advantages of stacked vias
Stacked vias provide conductive pathways through the interior layers of multilayer circuit boards. They allow for a higher number of connections in a given space, increasing the functionality and performance of electronic devices. The choice between stacked or staggered vias in PCB design depends on the needs of a specific project and the complexity of the board. Choosing the right vias ensures that each connection is reliable and efficient.
Vias are an essential tool for allowing for the creation of high-performance PCBs, providing conduits for signal transmission between different layers. However, the selection of the proper vias for a specific application requires a thorough understanding of how each differs from one another and the advantages and disadvantages of each type.
Stacked and staggered vias are two distinct types of vias, both used in the construction of advanced multilayer printed circuit boards (PCBs). The main difference between stacked and staggered vias lies in the way in which they are formed in the PCB fabrication process. stacked vias are a common feature in HDI PCBs, where they are used to help facilitate more connections within a smaller space.
What are the advantages of stacked vias?
A stacked via consists of multiple through-holes that are drilled into the same layer of the circuit board, but which have holes at the top and bottom to allow solder to connect them. They are then layered atop each other, with the top layer of copper being metalized to create solder bumps. The resulting connection is then reflow soldered onto the component.
While a stacked via offers an advantage over a through-hole via in terms of its ability to support more connections, the added intricacy of the manufacturing process also means that it is typically more expensive. This is primarily due to the additional time required for sequential lamination and drilling, which can be a significant factor in the overall cost of a multilayer board.
Stacking vias can also be more susceptible to electrical crosstalk issues than other types of PCB connections. This is because the vias in a stacked setup line up vertically, which increases the likelihood of interference between adjacent layers of the circuit board. Staggered vias, on the other hand, eliminate this potential for interference by offsetting vias from each other instead of aligning them in a continuous vertical column.
Staggered vias can be a more dependable internal connection option when you have blind or buried vias with aspect ratios larger than 1:1 and when the drilling requirements span multiple layers. Staggered vias are also known as laminated blind or buried vias with different centers, and they can be the best option when you have tight tolerances, low parasitic capacitance, and routing flexibility in mind.
Both stacked and staggered vias are indispensable tools in the creation of sophisticated multilayer PCBs, particularly those requiring High-Density Interconnect (HDI) technology. They help to maximize the number of connections in a small space, allowing for more components and traces within a given footprint and enabling the miniaturization of electronic devices. The choice between these two via types is largely based on the unique needs of your PCB, and Sierra Circuits is happy to advise you on which solution is most appropriate for your project.