1500W TVS on a 12V rail — AEC-Q101 qualified
The 1.5SMBJ12A: It clamps at 19.9V max, handles 75.4A peak pulse current, and is qualified to AEC-Q101 — the automotive discrete stress and reliability standard. That qualification means it passes the full suite of temperature cycling, ESD, and humidity tests required for under-hood or chassis-mounted electronics.
12V standoff, 13.3V breakdown — the trigger window
Reverse standoff voltage is 12V, so it sits across a 12V rail without conducting in normal operation. Breakdown starts at 13.3V min — the TVS begins shunting current once the transient pushes above that threshold. The clamping voltage of 19.9V max defines the peak voltage the protected circuit sees at full rated current. The DO-214AA (SMB) package is a standard surface-mount footprint — reflow profiles for the SMB body are well documented, and the package supports the 1500W pulse rating without exceeding the junction limit.
Bourns lists the 1.5SMBJ12A as Active. For a production BOM that already qualifies this part, the supply risk is low — it remains a standard catalog item in the 1.5SMBJ series.