1500 W peak pulse, AEC-Q101 qualified
The 1.5SMBJ51CA: The -55°C to 150°C junction temperature range covers the full automotive thermal profile.
Clamping and breakdown — the protection window
Reverse standoff voltage is 51 V; the device starts conducting at 56.7 V minimum breakdown and clamps the transient to 82.4 V maximum at the rated 18.2 A peak pulse current. This 56.7 V to 82.4 V window means the protected rail sees no more than 82.4 V during a surge — well within the typical 100 V abs-max of downstream 48 V to 60 V-rated DC-DC converters and sensors.
DO-214AA (SMB) — board-fit note
The 1.5SMBJ51CA comes in the DO-214AA (SMB) package, a standard surface-mount footprint shared across the 1.5SMBJ family. The SMB body is larger than the SMA variant, which helps dissipate the 1500 W pulse without exceeding the junction temperature limit. The tape-and-reel packaging suits automated pick-and-place assembly.