1500 W peak pulse, 31.6 V standoff — the clamp voltage is 56.4 V at 26.6 A
The 1.5KE39CHE3/54: Its 31.6 V reverse standoff voltage protects a 28 V or 32 V nominal rail, clamping at 56.4 V when the 10/1000 µs peak pulse current hits 26.6 A. The breakdown voltage window starts at 35.1 V minimum, so the part triggers before the rail exceeds the downstream device's absolute maximum — this is the margin the design-in engineer budgets against load-dump or inductive kickback.
AEC-Q101 and the full -55 to 175 °C junction range
AEC-Q101 Grade 0 qualification means the 1.5KE39CHE3/54 is screened for -55 to +175 °C junction temperature — the full under-hood automotive band. The 1500 W peak pulse rating is derated above 25 °C per the datasheet curve; at 175 °C the derated capability is roughly 25% of the 25 °C figure. The DO-201AA (DO-27) axial-lead package is a through-hole form factor. The lead spacing and body diameter match the standard 1.5KE footprint — the same PCB land pattern serves the whole 1.5KE family, so a last-minute BOM swap between voltage variants does not require a board spin.
Obsolete — no official successor on record
Vishay lists the 1.5KE39CHE3/54 as obsolete. No direct pin-compatible successor order code is published in the lifecycle record. Sourcing runs through independent distribution; quantities and date codes are confirmed at RFQ. For a new design, a current-production 1.5KE series TVS with the same 31.6 V standoff and DO-201AA package is the functional replacement path — confirm the AEC-Q101 grade and the exact breakdown window against the BOM's protection threshold.