HDI PCB and Microvias

The Use of Microvias in HDI PCB

  • New

In recent years, the use of microvias in HDI PCB design has increased dramatically. The main advantage of using a microvias is that it provides an easy and cost-effective way for transmitting routing signals from one side of a PCB to another, without having to add any extra layers. This helps reduce the manufacturing costs as well as makes it easier for designers to route their signal lines.

In this blog post, we will go over what microvias are, how they work, and why you should include them when designing your next project.

What are Microvias?

Microvias are tiny holes through a printed circuit board that allow for the passage of small signals, typically from one layer to another. They can be around 0.030 inches in diameter and used as an effective means of signal routing or with more expensive boards. Additionally, they may also be used to provide power distribution connections.

Microvia technology is most often seen in high density designs like those for cellular phones and laptops, but its used is also in many other devices, such as medical and military equipment, and other industrial uses where signal integrity is critical.

Microvia openings are created by punching a hole through the PCB with a laser beam, which then melts away some copper on either side of the opening, leaving only enough material for reliable electrical connection between layers. This allows for less material use.

Designers are taking advantage of the latest printing technology by utilizing HDI techniques to create more durable products with smaller designs. The use of microvias and other small structures allows for traces a designer might not have been able to do before in printed circuit design, which is crucial when it comes down to higher layer counts or high interconnect densities during manufacturing processes like PCBs.

Microvias are becoming more and more popular for systems that require multiple functions on a single circuit board. They offer innovative designs for engineers trying to save space, weight, and time to market. Designers are now realizing that in order to create more durable and smaller gadgets, they need to start taking advantage of microvias. They have been able to do this by using HDI design techniques, which allow traces from one layer on a PCB board to reach another higher density level with its many layers. This has made possible the repair of these small structures or components without any trouble, even if you lose some parts altogether.

Microvias And Its Types

Blind Microvias

Using Blind Microvias is a cost-effective way to connect your PCB layers and reduce its costs. While they don't go through all of the layers, they ensure that you have breakout channels in those bottom or inner layer connections.

Buried Microvias

Buried Microvias are buried inside the PCB and connect different layers together. They reduce the aspect ratio of a board by not extending to top or bottom, but can be used for routing traces on either side.

Stacked Microvias PCB

Stacked microvias are buried vias that have been stacked, providing additional connection points for the PCB. They can be used in any type of HDI board to connect multiple layers together and strengthen those connections by ensuring a strong contact between them.

Why Choose Microvias for PCB Manufacturing?

PCB manufacturing is expensive for a number of reasons. The most noticeable factor contributing to the expense is the PCB layers. Manufacturers use microvias as an option to reduce their prices by decreasing the layer numbers. This is much easier when compared to through-hole vias that require all holes be drilled separately on different sheets of copper before they're soldered together.

With the ever-increasing need for small-sized devices, highly functional devices, microvias have become one of the most useful ways to save money and improve electrical characteristics.

PCB microvias are the future of high density circuitry. From a manufacturing standpoint, these tiny holes can make circuit boards more compact and functional than ever before. The latest in PCB technology allows for up to three layers on one board while still maximizing space utilization by drilling through materials with ease thanks to these design breakthroughs.

Advantages of Using Microvias

Microvias are a great way to save on space and money. By placing the via directly in-pad, you can decrease wasted spaces between layers, which saves the board area costs. This also allows for better wire management with smaller traces as you are able to make connections more densely across different levels of the circuit board.

Microvias are the key to solving many of your design headaches. Traditional blind and buried vias can save you space but create difficult challenges for fabrication because they must be constructed layer by layer. Microvias, on the other hand, already exist as layers so all you need is a well-placed drill at each via’s location in order to complete the entire process.


There are many factors that contribute to the price of microvia PCB manufacturing. The most noticeable is layer numbers, with each additional layer adding a significant cost. Manufacturers can use microvias as an alternative method for reducing the number of layers and prices by decreasing their layer count.

Using microvias in printed circuit design can make it easier to route signals through the circuit board. If you're a manufacturer who is looking for ways to reduce the cost of PCBs, microvias may be your solution.

This manufacturing process can help decrease layer numbers by as much as 50%, which means less copper is used in each design and, therefore, lower costs.

It's important to note that this option will only work if all components are on one side of the board; otherwise, through-hole vias would have to be drilled separately and soldered together before they could be installed.


Copyright © 2024 Hemeixin Electronics Co, Ltd. All Rights Reserved.