What this Zener TVS diode protects and where it fits
The 1N6171AUS: It clamps a 121.6 V reverse standoff rail at 218.4 V, shunting up to 6.9 A of surge current before the downstream circuitry sees the overvoltage. The SQ-MELF (C) package is a surface-mount ceramic barrel — the same footprint as a standard MELF diode but with a square cross-section for better solder-joint inspection. It operates across the -55°C to 175°C junction temperature range.
Package and mounting
At 1500 W peak pulse power, this part absorbs a 6.9 A surge. The 218.4 V clamp voltage is the ceiling the rail sees during the event — if the protected circuit's absolute-max rating sits below that, you need a lower-voltage TVS or a secondary clamp. The 152 V minimum breakdown voltage gives margin above the 121.6 V standoff — that window keeps the diode off during normal line ripple and only fires when a real transient arrives.
Active production and ordering posture
The base product number is 1N6171; the 'AUS' suffix denotes the SQ-MELF package variant. Sourced per RFQ against your BOM quantity. Current pricing and lead time confirmed at quote time — no stock-holding claim on this page.