What the 1500W rating means for your rail
The 1.5KE9.1A-TP: For a 7.78V nominal rail, the 13.4V clamping voltage (max at 113.4A peak pulse current) means the protected circuitry sees no more than 13.4V across the transient, which is the ceiling for downstream 12V-rated silicon. The 8.65V minimum breakdown voltage ensures the diode does not conduct during normal rail operation at 7.78V, but triggers before the rail rises above the downstream device's abs-max rating. The 1.5 kW pulse rating is the standard 10/1000µs double-exponential waveform per IEC 61000-4-5 — a telecom or automotive transient that lasts a few milliseconds, not repetitive AC line surges.
Automotive temperature range and deployment
The wide temperature range also suits telecom outdoor cabinets where ambient can hit 85°C and the junction sees additional self-heating during a surge.
No pin-compatible second source or official cross-reference is listed in the manufacturer's documentation for this order code. The base product number 1.5KE9.1 covers the same die and package but with different suffix options for packaging (tape vs bulk) — the -TP suffix indicates bulk packaging per the Micro Commercial Co naming convention.