What the 1500W rating means on the bench
The SMCJ130CA-13: For a 130V line, the reverse standoff voltage (130V) is the normal operating rail; the part stays out of the way until a transient pushes past the 144V minimum breakdown threshold. When it fires, clamping happens at 209V maximum at the rated 7.2A peak pulse current. That 209V ceiling is what the downstream silicon sees — if the protected device's abs-max rating sits below that, the TVS won't save it. The 1500W rating is the headline number, but the clamping voltage at the actual surge current is the one that decides fit.
Package, footprint, and temperature range
That matters on AC lines or floating DC rails where the polarity isn't fixed.
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