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.
Clamping voltage and breakdown margin
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.
Active production — no LTB pressure
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.
Rated for -55°C to 175°C junction temperature, this part suits outdoor telecom cabinets, avionics, and downhole instrumentation where ambient heat or cold-soak extremes are routine. 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.