Pdf — Ipc4556

If you are evaluating ENIG finishes, the official standard outlines several non-negotiable parameters. Here is a summary of what the IPC-4556 PDF contains:

(1.2 µin). The gold layer protects the palladium from contamination and maintains solderability. ipc4556 pdf

The document stipulates minimum and maximum copper thicknesses based on the final application. For Class 3 (high-reliability electronics), uniformity across the panel is strictly enforced to prevent current density hotspots. If you are evaluating ENIG finishes, the official