1500W peak pulse power, 171V standoff — the clamping ceiling for a 190V rail
The 1.5SMC200A V7G: Its 171V reverse standoff voltage means the protected rail can run at up to 171V DC without the diode conducting leakage current — above that, the 190V minimum breakdown voltage triggers the clamp, and the 274V maximum clamping voltage at 5.7A peak pulse current defines the voltage spike the downstream circuitry must survive. The DO-214AB (SMC) package is a standard surface-mount footprint for this power class — reworkable with hot air if the board layout provides adequate thermal relief on the cathode tab pad.