Ipc-4556 Pdf Repack -

| Class | Description | Typical Applications | | :--- | :--- | :--- | | | 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 |

You can find the official document and its revisions through these sources: ipc-4556 pdf

IPC-4556 establishes the industry standard for Electroless Nickel/Electroless Palladium/Immersion Gold (ENEPIG) plating, providing requirements for layer thickness to ensure reliable solder joints in PCB applications. It specifically defines ranges for nickel (3.0-6.0 ), palladium (0.05-0.15 | Class | Description | Typical Applications |

: Recommends using X-Ray Fluorescence (XRF) spectroscopy as the standard for measuring the thickness of these thin metallic layers. IPC-4556 was established to provide clear requirements for

Surface finishes serve two primary roles: protecting the copper circuitry from oxidation and providing a solderable surface for component assembly. IPC-4556 was established to provide clear requirements for ENEPIG, offering a more robust alternative to Electroless Nickel/Immersion Gold (ENIG) by adding a palladium layer that protects the nickel from hyper-corrosion.

, the plating layers must meet specific thickness requirements to ensure reliability: Nickel (Ni): 3.0 to 6.0 (118 - 236

Adoption of IPC-4556 requires PCB fabricators to upgrade their capabilities significantly.