What this 1500W bidirectional TVS covers
The 1.5KE7.5C-E3/54: The reverse standoff voltage is 6.05 V, with a breakdown window starting at 6.75 V minimum, so it sits on a 5 V or 6 V rail without conducting in normal operation but fires before the rail exceeds the downstream device's abs-max rating.
Through-hole axial DO-201AA (DO-27) body — the leads are formed for through-hole insertion, not surface mount. The 1.5KE package footprint is standard across the series, so the board layout is shared with other voltage variants in the same power class.
Lifecycle reality — obsolete and sourced through surplus
Available through independent surplus and broker channels. Sealed reels with consistent date-codes are the preferred lot condition; mixed-date or repackaged stock should be inspected before committing to a BOM line.