The Ultimate Microvia PCB Manufacturer You Can Trust in China

Rely on PCBMAY for Your Microvia PCB Orders

We understand the complex requirements the manufacture of Microvia PCB demands. Not only are exact measurements involved, systematic ways of improving the PBC fabrication process should be in place. We have shown you in our video above how we take care of these important aspects.

As for the Microvia PCB products we have, we assure you we are trustworthy–worth every dollar you spend. Our Microvia PCBs:

• Have the correct hole depth to hole diameter ratio (1:1)
• Use the correct size (15 mm and below)
• Conform to IPC standards
• Are highly heat resistant
• Simplifies routing traces

As you can see, the Microvia PCBs PCBMay manufactures are the best in class. We use superb PCB materials but we are affordable. We are able to quickly process orders without delay. We also give you feedback in case something is not quite to your liking. Our customer support staff are ready to take your calls 7 days a week, 24 hours a day. What’s more? Our staff is trained to speak clearly and respectfully, so we’ve got you’re your back!

Loyal customers who swear by our quality also ask for custom-made PCBs. Some of our customers already have PCB designs made, but some ask for our help too. Our highly qualified team of engineers can help if PCB design is one of your headaches. Our technical team can help with the design of Multilayer Microvia PCBs, HDI PCBs, 5G PCBs, and more. Any design of PCB you have, we can make it in bulk.

Indeed, what are you waiting for? Surely, we are your number one choice for PCB needs! Call PCBMay now!

Microvia PCB: The Complete FAQ Guide

Microvia PCBs are small circuits packed into tiny devices. The size of several electronic devices is reducing day by day yet the functionality of these devices is increasing rapidly. Microvia PCB makes it all possible to happen.

PCBMay is one of the most expanding manufacturing companies of Microvia PCB located in china. We have our group of experts and advanced technologies to provide the best quality of Microvia PCB.

This informative FAQ guide contains every nook and hook of Microvia PCBs. If you are eager to know about this type of PCB, just go through all of this FAQ guide.

What Is Microvia PCB?

Microvia PCB is a type of printed circuit board that uses Micro vias which is the smallest via to connect the layers in a multilayer PCB. Nowadays most PCBs are multilayer boards. Vias do connect the layers of the board to each other.

Microvia is of the size 150 microns or even less. The manufacturer drills the Microvias in a printed circuit board using the laser. Microvias are very small in diameter and connect a layer to the closest layer of the multilayer board.

Microvia PCB

As the manufacturer uses a laser to drill their vias, there are lesser chances of manufacturing defects. We can also avail more complex designs in our printed circuit boards using Microvias.

What Are The Types Of Microvia PCB?

There are three main types of Microvia PCB. You can use one of them individually or all of them combined for your printed circuit board in order to increase its density. The three Microvia PCB types are as follows.

● Blind Microvia

When the Microvia begins from the external layer and ends in an internal layer of the PCB, that is called blind Microvia. Blind Micro vias do not go through only outer layers. Applying blind Microvia to a PCB increases the wire density to a significant level.

Blind via is very beneficial in the type case of routing a signal from an external layer to an internal layer as it provides the least distance between them. Blind Microvias enhance the multilayer board space on an HDI board.

● Skip Microvia

Sometimes a Microvia goes through two whole layers. These types of vias are called skip vias. Though this type of vias are not recommended as they make the plating process difficult.

Types Of Microvia PCB

● Buried Microvia

The type of Microvia that connects two inner layers of a multilayer PCB is called buried Microvia. You can not see these vias from the outer layer of the board. Internal layers need to drill first in case of including buried vias in your PCB than the external layer.

Here any mechanical tool can be used to drill the Microvias on a PCB. But most manufacturers generally use a laser to drill the vias as they are very tiny in size. You need to consider the fact of hole size aspect ratio to apply the micro via to your printed circuit board.

What Are The Applications Of Microvia PCB?

There is a wide range of applications of Microvia PCB. Due to their smaller size and lighter weight, most industries use them for their applications, which are versatile and handy. In this era of technology, smart devices are so trendy and Microvia PCBs are perfect for these types of devices.

Microvia PCB Applications

As the days go by, the functionalities of these PCBs increase and do the applications. Many industries can not but use Microvia PCB. Some most common industries that have Microvia PCB applications are as follows.

• Consumer electronics
• Computer industry
• Home appliances
• Automotive industry
• Medical industry
• Agricultural industry

What Are The Advantages Of Microvia PCB?

We use Microvia PCBs because of their huge functionality, efficiency, reliability, and durability. Because of their huge benefits, the use of Microvia PCB is so large in the modern era. Some major advantages of Microvia PCBs are as follows.

● Cost-effective

If you require many layers in your PCB, Microvia PCB can be a solution for you for cost optimization. Replacing conventional through-hole vias with Microvias is a less costly option for printed circuit boards to connect the layers. You can as well as create complex circuitry using these Microvias for your PCB at a less cost.

● Minimum Space

Microvia PCB requires less space for placing all of its components. It basically uses the minimum space of the circuit board so there is a lot of space left. Microvia PCBs also consists of mostly two or three layers.

Microvia PCB Advantages

● Increased Functionality

Microvias used in a printed circuit board increase its functionality. They basically boost up the electrical features of the PCB. Multilayer printed circuit boards are so convenient in this technology era.

● Smaller Size

Microvia PCBs come in a very small size as the Microvias are tiny. They take a little space and build up the PCB. Small size printed circuit boards are perfect for smart devices that we use these days.

● Lightweight

Microvia PCBs are lightweight as well. As it comes in a small size, it usually comes in very lightweight which makes the smart devices very handy. We look for lightweight PCBs for our electrical devices in most cases.

● Wide Range Of Materials And Patterns

We can get Microvia PCBs in a wide range of materials and patterns that are perfect for complex circuit boards. For example, we can name via in pad, staggered, con-conductive, etc. Some other available PCB materials are copper-filled, offset, staked, etc, and many more.

● Built-in Thermal Regulation

The thermoregulation system is built in a Microvia PCB. The built-in thermal system provides a convenient operating system for PCBs. The routing can be boosted across the multiple layers in a Microvia PCB.

How Does Microvia PCB Work?

Nowadays with the up-gradation of technologies, computing and electronic industries are looking for reliable, smaller, and lighter electronic devices. Industries nowadays are looking for smaller and lighter appearances with functionalities. Still, functionality is very important for an electrical device.

We need the printed circuit boards to be light and small in order to make the device small and light. We can not build a smart device with a giant circuit board. Small and light circuit boards come in handy for smart devices for their size and low rate of battery consumption.

The small Microvia PCBs also produce less heat yet provide excellent performance. The excellent performance requires a complex routing mechanism to bring in the increased functionality.

Ball grid arrays work to have an increased number of outputs and input. For this reason, you increase the circuit traces when the inputs and outputs increase on the same board. To avoid this problem, we can utilize HDI technology with Microvias which is one of the many solutions.

A circuit board is able to carry more traces when you use many vias. It refers to that the different components possess a denser placement. We mainly use Microvia to have a denser printed circuit board.

Microvia PCBs are able to lessen manufacturing defects. We drill the Microvias using lasers that reduce the problem of having any residue. Microvia PCBs are so small in size and so they can easily connect the layers and thus a denser PCB is created with a complex design.

How Do You Design Microvia PCB?

There is the maximum wiring and pad density in a Microvia PCB in comparison to other types of PCB. The design also consists of small trace widths and small space. It is possible to make the most compact designs for this type of PCB.

The design is more reliable than many other PCBs as we use the laser to drill the holes. The manufacturer can drill the hole depths to 100 micrometers which is great. You will not have any problem regarding various expansions since it’s the short barrel.

Microvia PCB Design

Microvias are also perfect for complex circuit boards. Though there is a risk of voiding sometimes and so occurs the dimple. but you can easily avoid this problem by choosing the perfect solders for your PCB.

We can also avoid the risk of dimples by adding a Microvia filling process in the design. Though it will cost you some more. Watch the following video.

What Is The Fabrication Process Of Microvia PCB?

A Microvia possesses a diameter less than about 150 µm (6 mils). The manufacturer can either mechanically drill and plate them onto the PCB or can use a high-power laser depending on the via size. Mostly they use lasers as it is more convenient and hassle-free.

Then we constantly improve the circuit board. We get high volume PCB by high throughput in the fabrication process. By using advanced laser technology, the Microvias nowadays can be as tiny as 15 µm.

Microvia PCB Fabrication

As the manufacturer drills the holes and cleans them, then comes the via hole plating. The via hole can be plated with an electrolytic deposition, electroless copper plating, or sputtering process. The plating process helps to avoid void formation, bumps, dimples, or any type of structural defect in the buried via.

Laser-drilled Microvias are likely to have fewer manufacturing defects during the fabrication process. There can be defects in Mechanically-drilled Microvias as there happens drill vibration as the drill wears out.

What Are The Challenges Of Microvia PCB Fabrication?

There may come some challenges to fabricate a Microvia PCB. These difficulties need to be handled carefully or else there can be flaws in the board or even ICDs. ICD refers to interconnecting defects.

We can see these flaws close to the internal copper layers. We may face several problems like reliability issues, open circuits due to ICDs. ICD can also cause circuit failure since there may be discontinuity problems at very high temperatures.

Microvia Sizing

Detecting ICDs is another problematic procedure as they can not be detected in the testing process since they operate fine in the testing process. You need to detect these flows when designing it or after using it. You need to be very careful while fabricating the boards in order to not face problems furthermore.

Some common challenges of Microvia PCB fabrication are as follows.

• Copper-bond failure ICDs
• Voids and reliability
• Debris-based ICDs

What Are The Solderable Surface Finishes For Microvia PCB?

The final step of Microvia PCB is to finalize the surface finishes. The most common solder surfaces are ENIG ( Immersion Gold) and Immersion Tin for Microvia printed circuit boards. We can not use lead-free HAL or HAL in Microvia technology.

ENIG Surface Finish

The reason is the liquid solder can not fill up the Microvias with enough reliability. The imitations are for process reasons and then consequently in the PCB soldering process. As a result, the distribution to coating thickness (1 to 40 µm) is disadvantageous for the fine-pitch components.

How Many Currents Can A Microvia Carry In PCB?

Microvias have very low resistance so they can easily carry current in the PCB. You can also reduce the resistance of the Microvia PCB by filling the vias with suitable solder.

Microvia Current Flow

There is a rule of thumb for calculating the current carrying capacity of a Microvia PCB. The rule of thumb is  A Microvia correlates to a trace of width 4mil=0.1mm,  thickness 13um, and passes a current of 0.2A.

Watch this video about the current investigation in PCB via:

What Is Aspect Ratio In Microvia PCB?

Aspect ratio is a very crucial fact for Microvia PCBs. Aspect ratio is the ratio of the PCB thickness and the drilled hole diameter size. The bigger the aspect ratio gets, the more difficult it gets to have reliable plating.

Microvia Aspect Ratio

Microvias are likely to have a small aspect ratio compared to typical PCBs using through-hole vias. The aspect ratio of Microvias is preferably 0.75:1. With larger aspect ratios, there come reliability concerns and so they usually only stay between a single layer.

How Does Microvia HDI PCB Function?

Microvia technology and high-density interconnection boards are solely connected. We drill minute holes using a laser in order to establish an electrical connection among the layers of a multilayer PCB. Whereas normal Microvia PCBs can have four components, HDI Microvia PCB is able to carry six components in a defined area.

Microvia HDI PCB

Via in pad Microvias helps to miniaturize printed circuit boards. In these PCBs, we locate the Microvia hoes straight in the solder pads. The solder deposits the least hollow space since the Microvia is very tiny and has short blind holes.

Microvia high-density interconnection has a component layout with the tiniest BGA pitch. Using the via in-pad technology, miniaturization is possible as well. It also provides high wiring density as well as cost-effectiveness.

Microvia HDI PCB is highly reliable. As the components are getting smaller day by day, the technology is future-proof. Microvia HDI PCB possesses reduced capacitance and inductance effects.

How Does Microvia PCB Function In CAD Software?

You first need to define Microvia PCB design in a PCB stackup editor. Here you define the layer pairs as well as select the materials of the printed circuit board. You must choose the right laminate that supports your PCB fabrication process.

As you design the PCB stackup, the manufacturer should overview it in case there should be any changes. IPC slash sheets cover many HDI materials. In case any material of your design is not achievable, they should have replaceable materials that are compatible.

CAD Software

Decide on the layer pair designation carefully on the pad while designing the Microvia PCB stackup in the layout of the printed circuit board.

You can decide on the aspect ratio of the Microvias located on the printed circuit board by considering the hole diameter and the thickness of the dielectric layer together. The aspect ratio determines the reliability of the circuit board. You should be careful to size the structures of the Microvia PCB.

How Do You Control The Impedance Of Microvia PCB?

The impedance of Microvia PCB can be controlled through conductors. Here the electromagnetic waves spread at a fixed speed. This speed relies on the materials that you use in the PCB.

We can approximate the speed with a formula;  signal ≈ cLicht / √εr. For example, the speed for FR4 is cSignal ≈ 150.000 km/s.

Impedance Control

We can also apply the thumb formula rule as the speed is defined. If the length of the conductor is greater than λ / 10, the dimensional reliance of currents and voltage turns notable. We implement impedance matching to ignore these transmission faults.

We can understand the tracks of production-compatible conductors by Microvia’s use for impedance-matched processes. We as well as use Field Solver 8.0 from polar instruments to calculate the impedance. The PCB can also include a test coupon in order to control the impedance and evaluate it subsequently.

What Are The Disadvantages Of Microvia PCB?

Microvia PCBs have some limitations as well. Microvias are likely to face failure during filling, plating, prompting, assembly, and prompting. These limitations make the Microvia PCB a bit disadvantageous.

Microvia PCB Limitations

How Do You Test Microvia PCB?

You must test your Microvia PCB before installing it. There are different ways to test your Microvia PCB. Some of them are as follows.

• Standard statistical analysis
• Weibull analysis
• Interface separations
• Microvia barrel crack
• Microvia corner crack
• Microvia mis registration

Microvia PCB Testing Methods

What Are The Cost Considerations For Microvia PCB?

Microvia is tiny and we use Microvia to join high-density layers in multilayer PCBs. These Micro vias need to be 150 micrometers or less in diameter according to the IPC standards.

Microvia PCBs are convenient for creating compact circuit boards. But it needs to be mentioned that these boards are very costly sometimes because of different reasons.

Cost Consideration

One of the several reasons is they have compact designs as well as complex circuitry.

There is also a complex build-up process in the fabrication process. Micro vias used in the printed circuit boards can decrease the PCB cost in several situations. Some cases where you can decrease the overall PCB cost are as follows.

● Lessen Layer Count

If you use through-hole vias in your PCB and the trace escape does not function properly, then widen the breakout channel on the top and bottom layers. Also, widen it with the micro vias or blind vias.

● Remove Electrical Layers

Microvias are the tiniest in size that helps to increase the exposure of the routing channel. You can remove the electrical layers by establishing the Microvia at through-hole vias. Thus the cost of Microvia PCB reduces.

So we can say, we can reduce the layer count of Microvia PCB by removing the micro vias with through-hole vias. The printed circuit board costs less if it contains fewer layers.

How To Choose The Right Manufacturer Of Microvia PCB?

Choosing the right manufacturer of Microvia PCB is critical as the manufacturing and fabrication process is pretty dense. The right manufacturer should have advanced technologies for this fragile manufacturing process. Advanced laser technology should be provided to have a smooth Microvia PCB experience.

The manufacturer should have worked with your field of application before. They should have a group of experts for the manufacturing process.

The manufacturer should also possess international certificates for their products. Experience is another key factor. The manufacturer should as well as have advanced knowledge on Microvia PCBs.

If possible, pay a visit to the manufacturing area. Cleanliness should be highly maintained in the manufacturing process.

Conclusion

Microvia PCB is the miniaturization of higher functional PCBs with less space that are largely used in smart technologies. The features of Microvia PCB are getting enhanced as the days go by.

To know more about Microvia PCB and our services, contact us at any time. We are always here at your service.