High-Density Interconnect (HDI) printed circuit boards are an advanced design of circuit board, designed to support significantly higher wiring density per unit area than standard PCBs. HDI boards use microvias, fine traces and high layer counts to make electronic devices smaller, lighter and more powerful.
HDI PCB technology is now widely used in smartphones, medical devices, automotive electronics and aerospace systems, as it can deliver the miniaturisation and signal integrity demanded by these applications.
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What is a HDI PCB?
A circuit board that has more wire per unit area than a typical board is referred to as an HDI PCB. The design may use thinner lines and gaps, smaller vias and capture pads, and greater connection pad densities since HDI PCBs have a higher circuit density.
- HDI PCBs often have microtias with a diameter of 0.006 or less, as well as blind and buried vias. They also have finer gaps and lines.
- The use of smaller pads and tighter spacing in HDI PCB board means that the precision of component placement and the accuracy of assembly processes must be greater than in standard PCB designs. Commonly used leadless packages include ball grid arrays (BGAs), chip scale packages (CSPs) and quad flat no-lead packages (QFNs).
- The HDI PCB circuitry is thinner and lighter, therefore the PCBs may fit into tighter locations and have less mass than traditional PCB designs. The lower size and weight indicate that there is less risk of injury from mechanical shocks.
Benefits Of Using HDI Technology
Your device’s overall enactment can be considerably improved by using an HDI rather than a regular PCB.
Enhanced Reliability
The dependability of your board and your goods can be increased by the reduced aspect ratios and the premium micro via structure.
Smaller Size and Lower Weight
The ability to secure more components on both sides of the bare PCB using HDI boards enables you to squeeze more functionality into a smaller area and increase the equipment’s overall capabilities. You may increase functionality while making your goods smaller and lighter thanks to HDI technology.
Improved Electrical Performance
An increase in the number of transistors and a reduction in the distance between components can result in better electrical performance. Microvia technology enables circuit board designers to reduce radio frequency interference and electromagnetic wave interference by shortening the distance between the ground layer and the signal layer. Lower power consumption is made possible by these qualities, which enhances signal integrity.
Increased Cost-Effectiveness
HDI boards can be more economical than other solutions with careful design and production since they use less raw materials because of their compact size and few required layers. You might be able to employ one HDI board for a product that previously would have needed several conventional PCBs. More functionality and value may be obtained with a smaller footprint and less material.
Faster Production Times
Faster manufacturing speeds and a quicker time to market can result from the capacity to utilize less resources, and even fewer boards, in combination with design savings tied to HDI technology. Due to the superior electrical performance and relatively simple component placement, HDI PCBs require less time to test and debug.
Process of HDI PCB Manufacturing
Although HDI PCB manufacturing is similar to standard PCB production, it involves greater precision and more advanced processes. When dependability needs are taken into account, DFM requirements also become significant.
The details of HDI PCB fabrication are provided as follows:
- Photoresist Deposition and Exposure: This is used to specify the places that will be etched, leaving a pattern of conductors remaining on the laminate.
- Etching And Cleaning: A solution to ferric chloride serves as the industry standard etchant at the moment. The resultant conductor design may be cleaned after etching, and any residual photoresist can be recovered.
- Via Formation and Drilling: Mechanical or laser drilling must be used to define the vias. The through holes can be eliminated chemically for increased via density.
- Via Metallization: Vias are metallized to provide a continuous conductive link after being defined.
- Build-Up: Before treating the outer layer, layers are piled over several cycles of lamination.
Although HDI PCB processing techniques are more complex than conventional rigid PCB processing procedures, they nonetheless employ the same manufacturing data as a standard rigid PCB. Deliverables for your manufacturer should be ready after your HDI PCB design is done and has passed a DFM review.
Applications Of HDI PCB
One of the areas of the printed circuit board industry with the quickest growth is HDI PCBs.
Healthcare
Since HDIs are compact and easily fit in implants and imaging equipment, they are being incorporated into the majority of medical devices like:
- Implantable devices (e.g., pacemakers)
- Diagnostic imaging equipment
- Endoscopy and monitoring systems
Automotive Industry
Manufacturers of automobiles and other vehicles are drawn to HDI PCBs because they enable a great deal of creativity. With HDI PCBs, you may boost a vehicle’s performance while saving more room. They’are used in:
- Battery management systems
- ADAS modules
- Infotainment and dashboard electronics
Digital Devices
Compare modern digital gadgets like cellphones to their predecessors from 5 years ago. Both the size and weight will be noticeably different. HDI PCBs used in ELIC (Every Layer Interconnection) fabrication allowed for this transition.
High-density interconnect PCBs are responsible for the creation of innovative products like smartwatches and thinner, more portable electronics. To cram the newest features into a tiny gadget, HDI PCB technology is also used in fitness bands and VR headsets.
Aerospace and Military
Due to HDI’s market-leading versatility, strategic equipment like missile and defense communication systems uses it. In this industry, a little PCB is present in every device to carry out some function. Other forms of communication, such as mobile phones, trackers, and cameras, are getting smaller and some have up to ten layers of HDI structure.
Pricing Factors of a HDI PCB Board
So now you are aware of several key areas where HDI PCBs excel. However, while making your budget, it’s still essential to consider its prices. Some of the primary elements that affect HDI PCB’s price are listed below:
- Number of Layers: The pricing will vary depending on the number of layers and the kind of stickups you need. For instance, 2-n-2 HDI board layouts are more expensive than 1-n-1 versions because they are more complicated.
- Materials: Regarding the kind of HDI PCB materials, you have many of options. Depending on how your board will be used, you can pick from fiberglass, metal, FR4, or other materials; your ultimate pricing will vary accordingly.
- Surface Treatments: Some options for surface treatments are immersion tin, immersion silver, HASL, ENIG, gold, and immersion tin. Because of its flatness and solderability, ENIG is used in the majority of HDIs.
Why Choose ELEPCB as Your Partner
ELEPCB is a leading PCB manufacturer known for its high-quality HDI (High-Density Interconnect) PCB Manufacturing Service. Our HDI PCB Manufacturing Service offers exceptional density and miniaturization, enabling you to optimize space utilization and enhance the performance of your electronic products.
ELE HDI PCB Capability
| Type | Rigid, Flexible, Rigid-Flexible |
| Material | FR4, CEM1, CEM3, Aluminum, High Frequency Board |
| Layer | 1, 2, 4, 6 … 24Layers |
| Shape | Rectangular, Round, Slots, Cutouts, Complex, Irregular |
| Cutting | Shear, V-score, Tab-routed |
| Board Thickness | 0.2-4mm, regular 1.6mm |
| Copper Thickness | 0.5-4oz, regular 1oz |
| Solder Mask | Green, Red, Blue, Yellow, etc. |
| Silk Screen | White, Black, etc. |
| Silk Screen Min Line Width | 0.006″ or 0.15mm |
| Min Trace/Gap | 0.1mm or 4mils |
| Min Drill Hole Diameter | 0.01″, 0.25mm or 10mils |
| Surface Finish | HASL, ENIG, OSP, etc. |
Key Features of ELEPCB's HDI PCB Manufacturing Service
Advanced HDI Technology: We leverage the latest HDI manufacturing technology to produce PCBs with multiple layers, microvias, and fine-pitch components.
Design Flexibility: We offers various HDI design options, including stacked microvias, buried vias, blind vias, and sequential lamination, allowing you to optimize your PCB layout and achieve the desired performance and functionality.
Miniaturization and Increased Signal Integrity: With our HDI PCB Manufacturing Service, you can achieve significant miniaturization while maintaining excellent signal integrity.
High-Quality Standards: ELEPCB is committed to delivering HDI PCBs of the highest quality. Our manufacturing processes undergo rigorous quality control measures at every stage, from initial design review to final inspection. We adhere to industry standards and use reliable materials to ensure the reliability and durability of our HDI PCBs.
Timely Delivery: Our HDI PCB Manufacturing Service focuses on efficiency and promptness, ensuring that your HDI PCBs are manufactured and delivered within the agreed-upon timeframe.
Dedicated Customer Support: At ELEPCB, we prioritize customer satisfaction. Our dedicated support team is available to assist you throughout the HDI PCB manufacturing process, providing guidance, addressing your queries, and ensuring a smooth and seamless experience.
Prototyping printed circuit boards (PCBs) is a useful technique for designers since it helps save time and money while guaranteeing a high-quality result. Get in touch with ELE PCB right away if you need PCB prototype services for an upcoming venture.
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