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Surface finishing is one of the last steps in the PCB manufacturing and assembly. Various types of surface finishing is available around. In the previous post, we have discussed some popular surface finishing treatments for printed circuit boards. In this post, we will introduce you to a few others.
Following are some more types of the common surface finishing types available for printed circuit boards.
Gold Fingers: Gold fingers or hard gold surface finishing provides a planar surface, especially for wear applications such as edge connector fingers, and keypads. This surface finishing can be combined with other surface finishing treatments to provide a reliable solderable surface.
Advantages of Gold fingers
Disadvantage of Gold fingers
ENIG: ENIG (Electroless Nickel / Immersion Gold) surface finishing features a coating of silver applied over the nickel layer in the ratio of 2-8 μ and 120-240 μ. It offers double layer metallic coating, where nickel acts a barrier to copper in order to protect it from oxidation. Secondly, the layer of nickel is protected by gold, which prevents it from disintegration during the assembly.
Advantages of ENIG
Disadvantages of ENIG
ENEPIG: ENEPIG or Nickel Palladium surface finishing is the advanced ENIG surface finishing with the addition of palladium layer. Palladium being harder than gold offers better solderability and antifriction properties. This type of surface finishing is good for semiconductors and various medical and military applications.
Advantages of ENEPIG
Disadvantages of ENEPIG
As seen, all the above-mentioned surface finishing have their own pros and cons. Hence, choosing the right surface finishing for a particular application may get tricky. In such situation, it is always better to approach an industry expert with a vast experience. Creative Hi-Tech is one of the reputed PCB assembly and manufacturing services offering PCBs in various surface finishing options.