Ipc4556 — Pdf

IPC-4556 is an industry specification titled "Performance Specification for Thick-Film Copper (Cu) Plating for High-Performance Applications." It was developed by IPC (Association Connecting Electronics Industries) to standardize the requirements for thick copper plating on PCBs, particularly for high-reliability sectors like aerospace, defense, medical devices, and high-power electronics.

The standard defines the acceptable thickness, adhesion, porosity, and thermal reliability of plated copper used as a surface finish. Unlike standard electrolytic copper, "thick-film" copper under IPC-4556 typically ranges from 10 to 40 microns (µm) or more, depending on the application class. ipc4556 pdf

Many designers mistakenly assume that any thick copper plating will suffice. However, without adherence to IPC-4556, you risk: Many designers mistakenly assume that any thick copper

IPC-4556 mandates a minimum peel strength for thick-film copper, ensuring the plating does not delaminate from the laminate substrate during thermal cycling or mechanical stress. The IPC-4556 PDF outlines thermal shock and aging

Assemblies undergoing multiple reflow cycles must maintain integrity. The IPC-4556 PDF outlines thermal shock and aging tests that the plated copper must survive without cracking or oxidation failure.