1500 W peak pulse — what the rating buys you
The 1.5SMC250A: That 130 V margin between standoff and clamp means the TVS absorbs the surge before the downstream silicon sees breakdown — critical for 240 VAC secondary-side or 200 VDC bus protection where the steady-state rail is already near the component voltage rating.
Breakdown and standoff — guard band for the rail
Minimum breakdown voltage is 237 V, tested at the specified reverse current. The 214 V reverse standoff is the maximum DC or peak AC voltage the diode blocks without conducting — design the protected rail at or below 214 V to keep leakage negligible during normal operation.
Package and board fit
DO-214AB (SMC) surface-mount package, the same footprint as the industry-standard SMC body. Supplied on Tape & Reel or Cut Tape — the reel quantity suits automated pick-and-place for medium-to-high volume builds; Cut Tape works for prototype or low-volume rework.