Transient protection for harsh environments
Its 500 W peak pulse power rating (10/1000 µs waveform) and 12.2 V reverse standoff voltage make it a fit for 12 V nominal rails where a surge event must be shunted before the downstream circuitry sees overvoltage.
Breakdown voltage is guaranteed at 14.44 V minimum, with a maximum clamping voltage of 23.42 V at the peak pulse current of 21.28 A. The 8.98 V spread between breakdown and clamp means the designer must verify that the protected load's absolute maximum rating stays above the clamp ceiling under worst-case surge. Because it is bidirectional, a single device protects AC-coupled lines or bipolar signal pairs without needing two series diodes.
Microchip lists the 1N6111US as Active. For a BOM line that must remain stable across a multi-year production run, this part does not carry a looming LTB deadline. The SQ-MELF package is a surface-mount ceramic barrel with solderable end caps.