HDI stands for high-density interconnects. In other words, a PCB with approximately 120 – 160 pins per square inch is an HDI PCB. The HDI PCB has multiple interconnects enclosed in a small space. Therefore, it leads to the reduction of circuit boards. HDI makes microporous technology famous all over the world. It is very suitable for blind holes, micropores and buried holes.
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WHAT IS HDI PCB?
HDI application is one of the fastest developing technologies today. HDI PCB stands for high-density interconnection printed circuit board. Therefore, it leads to the reduction of circuit boards. In addition, the space between PCB components is very small, making the circuit board space smaller - although the function of the circuit board is not affected.
Three key methods to successfully design HDI PCB. They are as follows:
THREE METHODS OF DESIGN A SUCCESSFUL HDI PCB
1. Manufacturing process
Before starting HDI PCB design, you need to understand HDI manufacturing process parameters first. To do this, you need to consider three factors:
◈ Aperture Ratio
If you do not know the aperture ratio to be used for manufacturing, you cannot successfully build HDI PCB. However, the general rule of thumb is to use smaller apertures for thicker boards, and vice versa.
The stack of HDI PCB must be classified according to blind hole and sequence. Therefore, the stack has four different categories; Non laminated 2-HDI (with buried holes), laminated 1-HDI (with buried holes), laminated and resin filled 2-HDI, and laminated and non resin filled 2-HDI.
◈ Technological process
There are some processes. But the main ones are four layers of HDI stacked in one layer and six layers of HDI stacked in two layers. These processes are somewhat similar to the standard PCB process for drilling sequencing.
Typically, HDI PCB layouts have high density. Therefore, it is necessary to ensure their maintainability, weldability and instability.
You must consider the tracking process, including the consistency of the tracking, the minimum line width, and the adjustment of the safety spacing.
HDI PCB MANUFACTURING CAPABILITY
(32 LAYERS AT MOST)
Number of layer
1 - 32
1 day - 4 weeks
Standard IPC 2
1pc - 10000+pcs
Copper weight (finished product)
6 oz/10 oz
Minimum 50 * 50mm | maximum 450 * 406mm
FR4 standard Tg 140 ° C, FR4 high Tg 170 ° C, FR4 and Rogers composite laminate
0.2mm - 10mm
Silk screen color
White, black, yellow
Color of solder mask
Green, black, blue, white, red, yellow
Solder resistance layer
According to the file
Silk screen surface
According to the file
Maximum index of blind hole/buried hole
3-layer stacked via interconnection, 4-layer staggered via interconnection
4mil, 3mil - laser drilling
Rigid flexible combination Via In Pad Buried Capacitor (only applicable to Prototype PCB total area ≤ 1m ²）
HASL - hot air leveling lead-free HASL - RoHS ENIG - electroless nickel plating/gold deposition - RoHS silver deposition - RoHS tin deposition - RoHS OSP - organic solderability preservative - RoHS
Minimum drilling diameter
6mil, 4mil - laser drilling
THE ADVANTAGES OF HDI PCB ARE AS FOLLOWS:
◈ Better signal accuracy
Because HDI integrates blind hole technology and holes in pads, it helps to put PCB components together without shortening the signal path length. Therefore, high-density PCB has faster signal transmission speed without too much signal loss. In addition, HDI technology eliminates the need to pass stubs. Therefore, it limits signal reflection and improves signal quality.
◈ Economical and practical
A standard 8-layer PCB can be reduced to 6-layer PCB without reducing the quality level. By doing so, you will save a few dollars.
◈ Compact Design
Hole grouping, such as micro holes, blind holes and buried holes, reduces the space requirements for circuit boards.
◈ High reliability
Due to the super shielding and the integration of stacked vias, HDI boards are highly resistant to extreme environmental conditions.
◈ Exceptional adaptability
HDI boards are suitable for boards that focus on space, weight, performance and reliability.
DIFFERENT TYPES HDI PCB STRUCTURE
We can also manufacture up to 32 layers of HDI PCB. So, it all depends on your specific requirements. The following table shows the types of HDI PCB structures we created.
WHAT IS THE FUTURE OF HDI PCB?
From the appearance, HDI PCB is creating many possibilities for all walks of life. It can only develop over time.
Therefore, this is a technology you should consider -- especially if you need some technology that can save time and improve efficiency. In addition, the demand for HDI PCB increases regularly. Therefore, we can say that it is very promising. Are you interested in learning more about HDI PCB?
The standard PCB uses through holes. Therefore, they have high stray capacitance and huge impedance discontinuity. In other words, standard PCB has good signal integrity performance.
However, HDI uses buried holes and small blinds. Therefore, it reduces stray inductance and capacitance. In addition, it provides excellent signal integrity performance. Other important differences between standard and HDI PCB include:
● Through hole PCB (standard): low component density per square inch
◈ HDI PCB application
● Automobile industry
Technology drives the automotive industry towards several goals.
They help improve the driving experience and save vehicle space. That said, it is not surprising that manufacturers insist on using small PCB (HDI) to achieve this goal.
● Healthcare sector
HDI PCB reveals many possibilities in the medical field. After all, the human development index plays an important role in diagnosing diseases. A good example of a medical device or device that uses HDI is a pacemaker.
● Consumer Electronics Industry
Your consumer devices are actually part of you. Therefore, whether it's your VR headset, tablet (touch screen device), smart watch (wearable technology), personal computer/laptop (laptop), entertainment system, smart phone (mobile device) or household appliances, all these gadgets have an HDI. In addition, HDI is responsible for the outstanding functions you enjoy from your electronic devices. In addition, HDI PCB promotes portability. For example, HDI PCB helps to produce compact electronic products. However, as a manufacturer, it is important to observe the regulations carefully. In this way, you will avoid creating designs that affect the quality of the equipment.
Except that HDI PCB can withstand extreme conditions, they consume less energy. When this happens, it produces the maximum output. This is why this kind of PCB is very useful in industry. You can find HDI PCB in industrial equipment such as electric drill.
We are confident to say that our customization service is outsatnding.