Clamping window — what the standoff and breakdown voltages mean for the protected rail
The 1.5SMC9.1CAHE3_A/H: The reverse standoff of 7.78 V typ sets the maximum working voltage the protected rail sees during normal operation — the TVS stays reverse-biased and off until a surge arrives.
Automotive qualification — AEC-Q101 and the under-hood thermal envelope
AEC-Q101 is the automotive discrete semiconductor stress qualification — it certifies the part has passed temperature cycling, humidity bias, power cycling, and surge-life testing at the grade 1 temperature band (-40 to +125 °C ambient). For a TVS protecting an ECU input or a sensor rail, this means the clamping path itself is rated for the thermal profile of a sealed engine-compartment module without derating to a lower current grade. Junction temperature range is -65 to +150 °C — the upper limit gives headroom above the 125 °C grade 1 ceiling, so a 105 °C under-hood ambient still leaves 45 °C of junction rise margin at typical surge duty.
Sourcing posture — active, no successor on record
Available through independent distribution and quoted to order against BOM quantity with full lot traceability and manufacturer warranty from an authorized source.