![]() Typically, smaller vias are easier to fill or tent. Whether or not you tent a via comes down to the design of the PCB and the size of the via. Covering the vias could limit the opportunity to find these issues and fix them before it’s too late. When the PCB is in the prototype phase of the manufacturing process, leaving the vias exposed helps to find any issues with the traces, allowing you to fix and reroute them. That small hole can trap in moisture and chemicals that can cause corrosion and damage the PCB. One downside to tenting is that since the solder mask used is liquid, there is the chance of the LPI breaking and creating small holes in the tent. Tenting vias is not the most effective method for covering the via. Tenting a via with liquid photoimageable solder mask is the most cost-effective way of tenting. Tenting vias are a cost-effective way of providing protection to the vias and the copper around it. It also helps reduce the possibility of a short from happening from solder bridging. When left exposed, the elements can decrease the integrity of the components and lead to corrosion. Using the tenting method also reduces the number of conductive components that are exposed to external elements. ![]() Tenting via creates a barrier that can help prevent any damages to the PCB layers. Just like the solder mask prevents the copper traces from oxidizing and corroding, the solder mask does the same thing for the via. Tenting vias has many advantages for a PCB, the first being the protection the solder mask provides to the vias. If you’re wondering whether or not you should tent the vias on your PCB, it comes down to the design and manufacturing requirements of your board. Tenting a via has both positive and negative impacts on the PCB. ![]() ![]() When a via is tented, the manufacturer used a solder mask to enclose the opening. The purpose of tenting is to limit the number of exposed conductive pads on the PCB. Tenting a via means you create a tent-like shape over the hole to cover the via. No matter the size, vias connect each layer of a PCB together.
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