Ipc4556 Pdf

Barrier against copper diffusion; provides mechanical support for holes. (118.1 – 236.2 µin) Electroless Palladium (Pd)

According to the specification, the standard thicknesses for ENEPIG are: 3.0 to 6.0 [118 to 236 Electroless Palladium: 0.05 to 0.15 [2.0 to 5.9 Immersion Gold: Minimum 0.03 Solderability and Wire Bonding Metrics

) standard deviations from the process mean , typically evaluated on a reference test pad. 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.

In the world of Printed Circuit Board (PCB) manufacturing, surface finish specifications are the bedrock of reliability, solderability, and performance. Among the most critical—yet often misunderstood—standards is . For engineers, procurement specialists, and quality assurance professionals, finding a legitimate IPC-4556 PDF is a constant challenge. This article serves as a comprehensive resource, explaining what IPC-4556 is, why it matters, how it differs from other IPC surface finish standards, and where to legitimately access the document. and quality assurance professionals

To ensure you are working with the most current, legitimate version (IPC-4556A), it is highly recommended to obtain the document directly from official sources:

If you are looking for the to understand the specifications, requirements, or testing methods for ENEPIG, this article provides a comprehensive overview of what the standard covers, why it matters, and how to adhere to it in 2026. What is IPC-4556? explaining what IPC-4556 is

Deposited directly onto the activated copper. It serves as a robust diffusion barrier that prevents copper from interacting with upper layers and strengthens plated-through holes.