A critical component for AI hardware, the ABF substrate, is quickly becoming a strategic battleground for the industry's future. This high-performance circuit board is essential for connecting advanced chips, and a series of recent events suggest a significant supply squeeze is on the horizon, forcing major players like Nvidia to secure their supply chains.
The primary driver behind this shift is the rise of Co-Packaged Optics (CPO). As AI models grow more complex, they need to process vast amounts of data at incredible speeds. CPO technology addresses this by integrating optical communication components directly onto the same package as the main processor. This dramatically speeds up data flow but requires larger, more complex, and more advanced ABF substrates to house everything.
This growing demand is colliding with a tightening supply chain. Three key signals highlight this trend. First, Ajinomoto, a dominant supplier of the essential ABF build-up film, announced a 30% price hike, signaling strong demand and its own pricing power. Second, the price of copper, a key raw material for substrates, has surged over 38%, pushing production costs higher. Third, the recent publication of a 3.2 Tb/s CPO standard by the Optical Internetworking Forum (OIF) reduces the technical risk for companies, making them more confident to adopt the technology and further fueling demand.
At the same time, the technology to implement CPO is rapidly maturing. Recent tech conferences like OFC 2026 showcased practical demonstrations from companies like Broadcom, proving that CPO is moving from a theoretical concept to a deployable reality. Furthermore, industry giants including Nvidia, AMD, and Microsoft have formed the Optical Compute Interconnect (OCI) consortium to standardize the technology, paving the way for wider adoption.
This all leads to a predictable outcome. AI platform vendors, particularly Nvidia with its upcoming Vera Rubin platform, cannot afford production delays caused by component shortages, as was the case previously with CoWoS packaging and HBM memory. To avoid repeating history, Nvidia is highly likely to use its proven strategy of long-term agreements, deposits, and capacity commitments to lock in a stable supply of high-end ABF substrates. This proactive move secures their production roadmap but may also contribute to higher costs for next-generation AI systems.
- ABF Substrate: Ajinomoto Build-up Film substrate. A high-performance printed circuit board used for mounting and connecting complex semiconductors like CPUs and GPUs, essential for their performance and reliability.
- Co-Packaged Optics (CPO): A technology that integrates optical components for data transmission directly into the same package as the main silicon chips, enabling faster and more energy-efficient communication.
- HBM (High Bandwidth Memory): A type of high-performance RAM that stacks memory chips vertically to provide much higher bandwidth than traditional memory, crucial for data-intensive AI applications.