500 W peak pulse power, 100 V standoff — what it protects
That 500 W rating means it can clamp a 2.8 A surge to 179 V max before the junction gives up — useful for protecting 100 V DC rails or signal lines from transients like inductive kickback or lightning-coupled spikes. It is a single bidirectional channel device, so it clamps both positive and negative overvoltages on the same line — no need for two diodes back-to-back.
Package and mounting — DO-214AC (SMA) footprint
The SMA footprint is a standard two-pad layout with a cathode band; the copper pad area under the device directly influences thermal resistance during a surge event.