1.5 kW surge clamp in a DO-214AB footprint
The 1.5SMC200A R7G: The 190 V minimum breakdown voltage gives a guard band above the 171 V standoff, so the part stays transparent during normal line conditions and only conducts when a surge pushes past that threshold.
What the clamping voltage means for your rail
The 274 V clamp at 5.7 A is the voltage the TVS forces the surge down to — any component on that rail must have an absolute maximum rating above 274 V to survive a 1500 W strike. The 5.7 A peak pulse current is the surge current the device can sink at the clamp voltage — multiply the two to confirm the 1500 W rating holds for your waveform.
Board fit and temperature envelope
The DO-214AB (SMC) package is a standard surface-mount footprint for TVS diodes in this power class — the same pad layout used by the SMCJ and 1.5KE families, so a board already tooled for those will take this part without a layout change.