AEC-Q101 Zener TVS for 12V automotive rails
The 1.5SMC12AHE3/9AT: It protects a 12V nominal supply rail: the reverse standoff voltage is 10.2V, so the device stays in high-impedance below that level and does not leak appreciably on a healthy 10.2V line.
Automotive temperature grade and package
The operating junction temperature range spans -65°C to 150°C, covering cold-crank and under-hood ambient extremes. No power line protection (the device is unidirectional, so it clamps only positive transients above the breakdown voltage; negative surges forward-bias the Zener junction). Mounting is surface-mount on a standard SMC footprint — the 0.30 mm lead pitch and JEDEC outline match automated pick-and-place.
Active production and sourcing posture
No official second-source or pin-compatible alternative is listed in this series for the same AEC-Q101 qualification.