Resonac Successfully Upholds Patent on Liquid Encapsulant for AI Semiconductor Packages, Enhancing 2.5D Package Reliability

Resonac Corporation Japan

Overview

Resonac Corporation announced the Japan Patent Office upheld its patent (No. 7687499) on a liquid encapsulant for 2.5D semiconductor packages in AI applications. This encapsulant is critical for addressing reliability issues like stress and crack generation caused by thermal expansion differences between materials. Resonac optimized the resin and additives to control thermal expansion coefficients and elastic modulus within a specific range, significantly improving long-term package reliability.

In Depth

Key Findings

Resonac Corporation has announced that the Japan Patent Office (JPO) upheld its patent (No. 7687499) for a liquid encapsulant specifically designed for 2.5D semiconductor packages used in AI applications. This patent validation solidifies Resonac’s technological leadership in providing critical materials essential for enhancing the reliability of high-performance semiconductor packages, a cornerstone for the burgeoning AI industry.

Technical / Clinical Details

This liquid encapsulant was developed to mitigate critical reliability issues, such as stress accumulation and crack formation, which arise in 2.5D semiconductor packages due to differing coefficients of thermal expansion (CTEs) among heterogeneous materials (e.g., silicon chips, interposers, and substrates) during thermal cycling. Resonac successfully established a technology to precisely control the encapsulant’s CTE and elastic modulus within a narrow, optimized range by fine-tuning specific resin compositions and additive formulations. This controlled property profile enables the encapsulant to effectively alleviate stress concentrations across the entire package, significantly improving the long-term reliability and durability of high-power, high-heat generating devices like AI chips, under demanding operational environments.

Background & Context

The rapid advancements in Artificial Intelligence (AI) and High-Performance Computing (HPC) demand unprecedented levels of integration density and heat dissipation capabilities from semiconductor packages. 2.5D packaging technology, which involves placing multiple chips side-by-side on an interposer for high-density interconnection, offers significant performance improvements over traditional 2D packages. However, ensuring the thermomechanical reliability of these heterogeneous material combinations has been a major challenge. Resonac’s liquid encapsulant is recognized by the semiconductor industry as a crucial key material for overcoming these reliability hurdles.

Strategic Significance & Outlook

The JPO’s decision to uphold the patent further strengthens Resonac’s position as a leading material supplier in the critical AI semiconductor market. Its liquid encapsulant technology is indispensable for the mass production and widespread adoption of next-generation high-performance semiconductor devices, including AI accelerators, GPUs, and CPUs. This, in turn, will support the development of various cutting-edge technologies in data centers, autonomous driving, and 5G/6G communication. Moving forward, Resonac is committed to continuous innovation in encapsulant technology, contributing to the sustainable growth of the semiconductor industry and the advancement of a digital society on a global scale, solidifying its role as a key enabler of future technological progress.

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