Its 45V reverse standoff voltage means it stays off the DC bus under normal operation, only conducting when the line exceeds 50V breakdown minimum. The 80.3V clamping maximum at 7.5A peak pulse sets the voltage the downstream circuitry must survive during a 10/1000 µs surge event. The bidirectional configuration protects both polarities with a single device, saving board space on AC-coupled or bipolar lines.
Package and temperature range for the board
The base product number SMBJ45 is shared across the family, so confirm the suffix for the bidirectional C-suffix and lead-free finish.