Type I: Tented Vias-vias that have a mask material applied, bridging over them, with no additional material inside the holes. IPC defines seven types of vias in IPC-50M, Terms and Definitions for Interconnecting and Packaging Electronic Circuits. Simply put, vias are Plated-Through Holes (PTHs) passing through one or more layers in a PCB, connecting traces on its way. Also, just like there are various types of PCBs, there are multiple types of vias with their own functionality.
Just as a printed circuit board (PCB) is a means to allow interconnection of different components, vias are means to interconnect different layers on and within the multilayered PCBs.
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