Note
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.
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