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Reg: silkscreen alignment

kannan sai

hi experts,can anyone explain me that what is the reason that we could not keep the silkscreen on a mask opened via and pads..as per manufacturing aspects after the mask is applied to outer layers..then the silk is printed..why should the silk doenot fall on mask opening?

  • It sounds more like a fabricator requirement. They are looking for a consistent surface on which to print the silk. If you state clearly in your fabrication notes that it's ok to print silk over pads/mask openings then this should not be a problem. Just convince your fabricator that it's ok and move on. (Personally? I do not allow silk over pads or mask though)
  • The inks used for silkscreening are similar to solder resists. When the silkscreen is printed onto a bare pad, and you try to solder to it, the ink with contaminate the solder and make for a bad joint that will fail most categories of PWA to IPC-610. If the pad is just going to be an unsoldered pad then this will not pose a problem, but then why not cover the pad with solder resist anyway? This will protect the copper from corrosion and provide a level surface for the silkscreen ink.
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