Google's specialized TPU processors are drawing attention across the global tech industry for their impressive performance and cost efficiency. But the company's ambitions to expand into the broader market are running into an unprecedented supply chain barrier that could hold back growth before it even begins.
The Appeal of the Ironwood Chip and the Manufacturing Challenge
In AI computing today, interest in specialized chips (ASICs) is greater than ever. The main reason is a belief that in the next tier of AI applications, specifically the inferencing stage, chips like Google's TPU will have a clear edge thanks to better Total Cost of Ownership (TCO) and stronger processing performance. After the impressive launch of the 7th-generation TPU, codenamed "Ironwood," major names in the tech world such as Meta and Anthropic have expressed strong interest in bringing these ASICs into their workloads.
Adoption of TPU processors by outside partners is gaining momentum. Still, a harsh reality is emerging: supply chain constraints pose a considerable challenge for Google if it truly intends to enter the broad market for hardware infrastructure.
According to a detailed report from ChinaTimes, Google's TPU output may fall short of market expectations in terms of volume. The root cause is not the chip's design. Rather, the company is struggling to secure advanced packaging services from key partners such as TSMC. That capacity is essential for a successful production ramp to meet growing demand.
Advanced Packaging Technology Becomes the Barrier
Modern packaging technologies such as CoWoS (Chip-on-Wafer-on-Substrate) are among the main methods chipmakers use to push processing performance to a new level compared with earlier generations. For the TPUv7 Ironwood, Google adopted a multi-chip module (MCM) design. This design lets the company combine several smaller chips into a single unified package, instead of using one large monolithic silicon die as in the traditional approach.
Specifically, rather than one large single die, TPUv7 places multiple silicon dies on an intermediate silicon interposer, with microbump arrays connecting the chiplets together. This complex structure delivers excellent scalability and allows the internal design to be optimized specifically for matrix multipliers and inference networks. One notable detail is that Ironwood also integrates network physical-layer circuits (PHYs) and routing logic directly into the chip package through interposer routing, creating die-to-die (D2D) connections with extremely low latency.
Advanced packaging is clearly an integral, inseparable part of Google's TPU technology stack. For that reason, the company has to secure enough production capacity at this stage if it wants to sell more chips to outside partners.
Market Outlook and Potential Alternatives
However, a forecast from Fubon Research paints a less rosy picture. The firm predicts that Google TPU shipments in 2026 will be lower than the forecasts from mainstream research firms. The main reason is that the CoWoS packaging bottleneck is too large to ignore. TSMC's current supply chain has already committed all of its capacity to products for longtime "VIP" customers such as Apple and NVIDIA.
As a result, taking on additional large customers for advanced packaging is a difficult move for TSMC, even as it spends heavily to expand production capacity. Because Google can be considered a relatively new "rookie" in the supply chain when it comes to volume manufacturing, it will almost certainly be at the back of the queue.
This does not mean TPU chips will not be welcomed by the market. It simply reflects the fact that bottlenecks across the industry are making it hard for Google to deliver its custom silicon to a wider range of customers. One direction Google could consider to resolve the situation is to tap the capacity of other companies such as Intel or Amkor for advanced packaging. There are rumors that the tech giant is exploring EMIB-T solutions as an alternative. The AI supply chain is inherently hard to predict when it comes to fulfilling customer orders, so we cannot be completely certain what Google's next move will be.
