The Future of Electronics Packaging is Chiplet Architecture

ABSTRACT The transition from monolithic System-on-Chip (SoC) designs to chiplet-based architectures has redefined the landscape of advanced electronics packaging, driven by demands for increased functionality, heterogeneous integration, and improved performance per watt. Central to this shift is the development of high-density, low-latency interconnect technologies that can support multi-chiplet integration within a single package. Among these, hybrid bonding has emerged as a key assembly technique, offering superior electrical, thermal, and mechanical performance compared to conventional micro-bump and thermocompression bonding methods. Hybrid bonding enables direct copper-to-copper (Cu-Cu) and dielectric-to-dielectric interfaces between dies or chiplets at sub-10 μm pitches, dramatically increasing interconnect density while reducing parasitic resistance, capacitance, and interconnect latency. This paper serves as a technical roadmap and process assessment for the integration of hybrid bonding in fine pitch chiplet packaging.