Electroless Nickel/Electroless Palladium/Immersion Gold (ENEPIG) as a surface finish for printed boards. Saturn Flex Systems
The core of the IPC-4556 PDF specification defines the precise thickness ranges for each of the three metallic layers. These measurements are typically verified using . IPC-4556 Thickness Standards Metric Range (µm) Imperial Range (µin) Primary Function Electroless Nickel 3.0 – 6.0 118.1 – 236.2 Diffusion barrier & mechanical support Electroless Palladium 0.05 – 0.15 2.0 – 6.0 Prevents nickel corrosion; enables wire bonding Immersion Gold 0.030 – 0.070 1.2 – 2.8 Prevents oxidation; maintains solderability ipc-4556 pdf
One of the most overlooked sections in any is the classification of performance. Like many IPC standards, IPC-4556 defines three classes based on intended use: $150–200 for non-members (prices vary
: Recommends using X-Ray Fluorescence (XRF) spectroscopy as the standard for measuring the thickness of these thin metallic layers. check current site)
(https://shop.ipc.org) – Single-user PDF: Approximately $70–100 USD for IPC members, $150–200 for non-members (prices vary; check current site)
Electroless Nickel/Electroless Palladium/Immersion Gold (ENEPIG) as a surface finish for printed boards. Saturn Flex Systems
The core of the IPC-4556 PDF specification defines the precise thickness ranges for each of the three metallic layers. These measurements are typically verified using . IPC-4556 Thickness Standards Metric Range (µm) Imperial Range (µin) Primary Function Electroless Nickel 3.0 – 6.0 118.1 – 236.2 Diffusion barrier & mechanical support Electroless Palladium 0.05 – 0.15 2.0 – 6.0 Prevents nickel corrosion; enables wire bonding Immersion Gold 0.030 – 0.070 1.2 – 2.8 Prevents oxidation; maintains solderability
One of the most overlooked sections in any is the classification of performance. Like many IPC standards, IPC-4556 defines three classes based on intended use:
: Recommends using X-Ray Fluorescence (XRF) spectroscopy as the standard for measuring the thickness of these thin metallic layers.
(https://shop.ipc.org) – Single-user PDF: Approximately $70–100 USD for IPC members, $150–200 for non-members (prices vary; check current site)
