Standoff, breakdown, and clamping — what each voltage means
The 1.5SMC6.8AHM6G: 6.46 V minimum breakdown is the turn-on knee — once the line exceeds this, the TVS shunts current and holds the voltage down to the clamping level, protecting the circuitry downstream.
AEC-Q101 qualification and thermal margin
AEC-Q101 qualification means this part passed the automotive production-part stress tests — temperature cycling, humidity bias, and ESD human-body model — required for safety-critical and under-hood deployments. The 150°C maximum junction temperature covers the engine-bay ambient band; the DO-214AB SMC package thermal resistance determines whether the part handles repetitive transients without hitting the thermal limit — check the derating curve in the datasheet for sustained event duty.