PCB Surface

PCB Surface Features PCB surface finish Comparison of cost and solderability Actual solderability: Electroplating nickel gold> HASL > OSP > ENIG >Immersion silver >Immersion tin Cost: Electroplating nickel gold > ENIG > Immersion silver> Immersion tin > HASL > OSP. The functions of the solder mask layer on the PCB board Preventing short circuit from bridge connection in the soldering process Preventing the physical breakage of a conductor circuit Prevent short circuit between conductive lines and solder joints when proceeding reflow soldering, wave soldering, and manual welding Preventing the copper layer from oxidation Its high Insulating brings the possibility to the high density of PCB finish Here are three main ways to add silkscreen coating on a PCB Manual screen-printing: This is a process that can be used when line widths are greater than 7 mm and the registration tolerance is 5 mm. Liquid Photo Imaging (LPI): This process provides more accuracy and legibility over manual screening and is used when line widths are greater than 4 mm Direct Legend Printing (DLP): This is the most accurate way of adding a silkscreen, however, it is very expensive. For more information about electronic manufacturing service china and turnkey pcb assembly, please feel free to contact us!