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Glass Core Technology Breakthrough Potential for High-Speed Interconnects

12.6.2025
Reading Time: 4 mins read
A A

This video and article delve into the groundbreaking potential of Glass Core Technology (GCT), as discussed in Judy Warner’s episode of The EEcosystem Podcast with Steve Hillerich, Product Manager at Samtec. GCT is poised to revolutionize high-speed interconnects, miniaturization, and system integration by meticulously controlling every aspect of glass substrate development, spanning from TGV drilling to RDL patterning.

In the rapidly evolving landscape of RF engineering, the demand for high bandwidth and superior performance has led to groundbreaking innovations.

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One such development is Glass Core Technology (GCT). In this article, we delve into the nuances of GCT, its applications, and its transformative impact on interconnects, as discussed by Steve Hill, Product Manager at Samtec.

What is Glass Core Technology?

Glass Core Technology refers to the utilization of glass substrates at the device level to enhance interconnect performance. Unlike traditional high-speed cabling and connectors, GCT offers unique characteristics such as:

  • Miniaturization: Smaller device footprints due to finer features and tighter via diameters.
  • High-Frequency Performance: Capable of handling frequencies over 300 GHz with low signal loss.
  • Uniformity and Reliability: Consistent thickness, flatness, and superior thermal and mechanical durability.

Technical Aspects of GCT

Metallization of Glass

One of the most challenging aspects of GCT is metallizing glass for reliable interconnects. Unlike PCBs, glass requires semiconductor-grade fabrication techniques such as:

  • Laser Drilling and Chemical Etching: For creating precise Through Glass Vias (TGVs).
  • Sputtering and Plating: To achieve uniform metal layers with high adhesion and conductivity.
  • Cleanroom Environments: Ensuring contamination-free processing for optimal performance.

Substrate vs. Interposer

GCT can function both as a substrate and an interposer. While substrates directly mount dies in 2.5D or 3D stacking configurations, interposers serve as intermediary layers. The distinction often depends on the specific application and customer requirements.

Performance Benefits and Applications

Key Advantages

  • High Bandwidth: Supports over 300 GHz frequencies with minimal signal degradation.
  • Embedded RF Components: Integration of passive devices like filters, waveguides, and dividers directly into the glass substrate.
  • Hermetic Sealing: TGVs are hermetically sealed, making GCT suitable for harsh environments.

Real-World Applications

  • Telecom and Data Centers: Enabling 6G/7G infrastructure with high-speed backhaul systems.
  • Biomedical Devices: Miniaturized, biocompatible implants for advanced diagnostics.
  • Defense and Aerospace: High-reliability applications requiring durability under extreme conditions.
  • Consumer Electronics: Compact, high-performance handheld devices for applications like DNA sequencing.

Future Outlook: Process Design Kits (PDKs)

To streamline the adoption of GCT, Samtec is developing Process Design Kits. These kits will allow designers to:

  • Easily integrate glass-based components into their designs.
  • Utilize pre-validated design blocks for faster prototyping.
  • Achieve design simulations that closely match real-world performance.

Conclusion

Glass Core Technology is not just an incremental improvement; it’s a paradigm shift in high-speed interconnects. As industries push the boundaries of miniaturization, speed, and reliability, GCT stands out as a critical enabler of next-generation technologies.

Related

Source: Samtec, EEcosystem Podcast

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