New Laminate Technology Eliminates Fiber Weave Skew While Delivering Ultra-Low Loss and High Reliability for Next-Generation 224G and 448G Systems
Advanced Chip & Circuit Materials, Inc. has announced the launch of Celeritas™ SF1600, a next-generation laminate and prepreg material engineered to eliminate fiber weave skew at its fundamental source. As data rates in high-speed digital systems accelerate toward 224 Gbps PAM4 signaling and beyond, traditional mitigation techniques are no longer sufficient to maintain signal integrity. With Celeritas SF1600, ACCM introduces a materials-level innovation designed to address one of the most persistent and complex challenges in advanced PCB design.
Fiber weave skew has long been recognized as a limiting factor in differential signal transmission. The issue arises from the inherent structure of woven glass reinforcement used in conventional laminate materials. This woven architecture creates a spatially periodic dielectric environment, where regions alternate between resin-rich and glass-rich zones. As differential signal pairs traverse these non-uniform paths, each conductor experiences slightly different dielectric properties. This imbalance introduces timing mismatches—commonly referred to as skew—which degrade signal quality and increase bit error rates.
Historically, engineers have attempted to mitigate skew through layout-level techniques such as panel rotation, serpentine routing, and zig-zag compensation. While these approaches can provide incremental improvements at lower data rates, they fail to address the root cause of the problem. At ultra-high speeds, particularly in systems operating at 224 Gbps and moving toward 448 Gbps, these methods become increasingly ineffective. The physical limitations of the material itself dominate performance, rendering routing-based solutions insufficient.
Celeritas SF1600 represents a fundamental shift in how this challenge is addressed. Rather than attempting to compensate for skew after it occurs, ACCM has engineered a material that eliminates the underlying cause. Through proprietary resin formulations and advanced reinforcement technologies, the material removes the dielectric inconsistencies associated with woven glass structures. The result is a uniform propagation environment that enables truly zero-skew performance, validated through repeated measurement and testing.
In addition to solving the skew problem, Celeritas SF1600 delivers industry-leading electrical performance. The material features a dielectric constant (Dk) of 2.80 and an exceptionally low dissipation factor (Df) of 0.0007. These properties remain stable across a wide frequency range—up to 110 GHz—as well as under varying temperature and moisture conditions. This level of stability is critical for maintaining signal integrity in modern high-speed interconnects, where even minor variations can have significant performance implications.
Measured insertion loss further underscores the material’s capabilities. On 7-mil differential pairs using HVLP4 copper, Celeritas SF1600 achieves approximately 1.05 dB per inch at 56 GHz. With the adoption of next-generation HVLP5 copper, this figure is projected to improve to around 0.95 dB per inch. These values place the material among the lowest-loss options available, making it highly suitable for applications requiring extended reach and high bandwidth efficiency.
The introduction of Celeritas SF1600 also challenges the prevailing industry trend toward quartz-based laminate systems. While quartz materials have been explored as a means of reducing dielectric loss, they introduce a range of new challenges that can compromise manufacturability and reliability. Many quartz-based systems rely on heavily filler-loaded resin chemistries to meet coefficient of thermal expansion (CTE) and dissipation factor requirements. This creates a mismatch with quartz fibers, which have a significantly higher softening point—approximately 1,665°C.
This mismatch complicates standard manufacturing processes, particularly laser drilling. Conventional CO2 laser systems struggle to cleanly process these materials, often leaving behind fiber stubs within microvia walls. These residues can negatively impact plating quality and long-term via reliability, introducing latent defects that may only manifest under operational stress. In contrast, Celeritas SF1600 is fully compatible with standard CO2 and UV laser drilling processes, producing clean, consistent results without requiring specialized equipment or process adjustments.
Adhesion performance is another area where Celeritas SF1600 demonstrates clear advantages. Quartz-based materials typically exhibit relatively low peel strength, often around 2 pli when used with HVLP4 copper. This limitation restricts their compatibility with more advanced copper foils, such as HVLP5, which are essential for minimizing conductor loss at higher frequencies. Celeritas SF1600, by comparison, achieves peel strength exceeding 5 pli on the same copper, providing robust adhesion and enabling designers to fully leverage next-generation conductor technologies.
Thermal performance is equally robust. The material offers a glass transition temperature (Tg) of approximately 215°C and a thermal decomposition temperature exceeding 400°C. It successfully passes 50 cycles of 260°C reflow simulation, demonstrating its suitability for demanding assembly processes. Additionally, it exhibits excellent reliability in stacked microvia structures, withstanding up to 500 cycles in OM (optical microscopy) testing. These characteristics make it well-suited for complex, high-density interconnect (HDI) designs.
From a manufacturing perspective, one of the most compelling aspects of Celeritas SF1600 is its compatibility with existing FR-4 processing infrastructure. Unlike many advanced materials that require specialized handling, storage conditions, or processing environments, this material can be integrated into standard production workflows without additional investment. It supports mechanical drilling with no fiber pull-out or excessive tool wear, further simplifying fabrication and reducing operational costs.
Another critical advantage lies in its impact on design efficiency. Traditional approaches to mitigating fiber weave effects often require panel rotation angles exceeding 15 degrees to suppress resonance below the Nyquist frequency for 224 Gbps signaling. This practice leads to significant material waste and increased cost, particularly when using premium laminates with constrained supply. By eliminating fiber weave skew entirely, Celeritas SF1600 removes the need for such compromises, enabling more efficient use of panel real estate and reducing overall system cost.
The implications of these improvements extend beyond laboratory measurements. One of the most challenging aspects of high-speed system validation is the detection of subtle signal integrity issues that do not produce visible physical defects. Bit error rate (BER) failures, for example, often leave no trace on the physical board. There are no cracks, no delamination, and no obvious signs of failure under visual inspection. Instead, the impact is observed at the system level, where links may fail to initialize or operate below expected bandwidth.
This disconnect between physical inspection and functional performance can lead to significant delays in product development. Materials that appear to perform adequately during initial qualification may underperform in real-world deployments, causing costly redesigns and project setbacks. The financial exposure associated with these issues can be substantial, yet it often remains hidden until systems are deployed at scale.
ACCM has addressed this challenge by validating the performance of Celeritas SF1600 under production-representative conditions. This ensures that the material’s performance characteristics are not only theoretically sound but also practically reliable in real-world applications. For design teams working at the forefront of high-speed interconnect technology, this level of validation provides a strong foundation for confident decision-making.
Celeritas SF1600 is available in a range of thicknesses from 25 to 150 micrometers, offering flexibility for a variety of design requirements. Its combination of electrical, thermal, and mechanical properties makes it suitable for a wide range of applications, including data center infrastructure, high-performance computing systems, networking equipment, and next-generation communication platforms.
In the broader context of the electronics industry, the introduction of Celeritas SF1600 highlights the growing importance of materials innovation in enabling continued performance scaling. As signal speeds approach and exceed 224 Gbps, traditional design techniques alone are no longer sufficient to meet performance targets. Instead, breakthroughs at the materials level are required to overcome fundamental physical limitations.
By eliminating fiber weave skew and delivering ultra-low loss performance without sacrificing manufacturability, ACCM’s Celeritas SF1600 sets a new benchmark for high-speed laminate materials. It provides a clear path forward for engineers seeking to design reliable, high-performance systems in an increasingly demanding technological landscape.
Ultimately, the engineering case for adopting advanced materials like Celeritas SF1600 is becoming increasingly compelling. As systems continue to push the boundaries of speed and bandwidth, the ability to ensure consistent, predictable signal behavior will be a defining factor in determining success. With its combination of zero-skew performance, low loss, and seamless integration into existing manufacturing processes, Celeritas SF1600 represents a significant step forward in achieving that goal.
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