DO-214AB TVS for 40V automotive rails
The 1.5SMC47AHE3/9AT: It clamps at 64.8V max when hit with a 23.1A surge, protecting downstream electronics on 40.2V nominal rails. DO-214AB (SMC) surface-mount package — standard footprint for automated pick-and-place, mates with the same land pattern as the supplier device package DO-214AB (SMCJ).
AEC-Q101 and the TransZorb clamping window
AEC-Q101 qualification means this part passes automotive-grade reliability stress: temperature cycling, high-temperature reverse bias, and ESD immunity per the automotive discrete semiconductor standard. The breakdown voltage window (44.7V min) sits 4.5V above the 40.2V standoff — this 11% margin ensures the TVS doesn't conduct during normal 40V rail ripple while still clamping fast on a transient. Power line protection is not specified (no), so it's designed for signal or low-impedance DC bus clamping, not AC mains.
Lifecycle status is active — Vishay continues to manufacture this part.