What are microvisa in printed circuit boards?
Editorial Team - PCB Directory
Jan 21, 2022
A Microvia is basically a very small via. Most PCBs now days are multi-layer boards. Vias are used to make connections between each layer of the printed circuit board. Microvias, as the name suggests have a smaller diameter and thus take up less board real estate and leave more space for routing. They also have a lower parasitic capacitance which is important for high-speed circuits. However, the manufacturing process tends to become more complex and more expensive compared to regular vias i.e Through Hole vias or Blind/burried vias.
Most PCB companies classify vias with a diameter less than 150 microns to be microvias. These vias lower the possibility of any type of manufacturing defect since they are drilled using lasers which mitigates the chances of any residue left after the process. Because of their small size and ability to connect one layer to the next they enable denser printed circuit boards with more complex designs. Most HDI printed circuit boards use microvias.
Microvias are used to connect one layer of the board to its adjacent layer and have a very small diameter in comparison to the mechanically drilled vias such as PTH (Plated Through Hole).
Microvias are of two types, Stacked and Staggered.
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