Do you remember IBM Simon? You can consider it the father of smartphones. The Simon phone has 38 mm thickness and almost 510g weight. So it was impossible to place in the pocket. On the other hand, look at today’s smartphone. You can easily put them in your pocket. And the reduction in the size of a smartphone is due to the HDI PCB. The purpose of HDI technology is to make devices smaller, thinner, and lighter as well.
So do you want to learn HDI PCB? This article gives you a clear idea about what is HDI circuit boards. So we will cover its features, benefits, and applications, etc. After completing this article, you will be adept in the HDI PCBs.
What is HDI PCB
HDI PCB stands for High-Density Interconnector Printed Circuit Board. It is one of the significant enhancement in the world of PCB electronics. Moreover, its advanced multiple via processes minimizes the number of layers. So it provides smaller yet most powerful circuitry.
Features of HDI PCB
HDI PCB fabrication uses the latest multilayer technology that allows you to integrate multiple layers with high density. This technology has significant dominance over other traditional PCBs. Here are some key features of this technology:
- High-density interconnector uses laser drilling technology. So this technology precludes different drawbacks that occurred during traditional mechanical drilling technology. Therefore, it reduces your difficulties.
- These boards contain high wiring density per unit surface area as compared to regular PCBs.
- HDI boards most often come with apertures having a range of 3.0 to 6.0 mil. Moreover, the line width is between 3.0 and 4.0 mil. So by using these features, you can minimize the pad size significantly.
- Another most popular feature of these boards is vias. There are different types of vias such as buried, blind and micro vias. The size of the vias can be lesser than 0.0006 mm in diameter. So these small size vias help you to save more space on the boards. So you can create a more compact design.
- The effectiveness of these boards assists as a substitute to use of high-layer laminated boards. Moreover, these boards are expensive as well.
- Different characteristics such as lightweight and high frequency. Plus, high electrical speed makes it the ideal option for various applications.
Different stack-ups for HDI PCBs
According to the IPC-2315 standard from the IPC, there are 6 basic types of stack-ups. These stack-ups types include I, II, III, IV, V and VI. However, the last three types are more expensive and have minimum use. So we will only discuss the first three types of vias. Moreover, the standard differentiates HDI stack-ups on the basis of the vias type. Such as micro, buried, blind and plated through vias.
- HDI Type I: These types have a structure of a laminated core having at least just a single layer of micro vias. These vias can exist on one or both sides of the circuit. Type I HDI use blind and PTH vias. However, it doesn’t use buried vias.
- HDI Type II: This type includes different blind and buried vias on a laminated core. Fabricators can stagger different micro vias and stack them relative to buried vias.
- HDI Type III: To construct this type, the manufacturer uses micro vias, buried and blind vias on a laminated core. Moreover, this type includes at least two layers of micro vias on one side of the board or both. You can stagger micro vias over other micro vias. Furthermore, you can stack them over other buried vias.
Materials of HDI PCB Fabrication
Do you want to know about the different materials used in HDI PCB manufacturing? You should know about the different materials for various reasons. For example, if you know about the material, you can choose the right material for your HDI board. Let’s have a look at the most important material used for HDI:
- Copper: This is the primary material for all PCBs.
- Core: It is a skeleton of the board. It is a copper-clad board. You can use it for the double-panel production of the inner layer.
- Surface treatment materials: It includes nickel-gold alloy, lead-tin alloy, OSP, silver, etc.
- RCC: The specification of RCC includes 60T12, 60T18, 65T12, etc.
- FR4 (LDP): The specifications of FR4 include 1080 and 106.
If you want your PCB to perform well, you will have to choose adequate dielectric and resin material. The properties of these materials include decomposition temperature and glass transition. It further includes thermal expansion coefficient and delamination time.
For example, most of the people go with FR4 materials. You can use it for those applications that need a few GHz frequencies. In addition to this, if you want to pick materials used in microwave/ RF applications. You need materials that are capable to maintain impressive signal integrity. So choose a material that can is good for up to 20 GHz.
And other material includes BT epoxy, polyamide, and enhanced epoxy. You can pick any of them according to your needs!
Benefits of using HDI PCB Board
Using HDI circuit boards in your application has a lot of advantages. Due to these benefits, most manufacturers prefer HDI over other types of circuit boards. Have a look at the benefits of using HDI PCB in your applications:
Reduce heat transferring
Traditional PCBs burn due to a lack of heat transferring. So this technology has an edge over traditional circuitry such that it reduces heat transfer. Why? It is because the heat has to travel for a short distance before leaving the HDI PCB.
The design of this circuity makes it capable to go through a high thermal expansion. So it increases the lifespan of the circuit boards.
Manage thermal conductivity
The availability of different types of vias makes sure the current transmission between the components. So it is up to you to fill these vias with either conductive or non-conductive materials. You can further enhance the functionalities by using the blind vias and via in-pad components together.
Furthermore, the HDI boards have a compact structure. So it reduces the transmission distance between different components. It further reduces transmission times and crossing delays as well. So as a result, you will have a strong signal for your circuit.
Minimal power usage
HDI PCBs consume less battery power as compared to traditional ones. This is because of advanced manufacturing technology. This technology binds the electrical components resulting in minimizes loss of energy.
HDI circuits use vias instead of through holes that also reduce power usage. This effect increases the lifespan of your battery.
Smaller form factors
It is an ideal choice for saving space. You can easily minimize the total number of layers on HDI PCB designing. For example, you can replace the 8-layer through holes by using a 4-layer via in pad solution. As a result, you will have a small PCB. Some vias will not visible to the people and increase performance as well.
Incorporation of components
You can’t only minimize the space but also incorporate your boards as well. It means you can put as many details as you want on the HDI board. Furthermore, you can populate both sides of the board to incorporate the components. So this depends on the design and the need for the application.
By using the high-density interconnector technology, you can create different designs of the boards. So you can use these circuit boards in all applications as you want. Such as you can have rigid, flexible and combination of both.
How does HDI PCB change your lives?
HDI PCB is the fastest-growing part of different industries. Nowadays, devices are getting smarter and more portable. Furthermore, components insides the devices are smaller and lightweight. On the other hand, performance is getting higher and higher. In addition to this, performance works in smaller areas as well.
So all this happening just because of HDI circuits and other technologies similar to this. These circuits provide higher density per unit as compared to traditional circuit boards. This technology use buried, blind, and micro vias to uplift the performance. Besides, these vias provide high-quality results when combined with laser direct imaging and laser drilling machines.
Application of HDI PCBs
So far you have learned a lot of things about this amazing technology. However, you might be thinking that where you can apply these incredible circuit boards. So it is a fact that there are countless applications where you can use this board. Therefore, you can use this circuitry from simple to mega-complex applications. Here are some significant applications for HDI PCBs:
This term refers to all basic devices you find in your daily life usage. Such as laptops, smartphones, and cameras. Moreover, it also includes the majority of home appliances and entertainment systems.
All these gadgets need circuit boards having lighter weight. Moreover, these appliances also need flexibility. Thus, HDI circuitry meets the qualities of these gadgets.
There are numerous electronics playing a key role in the wellbeing of our health. So the medical industry wants to ensure the high-quality circuits that meet their standards. So all medical equipment should be effective and play a major role in the safety of the patient.
So there are several devices where you will find HDI printed circuit boards. Such as monitors and scanners. It further includes heart pacemakers, scientific instruments and control systems.
You can find this circuitry in high-powered industrial applications. Due to its effectiveness and robust nature. Moreover, it consumes less energy and ensures maximum output.
Even these circuit boards are capable to perform in a harsh environment. So most boards use thick copper that helps in faster battery charging. Moreover, it also helps in high current applications as well.
So you can find this circuitry in various applications. Such as electric drills and different measuring equipment. Besides this, they exist in power equipment such as generators and solar power panels.
Most automotive rely on different electronic parts to work properly. So you can use this technology in these applications. You can use high-frequency signals of RF and HDI PCBs combined with sensor applications. This is common in automotive.
Different technologies such as radar technology are clearing their way in the automobile industry. All such technologies rely on HDI circuitry.
In addition to this, some common applications such as engine management systems use this technology. It further includes navigation devices, video, and audio devices.
The precision and durability make HDI an ideal choice for aerospace applications. Moreover, HDI circuits can resist vibration effects. Airplane and jets need circuity that can withstand in harsh environments.
So HDI circuit boards ensure the security of aerospace applications. These apps include monitoring equipment such as pressure sensors. Plus, accelerometer.
The high-density interconnector circuit board is the most robust technology. You can use this technology in a wide number of applications. If you want to order high-quality PCB, you must be familiar with the basics of this technology.
So if you are looking for a reliable PCB, you can consult MOKO Technology. We utilize the latest technologies to create high-quality circuit boards.