Ipc4556 Pdf [better]
Because of its high reliability and cost-efficiency relative to thick pure-gold finishes, ENEPIG boards compliant with IPC-4556 are standard across several high-consequence industries:
Excellent wetting for both lead-free (SAC305) and leaded (Sn63Pb37) alloys.
One of the most challenging aspects of heavy copper is the aspect ratio of drilling. IPC-4556 provides specific guidelines on the plating thickness for holes in heavy copper boards. Getting the copper to plate evenly inside a hole when the surrounding copper is 200µm+ thick is a fabrication nightmare; this standard defines the acceptance criteria. ipc4556 pdf
IPC-4556 is the industry standard titled
Plating thickness varies with plating area. Smaller features result in thicker plating, so pad size used for measurement must be consistent for both calibration and production readings. Because of its high reliability and cost-efficiency relative
Destructive testing where a sample PCB is cut, polished, and viewed under a scanning electron microscope (SEM) to verify grain structure and interface quality.
Protects the palladium from contaminants and ensures high-quality solderability and wire bondability. Getting the copper to plate evenly inside a
The standard may be used to specify acceptance criteria to meet performance requirements in addition to those found in the IPC‑6010 series (IPC‑6012, IPC‑6013, and IPC‑6018) of standards.
Protects the nickel layer from hyper-corrosion during the immersion gold process. It enhances wire bondability and strengthens the intermetallic bond. 3. Immersion Gold (Au) Thickness Requirement: 0.03 to 0.09 µm (1.2 to 3.5 µin).
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