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The HDI process is a high-density interconnection technology used to manufacture high-performance and high-density printed circuit boards (PCBs). HDI technology achieves more compact and complex circuit layouts by increasing the number of layers, reducing the line widths and spacing, and adopting advanced manufacturing processes.
Blind and buried vias are two types of vias commonly used in printed circuit board (PCB) designs to provide interconnections between different layers of the board.
Blind vias are vias that connected the outer layer to other inner layers, but they do not extend through the whole board. Blind vias allow for shorter interconnections, reducing signal delays and improving overall performance. They are commonly used when space is limited on the PCB outer layers, or when high-density components require shorter connections.
On the other hand, buried vias are vias that connected inner layers without extending to the outer layers. During the manufacturing process, the vias are drilled and filled with conductive material between the inner layers, without penetrating the outer layers. Buried vias can improve design flexibility and enable more complex multilayer PCB designs, as they free up space on the outer layers for routing traces or placing components.