The Comparison Between Blind Via and Buried Via in Manufacturing of Printed Circuit Boards

The Comparison Between Blind Via and Buried Via in Manufacturing of Printed Circuit Boards

There are several advantages of using buried vias as opposed to blind vias for the fabrication of printed circuit boards. Buried vias can be fabricated at a lower density without affecting the overall board size or layer count. This is advantageous for designers who need to save space while still meeting tight design tolerances. Buried vias also reduce the risk of breakouts.


Blind via fabrication involves a series of processes that begin by bonding a photosensitive resin film to a core. The photosensitive resin film is then overlaid with a pattern. This pattern is exposed to radiation. It then hardens. A subsequent etching process creates holes in the conductive layer. This process is then repeated on other layers and surface layers. This process has a fixed cost.

Blind vias are more expensive than buried vias because they must cut through a number of copper layers. They also have to be enclosed within a terminal point, which increases the cost significantly. However, this approach has many benefits, especially when manufacturing a PCB with high-density components. It improves size and density considerations and also allows for high signal transmission speed.

The least expensive of the two methods is the controlled-depth blind via. This method is usually done by using a laser. The holes need to be large enough for mechanical drills. In addition, they must be clear of circuits underneath.


Blind vias and buried vias are two different types of vias that are used in the manufacturing of printed circuit boards. They are similar in that they both connect to different parts of the inner layer of the boards. The difference lies in the depth of the hole. Blind vias are smaller than buried vias, which helps to reduce the space between them.

Blind vias save space and meet high design tolerances. They also reduce the chances of breakout. However, they also increase the manufacturing cost of the board, as they require more steps and precision checks. Buried vias are more affordable than blind vias, but it is important to choose the right electronic contract manufacturing partner for your project.

Both blind vias and buried vias are important components of a multilayer PCB. However, buried vias are much less expensive to produce than blind vias, as they are less visible. Despite these differences, blind vias and buried vias are similar in the amount of space they take up on the PCB. In the manufacturing process, both types require drilling via holes, which can account for 30 to 40% of the total manufacturing costs.

PCB construction

Through-hole via and blind via are two different types of electrical connections. The former is used for connections between the internal and external layers of the PCB, and the latter is used for the same purpose but without connecting the two layers. Through-hole vias are more common for two-layer boards, while boards with more layers may be specified with blind vias. However, these two types of connections cost more, so it’s important to consider the cost when choosing one type over the other.

The disadvantages of blind vias are that they are more difficult to drill after lamination, which may make it difficult to plate the boards. Furthermore, controlling the depth of the blind via after lamination requires very precise calibration. This constraint means that blind and buried vias are not practical for many board configurations requiring three lamination cycles or more.

The other major disadvantage of blind vias is that they are difficult to clean. As these are open cavities, air, and other foreign particles will find their way into them. Therefore, it is important to maintain a controlled environment to avoid any problems.

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