1.5 kW unidirectional TVS for 24 V automotive rails
The 1.5KE27AHE3/51 is a 1500 W peak-pulse-power unidirectional Zener TVS from Vishay's TransZorb® series, qualified to AEC-Q101 for automotive use. Its 23.1 V reverse standoff voltage makes it a natural clamp on 24 V nominal supply rails — the 37.5 V clamping point catches load-dump and inductive-ring transients before they reach downstream silicon. The -55 to 175 °C junction range means it survives under-hood heat soak and cold-crank equally.
Housed in the DO-201AA (DO-27) axial-lead package, the 1.5KE27AHE3/51 mounts through-hole. The body diameter and lead spacing are standard for this power class — the same footprint accepts any 1.5KE-series device, so a last-minute swap to a different voltage bin requires no board spin. The bulk packaging (: Bulk) means the parts ship loose in an antistatic tube or bag — no tape-and-reel, so hand-insertion or selective-solder is the expected assembly method. For high-volume wave-solder, verify the lead clinch angle matches your fixture.
Lifecycle reality — obsolete, not a dead end
Vishay lists the 1.5KE27AHE3/51 as obsolete. No official successor order code is published on the record. The 1.5KE series is broad — a functionally equivalent 1.5KE27A (non-automotive grade) or the automotive AEC-Q101 1.5KE27AHE3 in a different packaging suffix may be available; confirm the exact BOM position before substituting. Lot traceability and RoHS compliance documentation are confirmed at quote time. No last-time-buy window remains open — the channel carries whatever surplus inventory exists.