1500W Zener TVS in SQ-MELF — 1N6167AUS
It clamps transients at 151.3V max with a 9.9A peak pulse current, and its 104.5V minimum breakdown voltage makes it a fit for 86.6V reverse standoff rails — typical in 72V or 96V DC bus protection on telecom or industrial power supplies.
The 104.5V min breakdown and 151.3V max clamping at 9.9A Ipp give a 45% clamping ratio above standoff — typical for a Zener TVS. The 86.6V reverse standoff leaves headroom for a nominal 72V rail with 20% tolerance, so the diode stays off during normal operation and only conducts during a surge.
Microchip lists the 1N6167AUS as Active. The SQ-MELF package is a standard surface-mount hermetic package — store the reels dry, but the ceramic body handles soldering reflow without moisture sensitivity level concerns typical of plastic packages.
The 1500W peak pulse rating is derated linearly above 25°C — at 175°C the derating factor drops to zero, so keep the average junction temperature below 150°C in repetitive surge applications.