Manufacturing Glossary
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Surface Finish

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Surface Finish

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Surface Finish Definition

Surface Finish, when discussing a PCB, relates to a post-etching treatment that is applied to any exposed copper on the circuit board. Copper tarnishes very easily, so a layer of secondary material is added to protect the copper for long term use and storage. The finish also acts to provide a solder compatible surface for assembly.

Typical surface finish treatments are HASL, ENIG and OSP, each providing different levels of protection at different manufacturing costs.

Surface Finish Examples

Further Reading

PCB Surface Finishes

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About The Author
Dan Hienzsch
Dan Hienzsch
Dan has been involved with electronics for over 20 years designing circuits and systems for both private as well as commercial uses. Recently he spent 3 years running a rapid prototyping lab to help designers and engineers turn their product concepts into manufactured reality.