Surface finishes are essential to the functionality, robustness, and performance of the overall circuit board ( PCB ) assembly. PCBs are given surface finishes to prevent oxidation of exposed copper traces and to create a solderable surface on which components can be assembled. A number of considerations, including application, performance requirements, and cost, impact the choice of surface finish. The three most popular surface finishes ENIG (Electroless Nickel Immersion Gold), HASL (Hot Air Solder Leveling), and OSP (Organic Solderability Preservative) as well as their benefits, drawbacks, and typical applications will be discussed in this blog.
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