Buried Via PCB

In a multi-layer PCB, buried vias are plated connections between the inner layers that are not visible on the outside layers. Similar to a typical two-layer PCB or even a multi-layer plated through-hole PCB, buried vias are made by drilling and copper plating the inner layer core (pairs) of a multi-layer PCB.

The buried vias might give the board more area and possibilities because many PCB boards are tiny and have limited space. For example, the buried vias will aid in clearing space on the board’s surface without interfering with the upper or bottom layers’ surface components or traces. Although they can be utilized with a wide variety of PCBs, blind and buried vias are typically employed with high-density interconnect PCBs or HDIs. Because they can provide increased layer density and improved power delivery, HDIs are widely used.

It will also assist in keeping the board lighter and smaller by using concealed vias, which is quite beneficial when constructing electronics. They are frequently found in cellphones, tablets, computers, medical equipment, and other comparable compact electronics.

For individuals in need, the buried vias can be useful, but they can also raise the PCB’s cost. This is because adding them to the board will involve additional labour in addition to the testing and production that will be necessary. This means that in order to have a fantastic board that is tight and effective, you should only utilize them when absolutely essential.

The proper addition of buried vias to the PCB is crucial, which makes selecting the right manufacturer crucial. At Advanced Circuits, PCB runner offer dependable PCB assembly and fabrication that satisfies your requirements.

Our expansive printed circuit board manufacturing plant employs cutting-edge machinery and processes to deliver quality and reliability. Before any order is put into production, it is reviewed by a free engineering file reviewer. This makes it easier to verify that the boards are made correctly and function. Unusable boards are something that nobody likes to get. Time and money would be squandered.

A reliable manufacturer is also aware of how crucial it is that you receive your boards on schedule. We can quickly turn around PCBs with buried and blind vias for you, in addition to expedited shipment.

It’s important to know how much the order will cost you when selecting a manufacturer. We provide quick quotations for PCBs.

The appropriate company can make it simple and quick to receive the PCBs you need, even if they contain blind and buried vias. Superior customer service, dependable goods, and top-notch production are all provided by Advanced Circuits.

Buried via PCB in PCB manufacturing services

PCB Runner’s Buried Via Manufacturing Capabilities

In the electronics manufacturing sector, PCB Runner, a seasoned provider of expert PCB creation services, has over ten years of experience. The majority of the businesses we manufacture PCBs for are global in scope and have been with us since the beginning. We work hard to keep our clients’ satisfaction levels at or above 99%, and we take pride in offering the best service available.

We are able to adapt to our client’s changing needs because of our flexibility. Because we are adaptable, we can work with the most precise, efficient, and economical design and manufacturing methods.

As the PCB surface is smaller and the topography is more compact, building HDI PCBs requires a PCB Runner to place components on the PCB with greater accuracy. With over ten years of expertise, PCB Runner’s workforce is knowledgeable and skilled enough to manage the assembly of HDI PCBs.

With our HDI boards, we provide buried vias. All of the micro vias in our HDI boards are drilled using lasers. We can create extremely tiny vias with laser drilling that are not possible with traditional mechanical drills. In addition, micro-vias are more dependable than standard vias.

PCB Runner offers HDI PCBs

High-density interconnects are necessary for today’s miniature electronic assembly (HDI). The miniaturization properties and advantages of HDI are necessary for SMT technology to provide the following:

Greater Tolerances

  • Traces and pads spaced densely apart
  • Several Layers on a Single PCB with Microvias Allow Signals to Pass Through
  • HDI assists with the shrinking sizes of SMT components and provides a notable reduction in size and weight. You simply cannot function without HDI technology when you use a lot of flip chips and BGAs.

Please contact PCB Runner if you have any needs for HDI PCBs; our professionals can assist you with the project’s design and development.

Buried Via PCB Design and Manufacturing Process

Design Recommendations for Buried and Blind vias:

Both buried and blind vias have unique design guidelines. The same is covered in depth in the section that follows.

Defining specifications:

explicit specifications at an early stage of the design process might help prevent mistakes like inflexible design patterns later on. Aspect ratio, depth, and route diameter are important parameters. The ratio of the via’s diameter to depth is known as the aspect ratio. The aspect ratio for buried and blind vias should be between 0.8 and 1.0.

Set Vias Up in a Grid:

By arranging the vias on a grid, you can make sure they are evenly spaced apart and don’t go too near to one another. Based on the pitch of the components that are utilized on the board, the grid spacing should be selected.

Maintaining  minimum Annular Ring:

The copper pad that surrounds the via and provides the electrical connection is the annular ring. The minimum annular ring size for buried and blind vias is 0.1 mm.

Placing Vias at a distance:

Signal noise and electrical interference can result from placing vias too close to one another. Blind and buried vias need to be separated by at least 0.2 mm.

Placing vias away from the board edge:

Drilling vias close to the board edge may result in manufacturing issues. Place the vias at least one millimetre from the edge of the board.

Observe the Fabrication Guidelines:

When fabricating PCBs, blind and buried vias call for extra processing stages. To guarantee the successful construction of the PCB, it is crucial to adhere to the fabrication requirements supplied by the manufacturer.

Test Prototype PCBs:

Early on in the process, testing prototype PCBs can assist in identifying design or fabrication issues. Before committing to a complete manufacturing run, it is advised to test a few prototype PCBs.

PCB Technology: A Method for Buried Vias.

The following sophisticated PCB fabrication methods allow for the creation of buried and blind vias:

The process of sequential lamination

Pre-formed vias positioned in between the layers are used to laminate each internal layer together. permits a considerable deal of flexibility in the route structures.

Ablation using Laser

When necessary, conformal dielectric coatings can be selectively ablated by lasers to open blind or buried via connections.

Etching with Plasma

Selective exposure of metal pads to open blind vias can be achieved by plasma etching through thin dielectric layers.

Image Tenting

Selective tenting over vias is made possible by photo-imageable dielectric layers, which only leave openings where it is desired to have buried or blind vias.

When using buried vias, any of these processes calls for certain PCB facilities and protocols. As such, the expenses are higher than those of regular multilayer boards.

You should search for the following six quality control areas in a PCB CM:

  • IPC accreditation: Your board’s production technicians must to be qualified in soldering, reworking, and other assembly tasks. 
  • Component knowledge: To ensure that your board is constructed using the best parts, the CM should have engineering procedures and checks in place.
  • Processes Control: System and assembly methods that are documented are essential to preserving manufacturing process uniformity.
  • Verifications of assembly: Solder joints on assembled boards should be checked both before and after soldering.
  •  Test and Inspection: Every task must be continuously confirmed using a variety of automated and manual inspection methods.
  • Functional workstation: Complex printed circuit board assemblies must be constructed on an orderly and well-maintained assembly line that spans the factory and includes each individual workstation.

Applications of Buried Via PCB

Uses for PCB High-Density Buried Via Interconnects

High-density interconnect (HDI) applications frequently use buried via PCBs because of their capacity to minimize PCB size, conserve space, and enhance functionality. Buried vias are a perfect way to achieve compact designs because HDI PCBs need more connections in smaller spaces. Devices like computers, tablets, and smartphones are a few instances of HDI applications. 

Equipment for Telecommunications

High-speed performance and signal integrity are essential for telecom equipment. Since PCBs can efficiently minimize signal reflection, reduce interference, and enhance signal routing, they are well-suited for telecommunications systems, including base stations, switches, and routers. Buried via PCBs creates an environment that is favorable for these requirements.

Medical Equipment

Medical equipment frequently needs to be extremely precise and reliable. These needs are met in part by PCBs that are buried, which provide more sophisticated routing, enhance electrical performance, and increase component density. Medical devices such as defibrillators, pacemakers, and diagnostic imaging equipment can benefit from being buried via PCBs.

PCB Runner Quality Control Commitment

Strict Quality Control

At PCB Runner, we recognize the value that PCB functionality and quality have for our clients. For this reason, we incorporate quality-oriented concepts throughout every stage of the assembly and production of PCBs. We are still dedicated to conducting all PCB-related activity in accordance with recognized worldwide quality standards.

We ensure that every one of our assembled and bare PCBs meets or surpasses the exact specifications provided by our customers. Our reputation for excellent quality, timely delivery, and competitive pricing is attested to by our clientele.

Our products are guaranteed to be of the highest quality and dependability thanks to our strict manufacturing procedures. International standards like ISO9001 are met by us, and we are eligible for IPC Classes 2, 3, and 3A.

Why Opt for PCB Runner?

There are various benefits to selecting PCB Runner as your printed circuit board maker. We provide quick turnaround times on all kinds of high-quality PCB services. We put every PCB through quality and reliability testing.

Kindly visit our website to acquire an estimate for any bespoke circuit board you may need.

Certifications and Registrations for PCB Runners


We withhold a number of PCB certifications as a symbol of our dedication to the quality management system, demonstrating our steadfast commitment to upholding standards of quality.

Use the icons below to browse through our official certifications.

The 2015 ISO 9001 standard

ISO 14001:2015

ISO 13485:2016

Our engineers are all certified IPC A-610 personnel. Please get in touch with us if you would like more information.

Advantages of choosing PCB Runner:

For the production and assembly of fully functional printed circuit boards, PCB Runner is the recommended option. The diversity and adaptability of the solutions we provide are preferred by our clients. We provide every kind of printed circuit board you need, ranging from single-layer to multi-layer, rigid boards, rigid-flex boards, and HDI boards. No matter the quantity of your purchase, we can handle boards of any form or size that you require.

The fact that PCB Runner has specialists for every step of PCB assembly and manufacturing is by far our greatest asset. We provide PCB fabrication and assembly services that are full turnkey, partial turnkey, and full feature. To put it briefly, we provide a comprehensive end-to-end solution for your projects. From design and manufacturing to assembly, testing, packing, and shipping, our professionals will be at your side every step of the way.

You will quickly see the benefits of working with PCB Runner for your PCB fabrication and assembly since they are a one-stop shop, saving you the trouble of contacting multiple businesses to finish your project.

Our Proficiency

  • PCB Panels
  • Layer Stackup, Blind, and Buried
  • Lead-Free
  • Soldering Through Laser
  • Micro Via
  • via in Pad

Full-featured PCB Manufacturing and Assembly Capabilities are offered by  PCB Runner

  • Stiff PCBs
  • Flexible PCBs
  • PCBs that are rigid-flexible
  • PCBs using High Density Interconnect (HDI)
  • PCBs with many layers

Read More: Harnessing the Power of Effective PCB Routing: Strategies, Best Practices, and Future Trends

Base Materials for PCBs

What we can offer you is:

  • PCBs at High Temperatures
  • PCBs that comply with RoHS regulations
  • PCBs with High-Frequency RF
  • Fast Digital PCBs
  • Prototype PCB Assembly, PCB Services, and PCB Assembly
  • Sources for Components: Low Volume, High Volume, Partial Turnkey, and Full Turnkey PCB Assembly

PCB Runner offers custom Blind & buried via PCB manufacturing for all industries and critical design requirements. Our highly experienced engineers are there to point out critical manufacturing issues by performing DFM & DFA twice. Please submit your Gerber/ODB++ files to our email at sales@pcbrunner.com or engineering@pcbrunner.com