The 1.5KE6.8CAHE3_A/C is a 1500 W bidirectional TransZorb® TVS from Vishay, qualified to AEC-Q101 for automotive use. The DO-201AA (DO-27) axial-lead package is a through-hole form factor that stands up to repeated pulse stress — the lead bonds and die attach are sized for the 1500 W rating, not just the steady-state dissipation.
Reverse standoff voltage is 5.8 V — the TVS draws negligible leakage below this level, so a 5 V logic rail or a 12 V battery line (with the TVS on the low-side sense) stays undisturbed during normal operation. Breakdown starts at 6.45 V minimum, and clamping is guaranteed at 10.5 V maximum with the full 143 A pulse applied. That matters on an automotive bus where a reverse-battery event or a negative load-dump can hit the same node.
The AEC-Q101 qualification (Automotive, TransZorb® series) means the device has passed the full suite of automotive stress tests: high-temperature reverse bias, temperature cycling, and ESD robustness per the AEC-Q101 rev D standard. For a repair bench or a production line, that traceability reduces the risk of a counterfeit or a sub-spec part ending up in a safety-critical circuit.