HDI PCB – High Density Interconnect PCB

HDI PCB (High Density Interconnects PCB) are used to meet the market demand for complex designs in smaller form factors across the majority of market segments, (Wireless, Telecom, Military, Medical, Semiconductor, and Instrumentation).

What is HDI PCB ?

The HDI PCB is the short form of High-Density Interconnect Printed Circuit Boards.
It has been constructed by using HDI technology for a compact and reliable PCB design.

It characterizes the high-density attributes including laser micro vias, fine lines as well as the high performing materials.

The traditional PCBs are covered with copper throughout the inner and outer layers ,
Where as the HDI PCBs are incorporated with multi-layers of copper filled with stacked micro-vias.

It creates a structure enabling complex interconnections to provide necessary routing solutions.
The high tech applications are utilizing the advantages of the functional strategy of the HDI PCB to construct the large pin-count chips.

36 layers hdi pcb

36 layers , 2 steps  HDI PCB , material : ShengYing S1000-2
Application: Chip TEST board

Structural definition of HDI PCB

The higher circuitry density is the main reason behind its naming.

The HDI PCB is designed with typically smaller vias and capture pads, finer lines and specs, and high connectivity of pad density.

The combination of the fine track and gap features with the laser-drilled blind allows the interconnection with one PCB layer to the other using the smallest pad diameter.

The HDI boards include a blind and buried vias in size of 0.004 diameters for the micro-vias.
It creates greater flexibility in the architecture of the HDI PCB by the utilization of increased efficiency.

The HDI PCB consists of 1 or more than 1 “build-up” of high-density interconnection layers staggered or stacked micro vias on different layers.

All the layers of this PCB enable the conductors on any layer of the PCB to be interconnected freely with copper filled stacked micro-vias structures.
It creates a reliable interconnection solution for highly complex large-pin count devices such as CPU and GPU chips to improve the portable devices.

By utilizing the HDI technology, the designers are now able to place smaller components closely for faster transmission of signals. This helps in a significant reduction in loss of signals and crossing delays.

Using this HDI PCB will enhance the functioning improving:

  • Dense trace routing
  • Extended power stabilization
  • Reduced interference effects into the inductance and capacitance
  • Improved signaling integrity for the high-speed applications
  • Decreases frequent relocating the components

Increases the space for the other components

Andwin maintains years of experience with HDI products and was a pioneer of second generation microvias. now offer an entire family of microvia technology solutions for your next generation products.

6 layers hdi pcb

6 layers , 2 steps  HDI PCB (2 + 2 + 2 ) ,BGA 0.18mm, material : ITEQ IT180A
Half plating holes
Application: wireless communication module

Feature of HDI PCB

The HDI is an efficient and durable solution for creating high-functioning applications in a lighter and smaller format. Along with all the improved functionality in smaller consumer products, denser BGA, and QFP packages it lowers the heat transfer induced by stress. The following features reflect the working process of HDI PCB in the applications:

  • The HDI PCB can get populated from both sides of the board and incorporate the components onto smaller boards.
  • It decreases the power consumption and leads to having longer stand-by facility into the handheld and other battery-powered devices.
  • It comes in a well-built and rugged format to provide strength and limited perforations.
  • The reduced thermal degradation extends the endurance of the device.
  • The device can have higher density transmission and computational features using a smaller space.
  • The HDI PCB uses and accommodates with sustainable and dense BGA and QFP packages in PCB technology design to create smaller devices based on the user’s demand. It can be smartphones, aerospace equipment, medical applications, or military devices.

It enhances reliability in transmission whereas the PCB design gets into the point of mass production.

 Benefits of HDI PCB

By the evolution of high-density PCB technology, the engineers are having enough freedom and flexibility in designing the applications according to consumer demands. They get space to place the components on both sides of the raw PCB. It consists of the following key benefits:

  • Concentrated Transfer of Heat:The transfer of heat is reduced due to the close placement of the components. The thermal expansion in HDI PCB also endures less stress and extends endurance.
  • Conductivity Management:The vias in HDI PCB can be filled with conductive or non-conductive materials. It can facilitate the transmission among the components and can customize according to the board design.
  • Improved functionality:By using HDI PCB the functionality is improved as the blind vias and via-in-pad enables the components to be placed closely. It increases the signal strength whereas the transmission range and the delay for transmitting time become less.
  • Smaller Form Factors:The HDI PCB is better for saving space and the number of layers can be reduced without compromising the efficiency, and durability as well as the design of the application device.
  • Non-conventional HDI Boards:The HDI boards contain thinner lines, tighter spacing, and tighter annular ring using the thinner specialty materials. For successful production of these boards right amount of time, investment, and manufacturing process.
12 layers anylayers hdi pcb

12 layers anylayers hdi pcb , material : ITEQ IT180A
Application: communication

 Applications of HDI PCB

HDI PCB is a complete solution to be used in a wide range of industries. The efficiency is the key to these industries into certain types of applications and HDI PCB is perfect for that. The following applications can be beneficial to use HDI PCB into the system:

The medical industries require high definition application devices and HDI PCB has a great impact on that. Medical devices work with the small package with high transmission rates. HDI PCB fits into all sorts of medical devices that are used for implants, labs, or imaging equipment making these devices more space-saving and cost-effective.

The HDI PCB can be used in small size cameras to observe the inner parts of the patients.
It makes sure the picture quality remains the same and accommodates the advancements.
Even some implants have to be small enough to fit inside of the human body with high signaling transmission rate and HDI PCB is just appropriate.
This also can be used in other medical equipment like emergency room monitors, CT scans, etc.

The military and defense applications require having highly efficient and durable PCB. When certain devices are paired with high-density interconnected PCB that can even make it smaller in size can be a plus. The HDI PCB can be incorporated in military applications especially into the communication devices and other strategic equipment such as missile and defense items.

The applications used in aerospace work in an extremely rugged environment and need to ensure endurance for long term usage.
The HDI PCB can work properly under hazardous conditions which is ideal for aerospace applications.

The automobile manufacturing industries work with certain types of applications that have a high demand for smaller PCBs.
It can be a great help to save more space within the car.
With HDI PCB the cars can be programmed with some other exciting features like onboard GPS, Wi-Fi, backup sensors, rearview mirrors, and so on.
Up to 10 layers of HDI are available with high demand in the market that can even introduce with futuristic cars.
Such integration of electronic devices offers a better driving experience which is the key focus to the carmakers.

  • Other main applications of HDI PCB

Electronic Devices:
HDI PCB has made it possible to create innovative gadgets from huge computers to laptops.
It is appropriate for multiple electronic devices like smartphones and tablets along with the wearable devices VR headsets or Bluetooth headphones.
The prime idea for these applications is miniaturization and the highest level of efficiency.
For smartphones, Every Layer Interconnection/ELIC type HDI PCB is required to make the devices thinner, smaller, and more portable.
Now it is also used in refrigerators, smart TVs, thermostats, etc.

The modern devices have the tendency to become thinner and smaller and PCBs are the major requirement.
The HDI PCBs come with benefits to amplify the functionality of circuit boards.
The development in the board technology makes it space-saving assisting the superiority of gadgets and other application devices.

The interconnected HDI PCB has been launched with the ability to provide the ultimate results to the faster signal transmission with enhanced signaling quality. It enhances the electrical performance of the device such as mobile phones, touch screen devices, laptop computers, digital cameras, 4G network communications as well as the prominently featured applications used in medical, aircraft, military, and so on.

Stack up of HDI PCB

Stack up of 1  Step HDI PCB

1 step HDI that need one lamination process,
the most like common PCB board,
after lamination ,laser drill out layer to sub out layer.

HDI PCB stack up 4 layers 1 step

Stack up of 2 step HDI PCB

2 step HDI , it need twice lamination process with blind buried hole,
for example,a 6 Layers HDI PCB ,
first time, laminate L2 to L4 layer board ,
then laser drill L2-L3 or/and L4-L5,
and then finish other process.

HDI PCB stack up 6 layers 2 steps

HDI PCB stack up 6 layers 2 steps

Stack up of  3 steps HDI with blind via and buried via

3 or 4 step HDI process is similarly 1 or 2 steps ,
only differenci is that need more times lamination.

HDI PCB stack up 10 layers 2 steps with burried vias

Anylayer connect of HDI PCB

This type HDI PCB , need to adjust lamination stack up as normal symmetrical by our Engineer ,
but do not affect the orignal eletronical connect.
it is complex , depend on the orignal design of PCB.


HDI PCB Sample

8 Layers HDI PCB

Application:  Pad
Layers: 8
Stack: 1+6+1
Thickness: 1.6 mm
Min.track Space/width: 4mil /4mill
Min. CNC Via size: 0.2mm
Laser drill : 0.1mm

HDI pcb

HDI pcb

Andwin Circuits Co.,Limited
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