What Are Blind Vias, Buried Vias, and Micro Vias?

Edwin Robledo May 5, 2023

10 min read

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Learn what blind vias, buried vias, and micro vias are and how they play a particularly important role in PCB design.

In the world of printed circuit board (PCB) design, vias play an essential role in ensuring the efficient transfer of electrical signals between different board layers. The complexity of modern electronics and the increasing density of components in PCBs necessitates using various types of vias. Among these, blind vias, buried vias, and micro vias are particularly important. This article explores the differences between these three types of vias and their respective applications in PCB design.

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Blind vias

Blind vias connect an outer layer of a PCB to one or more inner layers without penetrating the entire board. As the name suggests, these vias are “blind” because they are not visible from the opposite side of the PCB. Blind vias offer several advantages, such as saving space on the board, enabling more compact designs, and improving signal integrity by reducing the length of signal paths.

Blind vias are drilled through the PCB’s surface layer and only extend a portion of the way through the board, linking the surface layer to one or more inner layers. They are a crucial component in current PCB design, allowing surface-layer components to be connected to inside layers while minimizing the number of layers necessary for routing.

Advantages of using blind vias

Examples of PCB designs that make use of blind vias

Smartphones, laptops, and other portable electronic gadgets, which require high-density PCB layouts to accommodate many components into a small space, are examples of PCB designs that use blind vias.

Blind via manufacturing considerations

Blind through hole production challenges include the necessity for accurate drilling and plating operations, which might raise manufacturing costs. Although laser drilling technology can enhance precision and save costs, it may only be appropriate for some PCB designs.

The aspect ratio of the vias, which is the ratio of the diameter to the depth of the via, must also be considered by designers. Larger aspect ratios might be more challenging, increasing costs and possible manufacturing problems.

Applications of blind vias include high-density interconnect (HDI) boards, where space is at a premium, and high-speed digital circuits, where signal integrity is crucial. Blind vias are typically more expensive to manufacture than through-hole vias, but their benefits often outweigh the added cost in demanding applications.

Buried vias

Unlike blind vias, buried vias connect two or more inner layers of a PCB without any connection to the outer layers. They are entirely hidden within the board and cannot be seen from either side. This feature allows designers to use the outer layers of the board for other purposes, such as placing components or routing traces, without interference from Vias.

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The primary advantage of buried vias is the increased density they enable in PCB designs. This is particularly useful in multilayer PCBs, where space for routing traces and placing components is limited. However, the production of buried vias is more complex and costly than through-hole vias, requiring additional manufacturing steps such as sequential lamination and drilling.

Advantages of using buried vias

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Drawbacks of using buried vias include

Larger aspect ratios might be more challenging, increasing costs and possible manufacturing problems. It is also critical to verify that the needed number of buried vias has enough space on the board and does not interfere with other components or traces.

Micro vias

The miniaturization of electronic devices has led to increased demand for more compact and efficient printed circuit board (PCB) designs. To meet these demands, designers have turned to using micro vias, which are small vias with a diameter of 150µm or less.

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Micro vias are tiny holes drilled into printed circuit boards (PCBs) to connect the various layers of the board. Lasers are commonly used to drill these holes, which have a diameter of fewer than 150 microns and are extremely precise. Their capacity to enhance circuit density while reducing board space is mainly responsible for its meteoric popularity over the past few years.

They are commonly used in high-density interconnect (HDI) PCBs to connect very fine-pitch surface-mount components, such as ball grid array (BGA) and chip-scale package (CSP) devices. The small size of micro vias allows for higher routing density and better signal integrity in these demanding applications.

Micro vias manufacturing typically involves laser drilling or other advanced techniques, which can be more expensive than traditional drilling methods. However, the improved performance and reduced board size achieved with micro vias often justify the additional cost.

Stacking micro vias can further optimize PCB designs by improving density and performance. The following discusses the effects and applications of stacked micro vias in PCB designs.

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These microscopic, laser-drilled interconnects enable designers to achieve complex, multi-layered designs within compact spaces. As a result, stacked micro vias have transformed the electronics industry, providing numerous benefits that range from size reduction to improved signal integrity.

Stacked micro via benefits

Signal integrity is critical for high-speed digital circuits and communication systems. Stacked micro vias improve signal integrity by providing a shorter, more direct path for electrical signals to travel between layers, reducing parasitic inductance and capacitance. These results can lower signal reflection and attenuation, improving overall performance in high-speed applications.

As electronic devices become smaller and more powerful, efficient thermal management becomes increasingly important. Stacked Micro vias facilitate better heat dissipation. By creating a network of micro vias or thermal vias, heat can be transferred from the heat source to other layers of the PCB, which can help dissipate the heat and prevent localized hotspots.

Advantages of using micro vias

Drawbacks of using micro vias

Micro vias are used in the following PCB designs

It is common to practice incorporating micro vias into high-density printed circuit board (PCB) designs, such as those utilized in smartphones, tablets, and other portable electronic devices. They are also used in high-speed digital and RF applications, both of which place a significant emphasis on maintaining signal integrity.

Considerations when constructing printed circuit boards (PCBs) with micro vias

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The similarities and differences between blind, buried, and micro vias

Similarities

Differences

Choose the best via for your PCB layout

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Tented vias are a type of via in printed circuit boards (PCBs) where the via holes are covered or “tented” with solder mask during the PCB manufacturing process. This means that the via holes are fully coated with solder mask material, a protective layer applied over the copper traces on the PCB to prevent solder bridging, short circuits, and other manufacturing and assembly issues.

Before deciding on the type of material to be used in designing a printed circuit board (PCB), it is crucial to consider numerous distinct issues seriously. This choice is required before the PCB can be manufactured. Such considerations have been implemented on the PCB.

Blind and buried vias are more suited to high-density systems with many layers, while micro vias are more appropriate for designs with fewer layers and smaller components. An increase in the prevalence of blind and buried vias has also been observed.

Micro vias are most useful in designs with few layers and small parts. Micro vias are most useful in designs where the number of layers is low, and the components are relatively small. Regulated impedance is essential for high-speed communications; therefore, more than one type of via will likely be needed.

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Blind, buried, and micro vias are essential tools in the PCB designer’s arsenal, enabling the creation of compact, high performance, and high-density boards. While they may come with additional manufacturing costs, these specialized vias are indispensable in meeting the demands of modern electronics. By understanding the differences and applications of each type of via, designers can optimize their PCB designs and achieve the best performance in their electronic products.

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We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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We can access your data only if you select "yes" for the categories on the previous screen. This lets us tailor our marketing so that it's more relevant for you. You can change your settings at any time by visiting our privacy statement

Your experience. Your choice.

We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

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Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.