB type) package form factor and is designed to protect sensitive electronics from transient surges and high-voltage electrical discharges. It features a Peak Pulse Power rating of 4.7 Amperes, Standoff Voltage of 5uA, and Breakdown Voltage ratings of 126V, 86.7V, 78V, and 99.7V with a Response Time of 10uS. It is RoHS compliant, and is usually used to protect voltage sensitive components such as memories, ports, and other electronics from electrostatic discharge (ESD), voltage transients, and other fast-changing electrical currents.