1500 W pulse — what the clamping voltage means for rail protection
The 1.5SMC150CA M6G: The reverse standoff voltage of 128 V means the TVS draws negligible leakage below that rail voltage — it sits across a 128 V DC bus or a 90 V AC RMS line without conducting. The minimum breakdown voltage of 143 V gives a 15 V guard band above the standoff, ensuring the zener avalanche triggers before the protected circuitry sees damaging overvoltage.
Bidirectional single channel — one DO-214AB package for AC or bipolar rails
A single bidirectional channel clamps both polarities symmetrically, which suits AC signal lines, bipolar power rails, or DC buses where reverse-voltage events are possible.
General-purpose application — no power-line rating
The part is classified for General Purpose applications and is explicitly marked as not providing power line protection. This means it is intended for secondary-side DC rails, signal lines, or low-voltage equipment inputs — not for mains AC input protection where a higher-energy MOV or gas tube would be required. The 1500 W rating is a peak pulse rating, not continuous power; the device assumes the surge event is short enough that the junction does not exceed the 150°C limit.