Demystifying 3D ICs: A practical framework for heterogeneous integration

By Keith Felton

March 24, 2026

For decades, the semiconductor industry has relied on the relentless pursuit of Moore’s Law—the doubling of transistors on an IC every two years—to deliver ever-increasing performance and functionality. This traditional approach, primarily focused on scaling individual transistors and integrating more components onto a single, monolithic 2D die, has driven innovation across countless industries.

However, as we approach the physical limits of silicon, and the economic realities of advanced process nodes become increasingly prohibitive, the conventional path of monolithic scaling is facing significant roadblocks. Companies are encountering diminishing returns in terms of performance gains, escalating design and manufacturing costs, and challenges in integrating diverse functionalities onto a single chip without compromising yield or power efficiency.

In response to these growing pressures, a fundamental shift is occurring in chip design: the move toward 3D ICs and heterogeneous integration. This paradigm offers a compelling alternative, allowing companies to overcome the limitations of traditional 2D scaling by integrating multiple specialized chiplets—each potentially manufactured on different process technologies and optimized for specific tasks—into a single, advanced package.

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