Buried Via Affect PCB Cost
When designing PCBs, there are a number of different techniques for connecting components to one another. These include escape routing, standard routing and using blind and buried via holes. Blind and buried vias are used in high-density circuit boards (HDI-PCB) to optimize density and save space.
While there are several benefits to using buried and blind vias, they can add cost to the manufacturing process. This is because of the additional steps required in creating them, and the increased fabrication costs associated with using these vias. The use of buried and blind vias also affects the overall size of the circuit board, which can impact performance and cost.
A buried via is a copper-plated hole that connects internal layers of a multilayer circuit board without touching the outer layer surfaces. It is commonly referred to as a hidden via because it is not visible from the outside surface of the PCB. Buried vias are useful in multilayer PCBs, because they allow designers to reduce the number of through-hole vias needed to connect components and traces. This can be done by using a buried via to connect the top and bottom of the inner layer, or by connecting multiple internal layers with a buried via.
How Does a Buried Via Affect PCB Cost?
There are a few important considerations to keep in mind when using buried and blind vias, including their manufacturing cost implications and compatibility with the design process. The manufacturing cost of a buried via depends on the number of layers the via passes through, the aspect ratio of the hole (hole diameter compared to drill depth) and the layer stack-up. Choosing a larger aspect ratio for a buried via can increase the cost, since the drilling and plating operations will require more precise work.
The cost of a buried via also depends on the type of connection it makes. Blind and buried vias are more expensive than through-hole vias because they are made up of multiple separate connections rather than a single connection. In addition, a buried via is more difficult to inspect during assembly because the copper coating is not exposed on the surface of the PCB.
There are many applications for a buried via, including power electronics, telecommunication equipment and industrial control systems. This is because buried vias provide a more direct path for signals, which can help improve signal integrity and reduce the risk of electromagnetic interference. In addition, buried vias can help to reduce the overall footprint of the circuit board, which is critical for saving space and improving performance. For more information about the different types of vias and how they are used, watch this on-demand webinar from Altium.
A buried via is a type of via that connects two or more inner layers of a multi-layer PCB but does not pass through the entire thickness of the board. Unlike through-hole vias, which extend from the top to the bottom of the PCB, buried vias are confined within the interior layers. These vias are typically used when there is a need to establish electrical connections between inner layers without interfering with the outer layer traces, thus providing a cleaner, more compact design.
