The rapid growth of AI and high-performance computing is placing increasing pressure on traditional semiconductor architectures. As continued transistor scaling becomes more challenging, the industry is turning to chiplets, heterogeneous integration, and 3D packaging to bring more compute, memory, and connectivity into a single system.
This transition is changing not only how chips are packaged, but also how systems are designed, simulated, cooled, and verified. It is creating new requirements for multiphysics analysis, advanced materials, and EDA automation. Below are six technology shifts that are having a major impact on the next generation of 3D ICs.
Why is AI accelerating the adoption of 3D packaging?
Modern AI systems require ever-increasing amounts of compute capability and memory bandwidth. At the same time, reticle size limits, manufacturing yield at advanced process nodes, and the constraints of monolithic SoC architectures are making it increasingly difficult to continue scaling a single large die.
Instead of continually increasing the size of a single chip, the semiconductor industry is disaggregating logic, memory, and I/O into multiple dies and integrating them through 2.5D and 3D structures. This approach can shorten interconnect distances and increase system density, but it also introduces greater electrical, thermal, and mechanical complexity.
1. Increasing integration density at the package and wafer level
Advanced packaging is moving toward finer interconnect pitches and higher integration density. As thermocompression bonding approaches its practical limits, hybrid bonding is opening the way for 3D interconnect pitches of around 1 µm and potentially even smaller.
At the same time, wafer-scale architectures are being explored as a way to bring much larger amounts of computing capability into a single system. Designs such as Cerebras WSE-3 and emerging wafer-scale approaches from TSMC illustrate how the boundaries between chip, package, and system are becoming increasingly blurred.
This evolution is pushing EDA toward larger-scale simulation environments in which power, thermal behavior, signal integrity, and mechanical stress must be analyzed together.
2. Co-Packaged Optics brings optical connectivity closer to the chip
As data rates continue to increase, traditional electrical interconnects face growing challenges related to power consumption and signal loss. Co-Packaged Optics (CPO) brings photonic ICs closer to xPUs or switch silicon, significantly reducing signal transmission distances.
Tightly integrating electronic ICs and photonic ICs can improve bandwidth density and signal integrity, but it also introduces new design challenges involving hybrid bonding, die thinning, thermo-mechanical stress, and the effect of temperature on optical wavelengths.
3. Cooling becomes part of the package architecture
Stacking memory and logic can increase bandwidth, but it also brings multiple heat sources much closer together. This is particularly important for HBM, as memory typically has lower temperature limits than advanced logic devices.
Microfluidic cooling solutions are being explored to bring coolant much closer to heat-generating regions through extremely small channels. When cooling is integrated directly into the package, engineers must model fluid flow, thermal behavior, electrical effects, and mechanical interactions within the same 3D structure.
4. New materials become critical to performance and reliability
The evolution of 3D ICs depends on more than silicon alone. Glass substrates are attracting increasing attention because of their mechanical and electrical properties, which can be advantageous for large-area, high-speed, and high-frequency designs.
Technologies such as Through-Glass Vias (TGVs) and Laser-Induced Deep Etching are expanding the possibilities for heterogeneous integration. However, the brittle nature of glass also creates challenges related to stress, cracking, and long-term package reliability.
Polymer materials within the package are also becoming increasingly important for controlling mechanical stress, improving reliability, and maintaining manufacturing yield in chiplet, 2.5D, and 3D architectures.
5. Antenna-in-Package expands the role of 3D ICs in mmWave and 6G
As wireless systems move toward sub-THz frequencies and beyond 100 GHz, antenna dimensions become small enough to allow direct integration within the package. Antenna-in-Package (AiP) is therefore becoming an important technology direction for mmWave and future 6G systems.
Vertical antenna integration can shorten RF signal paths and reduce parasitic losses, but it also increases sensitivity to dimensional variations, dielectric thickness, via geometry, layer alignment, and EMI/EMC effects.
At very high frequencies, manufacturing variations of only a few micrometers can significantly affect antenna efficiency and beamforming accuracy.
6. AI is becoming part of the 3D IC design workflow
The 3D IC design space is becoming increasingly large and tightly coupled across multiple physical domains. Traditional rule-based automation methods are therefore becoming less capable of handling the growing number of design alternatives and constraints.
AI-native workflows are being introduced into tasks such as design space exploration, routing, multiphysics optimization, DFT, and result analysis. Large Language Models (LLMs) can also help convert design requirements into structured data that can be used for simulation and engineering analysis.
During implementation, AI can learn from previous designs to help optimization converge more quickly. At signoff, AI can assist in consolidating results across multiple engineering domains and highlighting remaining risks for design teams.
The goal is not to replace engineers, but to expand their ability to explore design alternatives and make better-informed decisions.
3D IC is becoming a system-level design challenge
These six technology shifts show that 3D packaging is no longer simply a final step for connecting completed dies. Architecture, materials, photonics, thermal behavior, RF, and AI increasingly need to be considered together from the earliest stages of the design process.
This requires EDA workflows that connect die, package, and system design while combining multiphysics analysis and automation to help engineers identify risks earlier and evaluate more design alternatives.
Are you exploring design and verification solutions for 3D ICs, chiplets, and advanced packaging? Contact Vietbay to learn more about Siemens EDA solutions that can support your project requirements.
