ENIG

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ENIG is an acronym for Electroless Nickel/Immersion Gold. It is a type of surface plating commonly used for Printed Circuit Boards.

Contents 1 Description 1.1 Advantages of ENIG 1.2 Disadvantages of ENIG 2 Specifications

[edit] Description

It consists of an Electroless nickel plating covered with a thin layer of immersion gold for protecting the nickel from oxidation.

[edit] Advantages of ENIG

• Excellent surface planarity (compared to e.g. HASL)
• Good oxidation resistance
• Usable for untreated contact surfaces (e.g. membrane switches and contact points)

[edit] Disadvantages of ENIG

• "Black Pad" reliability problem

[edit] Specifications

IPC Standard: IPC-4552