PCB Fabrication

Difference Between Gold Plating And Enig

by:A-TECH      2020-11-08

Although many floor plating choices are available, it’s in your best interest to analysis which one is most applicable for every individual design and end-use software. If your project does indeed require RoHS-compliance, you would possibly need to think about using lead-free HASL. Lead-free HASL is a process just like HASL only with out the lead, specifically the tin-lead solder. Materials used, instead of the lead, are tin-copper, tin-nickel, or tin-copper-nickel germanium. Although this lead-free HASL process is an economical one that offers RoHS compliance, it’s similar to the regular HASL process within the sense that it’s not perfect for smaller elements.


A excessive purity nickel layer freed from organic codeposits similar to sulfamate nickel is very recommended to make sure probably the most sturdy solder joint. If in case of any injury, it’s very easy to verify and substitute the particular failure components. The digital parts and their polarities on a correctly designed, printed circuit boards are clearly labeled on the board. OSP is a water-primarily based, natural surface end that's usually used for copper pads. It selectively bonds to copper and protects the copper pad earlier than soldering.


We provide good quality pcb proto meeting samples taconic pcb samples printed circuits board samples for reference. HASL leaves uneven surfaces and isn't appropriate for fantastic pitch components. Although it does are available in lead-free, there are different lead-free choices which can likely make extra sense for a high-reliability product. Bare PCB copper traces should at all times be coated with an anti-corrosion surface finish for safeguarding the uncovered copper from oxidization and deterioration.


OSP is environmentally friendly, provides a coplanar surface, is lead-free, and requires low tools maintenance. However, it’s not as robust as HASL and may be sensitive while dealing with. HASL or hot air solder leveling is a type of finish used on printed circuit boards . Early ENIG processes had poor adhesion to copper and lower solderabiliy than HASL. In addition, a non-conductive layer containing nickel and phosphorus, often known as 'black pad', may type over the coating because of sulfur-containing compounds from the solder masks leaching into the plating bath.


When soldering to a gold deposit, the preliminary wetting and solder joint is shaped to the gold layer. However, fast dissolution of the gold into the solder joint results in final solder bond being made to the underlying layer. As such, the underlayer should a strong solderable surface or dewetting of the solder joint can occur.

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