Surge rating and voltage thresholds
The 1N6157AUS is a bidirectional Zener TVS diode rated for 1500W (1.5kW) peak pulse power under the 10/1000 µs waveform. Minimum breakdown voltage is 40.9V, and clamping is held to 59.1V maximum at the peak pulse current of 25.4A. The reverse standoff voltage is 32.7V typical — the device does not conduct below this level, so it sits transparently on a 28V or 32V rail.
Package and thermal environment
Surface-mount SQ-MELF (C) package — the cylindrical body matches the MELF footprint common in high-reliability and military assemblies.