bellaroiet Posted October 24, 2022 Report Share Posted October 24, 2022 With the development of electronic products in the direction of lightness, thinness and smallness, PCBs are also developing towards high density and high difficulty, and the requirements of customers are getting higher and higher. The requirements for holes are also getting higher and higher. For example, there must be no solder resist ink entering the hole, causing tin beads to be hidden in the hole, no oil explosion, making it difficult to mount components, etc. PCB via hole plug purpose: to prevent tin from passing through the component surface from the via hole to cause a short circuit during PCB over-wave soldering, to avoid flux residue in the via hole, to prevent solder balls from popping out during wave soldering, causing short circuit, and to prevent surface solder paste The flow into the hole causes virtual welding, which affects the mounting, maintains the surface flatness, and meets the customer's characteristic impedance requirements. PCB plug hole requirements: copper in the via hole, solder mask can be plugged or not; there must be tin and lead in the via hole, there must be a certain thickness requirement (4um), no solder mask ink should enter the hole, causing the hole inside the hole. Hidden tin beads; through holes must have solder resist ink plug holes, opaque, and must not have tin circles, tin beads, and leveling requirements. Quote Link to comment Share on other sites More sharing options...
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