How to Find a Fast Turn HDI PCB Manufacturer?

In the fiercely competitive electronics business, being first to market can mean the difference between success and failure. Engineers and product designers designing advanced applications rely on High-Density Interconnect (HDI) PCBs to provide the performance needed in a small size. Nonetheless, the intricacy of such boards frequently results in long production runs. Locating a trusted fast turn HDI PCB provider that can quickly bring high-quality prototypes and production runs to the table is a key challenge. In this article you will be introduced to the most important factors when choosing a fast turn HDI PCB manufacturer, the needful production technologies and the special product features of EFPCB.

HDI PCB Production Technology Complexity

To properly test a fast turn HDI PCB vendor, you need to know about the advanced processes used in manufacturing. HDI PCBs have finer lines and spaces, smaller vias and higher connection pad densities than traditional PCBs. This is accomplished with a few key technologies that a proficient fast turn HDI PCB provider must have.

Sequential Lamination
Instead of single pressing like ordinary PCBs, HDI PCBs are pressed in stages to form multiple layers. This step-by-step pressing process enables the fabrication of advanced layer constructions such as including buried and blind vias. Each lamination cycle increases time and complexity, so a quick turn HDI PCB manufacturer needs to have extremely efficient processes and enough press capacity to be able to handle these cycles at speed without sacrificing quality.

Laser Microvia Drilling
One of the key characteristics of HDI is microvia. These small holes are usually less than 150 microns in diameter and connect various layers of the board. Conventional mechanical drilling is not only unable to make such small holes, but also cannot achieve the same level of precision. Hence, a good speed turn HDI PCB provider takes advantage of state of the art laser drilling technology (CO2 or UV laser) to make microvias fast and with high accuracy. The speed and accuracy of laser drilling directly influence the total turnaround time.

Direct Imaging (DI) Lithography
For the line widths and spacing required with HDI, conventional optics based imaging is typically not adequate. DI is also referred to as Laser Direct Imaging (LDI). DI systems use a laser beam to expose directly the photoresist without using phototools (film artwork). This has the effect of not only improving the accuracy of the registration, but also greatly shortening the processing time, which is by any fast turn HDI PCB supplier must have.

The EFPCB Advantage in Fast Turn HDI Solutions

When assessing a prospective fast turn HDI PCB manufacturer, it is helpful to study the people that thrive on the edge of technology. EFPCB has made a name in this field, with a rare mix of high tech and quick reaction times.

EFPCB Product Characteristics and Capabilities

The product line makes EFPCB an ideal choice for meeting the most complex demands of the modern electronics. Their HDI solutions are defined by:

Ultra-Fine Lines and Spaces: EFPCB applies high end lithography and electroplating processes for pursuing line widths and spaces as small as 30um or less, with this high degree of miniaturization extremely high routing density is possible.
Complex Layer Structures: They have the capacity to produce extremely complex HDI boards based on any-layer HDI and layered microvias, which means you can create whatever design suit your inspiration.
Advanced Material Expertise: EFPCB processes a diverse array of high-performance materials, such as low-loss dielectrics for high-frequency use, and high-TG materials suitable for high thermal stability. 
Solution Integration: EFPCB outstanding among other companies in Rigid-flex HDI and embedded Part technology which can offer you integrated solutions that combines standard rigid HDI with embedded component technology that can save space and improve reliability. As a professional fast turn HDI PCB manufacturer, EFPCB is dedicated to providing the fastest service. This is thanks to simplified front-end engineering processes, 24/7 manufacturing facility, and expedited delivery options.

Review a fast turn HDI PCB Vendor

When you're in a rush, you need more than a manufacturer, you need a partner. DFM details here are some important factors you should consider when looking for a high quality fast turn HDI PCB vendor.

In-House Capabilities and Capacity
The most important security for speed is in house capability. A genuine fast turn HDI PCB manufacturer should have a complete in house manufacturing line for all critical processes such as laser drilling, sequential lamination, and direct imaging. Delegating any of these processes to suppliers inevitably causes delays and heightens the chance of quality issues. In addition, the vendor should be capable of running (several) an urgent order through without bottleneck.

Technical Expertise and Engineering Support
HDI design is notoriously difficult to get right, and mistakes can be expensive in both time and money. The result of a world-class fast turn HDI PCB supplier for solid DFM (Design for Manufacturability) will be as the following. Their engineers should be reviewing your design very early in the design cycle to catch potential manufacturability issues, and recommend enhancements. This early intervention eliminates production hold-ups and increases yield.

Quality Management Systems
Speed should not be at the cost of quality. A good quick turn HDI PCB manufacturer has to have rigorous quality assurance system. This includes high-tech inspection processes such as Automated Optical Inspection (AOI) for fine-line inner layers, and X-ray Inspection for multi-layer registration and also buried via integrity. Certifications like ISO 9001 and UL are/should be a bare minimum, and even better with industry related certifications such as AS9100 for aerospace, ISO 13485 for the medical.

Track Record and Responsiveness
Finally, find a vendor that has a track record of on-time deliveries for HDI boards. Ask for references or case studies. Responsiveness is also key. The best fast turn HDI PCB manufacturers will offer fast quotes and clean communication during the production process and even have policies in place to accommodate tightly your need.

Conclusion

Choosing a fast turn HDI PCB manufacturer is the most crucial for your speedy and high-tech electronic product to market. When you fully understand the complexities of HDI production technology, appreciate the advantages of advanced solutions (such as those from EFPCB) and you perform due diligence on prospective suppliers for in-house capabilities, technical expertise and quality systems, you can select a partner that can assist you in meeting your most demanding schedules without sacrificing performance or reliability.

Frequently Asked Questions for Fast Turn HDI PCB

What is considered a "fast turn” for an HDI PCB?
Turnaround time depends on complexity (layers, sequential laminations etc.), but a usual fast turn for moderate complexity HDI pcb can be 3-10 working days for prototypes. Typical lead times are 3–4 weeks or longer.

What is the importance of laser drilling for HDI PCBs?
Laser drilling is required since mechanical drills cannot drill holes thus small (microvias) for HDI patterns. Lasers also have the speed and precision to produce thousands of microvias correctly which is a critical capability for any Fast Turn HDI PCB supplier.

What is “any-layer” HDI? 
Any-layer HDI is a high order HDI technique in which microvias are drilled and stacked one atop another in any two layers of the PCB, which can reach the highest routing density and provide the greatest design flexibility. It needs customfication process and special skills.

How would buying DFM from the supplier save time?
DFM review is an engineering evaluation of your design prior to manufacture. A high-speed HDI PCB manufacturer that provides rapid turnaround for your projects can prevent these errors from snowballing into expensive redesigns and lost production time.

What are the inspection processes of HDI PCBs?
Automated Optical Inspection (AOI) is also important to detect fine line and space patterns on inner layers. X-ray inspection is necessary to confirm multi-layer registration and buried and blind via/via walls and it is the key to produce high quality HDI PCB