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Via Covering means that the via is covered by a solder mask or other chemical materials. Why do I sometimes need to cover vias during PCB manufacturing? Because if the through hole is exposed, solder paste may enter the through hole and cause poor solder joints or short circuits. The situation where the via is not covered is called a via opening.
Three types of Via Covering
Via tenting means that the through hole is only covered by solder mask ink. . This is the easiest way of Via Covering. No additional process steps are required in the manufacturing process. Cover the rings and through holes with solder mask to prevent exposure to the components and reduce accidental short circuits or contact with circuits. Generally, vias using this type of coverage should not be larger than 0.3mm.
The solder mask can be applied to both sides of the PCB or only one side of the PCB.
Via plugging is a case where the via is partially closed with a non-conductive medium (epoxy/resin) and a layer of solder mask. There may also be no solder mask. Single-sided vias are recommended for multilayer PCBs.
The diameter of the plug hole is required to be less than 0.5mm, and the via hole can also be filled on both sides or on one side.
Via filling means that the via is completely filled with non-conductive material. Sometimes there is a solder mask on the non-conductive filler.
Via filling is often divided into two types:
1) The through hole is filled with a non-conductive medium and covered with a conventional solder mask.
2) Fill the through holes with non-conductive paste after the through holes are plated through. Then when the paste hardens, the through holes are metalized and electroplated, and the surface is leveled. In this case, the surface of the via is solderable, and additional traces between BGA vias can be added.
Click for more detailed Via Covering information. We recommend that you choose a type of via coverage based on your budget and PCB quality requirements. If you don’t know which Via Covering is suitable for your board, please contact us and we will give the best advice.