The Search for the Universal SURFACE FINISH

摘要

There are over a dozen surface finishes on the market. All are useful for some applications, but none really fit the category of "universal surface finish." This article will highlight each of the common surface finishes with regard to advantages and shortcomings, and itemize what is paramount to the PCB design community when choosing the correct finish for bare boards. My goal is to spark industry interest in resolving the technical issues surrounding existing processes and to develop new products. My point of view is that of an OEM, though I also share concerns of fabrication and assembly. Finally, the paper will also discuss the industry needs going forward; especially regarding the tight pitch tendencies and higher speed requirements of future systems.