Active Zener TVS for 11.4V rail clamping
The 1N6110AUS/TR: Clamping is specified at 21V max at 23.8A peak pulse current. This is a single bidirectional channel device — it clamps both polarities equally, which simplifies layout when the protected line swings above and below ground. The SQ-MELF B package (surface-mount) is a hermetic ceramic body — no moisture sensitivity level (MSL) concern, suitable for high-reliability and sealed assemblies.
Breakdown and clamping — what the numbers mean for your rail
The 14.25V minimum breakdown voltage is the threshold where the device starts conducting avalanche current. For an 11.4V nominal rail, this gives roughly 2.85V of headroom — enough to avoid nuisance triggering from normal ripple or transients below the standoff level. The 21V max clamping voltage at 23.8A peak pulse current defines the worst-case voltage the protected circuit sees during a surge event. A downstream regulator or IC rated for at least 21V transient tolerance will survive. 500W peak pulse power is the device's surge handling capability under the standard 10/1000µs test waveform. For a given clamping voltage, this translates to a peak current of 23.8A. If the application's surge profile differs (e.g., 8/20µs), the derating curve in the datasheet applies — but the 500W rating is a reliable starting point for rail protection in general-purpose and industrial systems.