The 1.5SMC6.8CAHE3/9AT is a bidirectional transient voltage suppressor — the CA suffix confirms it clamps both polarities, which matters in automotive environments where harness inductance flips polarity on inductive load dump events. That is the design target for ECU input protection on unswitched rails. The breakdown minimum of 6.45V sits close enough above the 5.8V standoff that the TVS stays invisible on a 5V rail under normal conditions, then turns hard on and clamps the spike before it reaches the protected node. The ±5% tolerance band is tight enough to make this prediction reliable across production.
AEC-Q101 qualification and the under-hood temperature envelope
AEC-Q101 is the automotive discrete-semiconductor stress qualification — it means the part passed temperature cycling, humidity bias, and peak pulse current life testing at the grades a Tier-1 supplier requires before an ECU goes into a production vehicle.
DO-214AB SMC package — automotive TVS footprint
The DO-214AB SMC is the dominant automotive TVS package — it tolerates the reflow profiles used in ECU board assembly and the thermal cycling that follows in field service. Surface-mount termination supports automated placement at the speeds production lines run.
Availability and current pricing confirmed at RFQ; no stock-holding claim is made here for an independent-channel part.