AI Chip Demand Tightens ABF Substrate Supply, Co-Investment Model Restarts
N.R. Finch
Nvidia, AMD, and hyperscale cloud providers have locked ABF substrate capacity through 2028, with some customers reviving co-investment deals to secure priority supply; Taiwan's top substrate makers are accelerating expansion, but upstream material shortages and surging demand keep the supply gap wide open.
Why are ABF substrates suddenly so tight?
AI chips carry larger dies, requiring bigger substrates and more layers per package — each chip now consumes far more substrate capacity than previous generations.
This means → the production lines haven't shrunk, but each chip "takes up more seats," so the same line yields fewer chips.
A severe shortage of T-glass fiber cloth — the backbone material inside substrates — is throttling expansion even further.
How are customers fighting for capacity?
Nvidia, AMD, and hyperscalers have signed long-term contracts locking orders through 2028, and are already pushing suppliers to plan expansion for 2029–2030.
Long-term agreements alone aren't enough. Some customers are reviving the co-investment model popular in 2021–2022: supplying their own equipment, prepaying for output, and sharing construction costs in exchange for priority allocation.
In plain terms = buyers are no longer just placing orders and waiting — they're bankrolling the factories themselves. Whoever pays more, ships first.
How aggressively are Taiwan's substrate makers expanding?
Unimicron raised its 2026 capex to NT$53.7 billion (~US$1.66 billion), focused on its Guangfu Phase 2 and Yangmei Phase 2 & 3 plants.
Kinsus added NT$19.6 billion in new project spending to build Yangmei K6C and K6D fabs, and has begun scouting land for future K7 and K8 sites.
Nan Ya PCB is ramping capex after hitting a trough — upgrading advanced capacity at its Shulin plant, retooling its Jinxing fab, and planning to lease a southern Taiwan facility from its parent group. Zhen Ding Tech's subsidiary is expanding in Shenzhen, targeting more than seven factories by 2030.
Why is AMD pouring $10 billion into Taiwan?
AMD CEO Lisa Su announced over US$10 billion in additional Taiwan investment — procurement commitments and strategic partnerships to build a local EFB 2.5D packaging ecosystem. EFB, or Elevated Fanout Bridge, is an advanced packaging method that links multiple dies through bridge chips.
This means → AMD is building an alternative supply path alongside TSMC's CoWoS platform — spreading its bets rather than relying on a single route.
Unimicron, Kinsus, and Nan Ya PCB are all substrate partners, underscoring that big-customer capital commitments are the strongest endorsement of this expansion cycle.
How far will prices climb?
High-end ABF substrates began tightening first in H2 2025, squeezing some BT substrate capacity as well; both markets have entered a quarterly price-hike cycle.
Price increases accelerated in H2 2026, with average quotes rising ~8% per quarter.
Although BT substrates — bismaleimide triazine substrates used mainly in mid- to low-end packaging — were initially expected to see faster increases, high-performance computing demand is concentrated on ABF. ABF's supply gap is wider, and its price gains are forecast to outpace BT.
Could this expansion cycle repeat the 2021 bust?
Suppliers believe the risk is more manageable this time: AI infrastructure spending is unlikely to stop abruptly even if it slows, and there are no signs of double-ordering in the supply chain so far.
Most expansion projects already include prepayment or guaranteed-return arrangements, reducing suppliers' capex exposure.
The core uncertainty remains: can demand hold through 2028 and beyond? That is the make-or-break test for this cycle's expansion logic.
Content is for reference only, not financial advice.