Understanding IPC-4556: The Standard for ENEPIG Surface Finish is the industry-standard specification for
Implications of IPC-4556 PDF
The IPC-4556A revision introduced several critical updates to address modern manufacturing challenges: ipc-4556 pdf
Note: The 2015 Amendment and Revision A introduced an absolute maximum for the gold layer ( 0.0700.070
Think of the IPC-4556 specification as the "Universal Finish" story because it bridges the gap between different assembly needs that previously required separate finishes. Printed Circuit Design & Fab The Problem Protects the nickel from corrosion during the immersion
If you are analyzing an IPC-4556 PDF, you must pay close attention to the following core sections. These are the non-negotiable parameters that define a compliant ENIG finish.
Protects the nickel from corrosion during the immersion gold process and improves solder joint reliability. Immersion Gold (IG): military systems |
standard provides the comprehensive industry specifications for
| Class | Description | Typical Applications | | :--- | :--- | :--- | | Class 1 | General Electronic Products | Consumer electronics, toys, simple remote controls | | Class 2 | Dedicated Service Electronic Products | Industrial controls, automotive (non-safety), computers | | Class 3 | High Performance Electronic Products | Medical implants, aerospace avionics, military systems |