AEC-Q101 qualification — what it means for the BOM
The 1.5SMC33CAHE3/9AT carries AEC-Q101 automotive qualification, meaning it is certified for the reliability stress tests, temperature cycling, and PPAP documentation an OEM auditor expects. Capable is not qualified — this part has the paperwork. A grade-0 equivalent thermal envelope for the junction, not just the ambient.
Parametric fit — clamping, standoff, and surge rating
For a 24V automotive battery line, this sits above the nominal 24V and below the 31.4V minimum breakdown voltage, so the part stays off during normal operation. The clamping voltage must stay below the abs-max rating of the protected IC. 1500W peak pulse power is the energy rating for a 10/1000 µs surge. For shorter transients (e.g., 8/20 µs), the peak current capability is higher — the datasheet's pulse-derating curve governs the real-world margin.
DO-214AB (SMC) surface-mount package with a standard footprint for 1500W TVS diodes. The supplier device package is DO-214AB (SMCJ). The copper pad area under the cathode tab sets the thermal resistance — a larger pad improves surge capability by lowering RthJA. Bidirectional construction means a single device clamps transients of either polarity, making it suitable for AC-coupled lines or signal pairs where the polarity is not fixed.
Part of the Automotive, AEC-Q101, 1.5SMC, TransZorb series from Vishay General Semiconductor. No stock-holding claim — confirmed per RFQ.