, this performance specification sets the definitive requirements for ENEPIG, a "universal" surface finish that addresses the diverse needs of modern electronic assemblies, including soldering, wire bonding, and electrical contact performance. Technical Composition and Requirements According to the IPC-4556 specification
Key changes from the original to IPC-4556A include: ipc4556 pdf
June 2025. Specification for Electroless Nickel/Electroless Palladium Immersion Gold (ENEPIG) Plating for Printed Boards. Accuris Standards Store ipc4556 pdf
If your application involves very fine-pitch (below 0.3mm) or multiple reflow cycles, ENIG per IPC-4556 remains the gold standard—literally. ipc4556 pdf