TransZorb® TVS, 1500W, Bidirectional
The 1.5KE9.1CA-E3/1: It clamps transients at 13.4V maximum while conducting 112A peak pulse current, making it a fit for protecting 7.78V nominal rails in general-purpose DC power and signal lines. Packaged in the DO-201AA (DO-27) axial-lead form factor, it is a through-hole part suited for point-of-entry suppression on a PCB or terminal block — the axial body sits above the board, which matters for layout clearance in crowded enclosures.
Clamping Profile and Operating Envelope
The breakdown voltage range starts at 8.65V minimum, with a reverse standoff of 7.78V typical — the rail must stay below this standoff to avoid leakage during normal operation. The 13.4V clamping ceiling limits the voltage spike seen by the downstream silicon, which for a 5V or 3.3V logic rail would still require a secondary clamp or a lower-voltage TVS in series. The 1500W rating is derated above 25°C per the standard pulse derating curve — at 175°C the peak power capability drops to approximately 25% of the 25°C value.
Vishay lists the 1.5KE9.1CA-/1 as obsolete. No official successor order code is recorded on the lifecycle notice — the 1.5KE series has been superseded by newer TransZorb families, but a direct pin-compatible replacement from Vishay is not documented in this record. For a BOM line that calls out this exact part number, the supply channel is independent distribution holding end-of-life inventory.