The standard specifies requirements for Electroless Nickel/Electroless Palladium/Immersion Gold (ENEPIG) plating for printed boards . It establishes critical performance criteria for thickness, solderability, and wire bonding to ensure reliability in high-density electronic assemblies. Core Specifications
The IPC (Association Connecting Electronics Industries) is the global trade association that establishes standardized requirements for the manufacture of electronic equipment and assemblies. When ENEPIG emerged as a viable commercial finish, the IPC Plating Processes Subcommittee formed a dedicated task group to establish a reliable, repeatable metric for its application. The result was the publication of IPC-4556. This document does not merely dictate thickness requirements; it provides a comprehensive framework for process control, quality assurance, and failure analysis. ipc-4556 pdf
The IPC-4556 PDF document covers the following key topics: When ENEPIG emerged as a viable commercial finish,