- HDI stands for High-Density Interconnect. In other words, a PCB with about 120 – 160 pins per square inch is an HDI PCB.
- The HDI PCB comes with multiple numbers of interconnections enclosed within a small space. So, it results in the reduction of a circuit board.
- HDI made the microvia technology famous and it’s perfectly ideal for blind vias, microvias, and buried vias.
What Is an HDI PCB?
The HDI application is one of the fastest-growing technologies today. HDI PCB’s stands for High-Density Interconnect Printed Circuit Boards. So, it results in the reduction of a circuit board. Moreover, there’s little space between the PCB components, making the board space smaller—although the board functionally isn’t affected.
In other words, a PCB with about 120 – 160 pins per square inch is an HDI PCB. So, the design of the HDI integrates versatile routing and density component placement. Also, it’s essential to know that HDI made the microvia technology famous and it’s perfectly ideal for blind vias, microvias, and buried vias.
The 3 Ways to Designing a
Successful HDI PCB
There are three key ways to design HDI PCB with success.
And they are as follows:
1. Manufacturing Process
You can’t successfully build an HDI PCB without knowing the aperture ratio you intend to use for its fabrication.
However, a general rule of thumb is using a smaller aperture for a thicker board and vice-versa.
Generally, the HDI PCB layouts have a high density. Hence, it’s necessary to ensure their maintainability, solderability, and instability.
HDI PCB manufacturing capabilities
(Up to 32 Layers)
Number of Layers :1 - 32 layers
Time of Production:1 day - 4 weeks
Quality Grade:Standard IPC 2
Order Quantity:1pc - 10000+pcs
Copper Weight (Finished):6oz/10oz
Board Size:Min 50*50mm | Max 450*406mm
Material:FR4 standard Tg 140°C,FR4 High Tg 170°C, FR4 and Rogers combined lamination
Board Thickness:0.2mm - 10mm
Silkscreen Color:White, Black, Yellow
Solder Mask Color:Green, Black, Blue,White, Red, Yellow
Solder Mask Sides:As per the file
Silkscreen Sides:As per the file
Max Exponents of Blind/Buried Vias:Stacked vias for 3 layers interconnected, staggered vias for 4 layers interconnected
Min Annular Ring:4mil, 3mil - laser drill
Other Methods:Flex-rigid combination Via In Pad Buried Capacitor (only for Prototype PCB total area ≤1m²)
Surface Finish:HASL- Hot Air Solder Leveling Lead Free HASL - RoHS ENIG - Electroless Nickel/Immersion Gold - RoHS Immersion Silver - RoHS Immersion Tin - RoHS OSP - Organic Solderability Preservatives - RoHS
Min Drilling Hole Diameter:6mil, 4mil - laser drill
The Different Types of
HDI Printed Circuit Boards Structures
We’re also capable of fabricating up to 32 layers of HDI PCB. So, it all depends on your specific demands. Below, is the table showing the type of HDI PCB structures we create.
|HDI PCB Structures||The Various categories of |
|Large-Scale Production||Small to Medium-Scale |
|1+N+1||Blind vias||Yes||Yes||Yes||Over 4 layers|
|2+N+2||Blind/Buried staggered vias||Yes||Yes||Yes||Over 6 layers|
|2+N+2||Blind/Buried stacked vias||Yes||Yes||Yes||Over 6 layers|
|3+N+3||Blind/Buried stacked vias||/||Yes||Yes||Over 8 layers|
|3+N+3||Blind/Buried stacked vias||/||/||Yes||Over 8 layers|
What Are the Benefits of
using HDI PCB?
–The benefits of HDI PCB are as follows:
What is the Future for HDI PCB?
From the look of things, HDI PCBs are creating a lot of possibilities in a wide range of industries. And it can only develop as time passes.
So, it’s a technology that you should consider—especially if you need something that will save you time and boost your efficiency. Plus, the demand for the HDI PCB increases regularly. So, we can tell that it’s promising.
Are you interested in getting more information about HDI PCB?
What Is the Difference between
Standard and HDI PCBs?
The standard PCBs use through-holes. So, they have a high stray capacitance and a colossal discontinuity in impedance. In other words, standard PCBs have decent signal integrity performance.
But, the HDI uses buried vias and small blind. Hence, it decreases the stray inductances and capacitances. Plus, it offers excellent signal integrity performance. Other vital differences between the standard and HDI PCB include:
Through-Hole PCB (Standard):HDI PCB
It has a lower component density per square inch:HDI has a higher component density per square inch compared to standard PCBs
Uses mechanical drilling:HDI uses direct laser drilling
Standard PCBs have heavier and larger boards:It has lighter and smaller boards with increased functionality
Comes with a high number of layers:Features a low number of layers
Standard PCBs use through-holes:HDIs use microvias, blind, and buried vias
When paired with low pitch packages, it faces a few compatibility problems:It works perfectly with low pitch packages and high pin count
HDI PCB Application
1. What services do you offer?
Three basic PCB assembly services are offered, including PCB Fabrication, Consigned PCB Assembly, and Full Turnkey Service.
2. Is it possible to get stack-up drawings from you?
Yes, we have shared some of our standard stack-up drawings with you or even individual stack-up drawings meeting your special requirements.
3. Do you offer any discounts?
Our two factories have price support for different orders, especially multilayer boards and mass production.
4. No, we generally work on the basis of the Gerber file.
No, we generally work on the basis of the Gerber file.
5. What if I am dissatisfied with PCBs from WELLPCB.com?
If you find any defects with the PCBs delivered, or if you feel dissatisfied with our products or services, please immediately let us know via [email protected], and we will respond within 24 hours. We will serve you until you are fully satisfied. We will either re-fabricate your PCB in case of a defect or refund the full amount without needing to return the defective PCBs. You may also choose to credit your WELLPCB.com account and use the credit for future orders.
6. What else to consider when manufacturing High-Density boards(HDI PCBs)?
Besides what we have covered above, it is also essential to consider the electrical performance, such as electrical connection, connection pad density, density per unit, etc. For more questions, you are welcome to contact our team.