Automotive-grade transient suppression
The SMBJ45CAQ-13-F: It clamps transients at 72.7 V maximum and handles 8.3 A peak pulse current, making it a fit for protecting 45 V nominal rails in automotive electronics. The -55°C to +150°C junction temperature range covers under-hood and cabin environments without derating concerns.
Clamping parameters and fit
With a 45 V reverse standoff voltage and a minimum breakdown voltage of 50 V, the SMBJ45CAQ-13-F stays transparent below the rail and starts conducting only when the transient exceeds the breakdown threshold. The 72.7 V clamping voltage sets the peak voltage the downstream circuitry sees during a surge event. The DO-214AA (SMB) package is a common footprint; rework is straightforward with standard hot-air tools, and the package outline is clearly marked for orientation.
The part is orderable under the listed order code; confirm the BOM position count and the mating half before committing.