Industry Focuses on Manufacturing Over 3D Packaging for Smartphones
Despite ongoing discussions in the tech world about the potential adoption of 3D packaging technology for smartphone system-on-chips (SoCs), recent insights suggest that leading companies like TSMC and Huawei are not pursuing this path for mobile devices anytime soon. The primary challenge lies in thermal management, as the heat generated by stacked chip designs in 3D packaging is difficult to dissipate effectively within the confined space of smartphones.
Unlike desktop or server processors, which benefit from robust cooling solutions, smartphone chipsets have limited thermal headroom, relying mostly on vapour chambers or small fans. The stacked layers in 3D packaging create heat bottlenecks, especially in the lower layers, making it impractical for current smartphone designs.
Technical Challenges and Current Innovations
TSMC’s upcoming 2nm process promises efficiency gains, but the increasing complexity and size of SoCs mean that new packaging methods are needed to push performance further. However, 3D packaging introduces significant thermal drawbacks that outweigh its benefits for smartphones. Samsung’s recent introduction of the Heat Pass Block (HPB) technology in the Exynos 2600, which places a copper heatsink atop the silicon die, is a step towards better heat management but does not resolve the issues inherent to 3D stacking.
According to a Weibo leaker known as Fixed-focus digital cameras, the industry rumours about TSMC and Huawei adopting 3D packaging for mobile chips are unfounded. Instead, these companies are concentrating on refining manufacturing processes rather than switching to 3D packaging techniques.
Apple’s Potential Role and Industry Context
Apple may be the first to experiment with advanced packaging technologies like 2.5D or even 3D packaging, particularly for its M-series chips used in laptops and tablets. The upcoming M5 Pro and M5 Max processors are expected to utilise TSMC’s 2.5D packaging technology, marking a departure from the Integrated Fan-Out (InFO) packaging previously used. However, the adoption of 3D packaging for Apple’s A-series chips, which power iPhones, seems unlikely due to the same thermal constraints.
Furthermore, consumer interest in cutting-edge fabrication nodes appears to be waning, prompting companies such as Apple, Qualcomm, and MediaTek to focus more on architectural improvements than solely on process shrinks. This shift underscores the complexity of balancing performance gains with practical considerations like heat dissipation in mobile devices.
Looking Ahead
While 3D packaging remains an intriguing technology, its application in smartphones faces significant hurdles. The industry’s current trajectory suggests that improvements in manufacturing processes and chip architecture will continue to be the primary avenues for enhancing smartphone SoC performance. Apple’s gradual move towards 2.5D packaging in its M-series chips might pave the way for more advanced packaging techniques in the future, but widespread adoption in smartphones is unlikely in the near term.
For now, smartphone chipsets will probably stick with traditional packaging methods, even as manufacturers explore new solutions to overcome thermal and performance challenges.