![]() Thankfully, these calculators allow you to play around with your input values, and you can quickly get a sense for the appropriate via size if you don’t have access to advanced design tools. Normally, choosing a via works in the other direction the desired thermal and electrical demands are specified by the design requirements, and the minimum allowable via size needs to be determined. These calculators are typically one-way you enter your desired via size, and the calculator outputs the resulting thermal electrical characteristics. There are some calculators that can be useful for estimating the thermal and electrical demands in a via. Vias with larger aspect ratio can be less reliable under thermal cycling and can be more difficult to fabricate. When you are trying to reach the inner layers of a PCB with thin vias, you’ll need to consider the via aspect ratio during design. This means you’ll want to use smaller vias to route between layers as trace and component density become extremely high. Moving to smaller traces is necessary when you need to accommodate more components on your board. Thicker traces tend to be more reliable and can handle more current, but they take up more space on the board. You’ll have to balance trace density with trace size, especially as component and pin count density on your components increase. The via size you’ll require depends on a number of factors, particularly the width of your traces. Via Sizing in Your Next Multilayer PCBĪny multilayer PCB requires vias in order to route connections between the outer and inner layers. If you’re unsure how to size or fabricate your vias, you’ll need to consider a number of aspects, ranging from thermal demands to the overall manufacturing process. Using vias to route connections between components via the inner board layers saves a huge amount of board space. ![]() Later on, I learned more about using design software for multilayer design. I eventually had a tangled mess of wires on the top and bottom sides of the board connecting multiple components. Once things got more complicated, board space became a real consideration, and components were packed too close for comfort. The first PCBs I made as a young engineer were pretty simple, with wires used to connect components on the top side of the board.
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