Mature-Node Chip Suppliers See AI Demand Spread to Companion Chips
Summary
Axcelis and Diodes see AI infrastructure demand spreading into mature-node power, protection and thermal chips, although broader industrial recovery also matters.
On November 5, 2026, Axcelis Technologies (ACLS) and Diodes Incorporated (DIOD) said on their fiscal 2026 third-quarter earnings calls that AI data-center construction was spreading demand beyond GPUs and memory into power, protection, connectivity and thermal-management chips, as well as the equipment used to make these mature-node devices.[1][2]
Higher rack power increases companion-chip content
Higher AI server power density lengthens the power and control chain. Electricity entering a rack passes through several voltage-conversion stages. The system must also monitor current, temperature and faults, while protection devices, fan controls and connectivity chips keep it running. The move toward 400-volt and 800-volt power architectures adds high-voltage conversion steps, so semiconductor demand per server extends beyond compute chips.
Many of these companion devices use mature nodes or specialty processes. As demand rises, analog, power, sensing and connectivity suppliers need more wafer capacity, which can lift foundry utilization and equipment purchases. Axcelis sells ion-implant equipment into wafer manufacturing. Diodes sells analog and discrete devices directly into server power and infrastructure. The two companies therefore see the same transmission chain from different positions.
Equipment orders and device revenue are both changing
Axcelis is seeing stronger mature-node equipment demand. Management said data centers had previously driven advanced computing chips such as GPUs and memory, but supporting infrastructure now also needs more relatively mature silicon devices. The company attributed the change to an ordinary recovery after inventory digestion plus incremental data-center demand.[1]
“It's basically a spillover, a spillover. Plus, they've also gone through that digestion anyway. I mean, they were already getting tight in supply, so all the other applications were going to be demanding extra supply, but then on top of that, you've got the data center demand, so it's kind of a recovery with extra demand.”[1]
Diodes is seeing stronger companion-device demand and industrial revenue. The company reported that industrial revenue rose 26% sequentially and 50% year over year, with opportunities across AI infrastructure, automation, energy, smart metering and robotics.[2] It also said rising AI server power density was expanding device content in power management, monitoring, protection, connectivity and thermal management. Diodes reported increasing demand for silicon-carbide products in power supplies for 400-volt and 800-volt platforms.[2]
Investors still need to separate AI demand from recovery
More companion chips could transmit AI capital spending into the mature-node supply chain. Each additional conversion, monitoring or protection stage can increase device content per rack. Higher device shipments can then flow into mature-node foundry capacity and equipment such as ion implantation. The potential beneficiary set therefore extends from advanced computing into analog, power, sensing and manufacturing equipment.
The attribution has a clear boundary. Axcelis described the move as a cyclical recovery plus incremental AI demand. Diodes' industrial growth also included automation, energy, metering and robotics, so the frozen evidence cannot assign all of the increase to AI. Some 800-volt programs may also be delayed. Useful follow-up indicators include data-center revenue, device production ramps, mature-node utilization and whether equipment orders persist.
Companies exposed to the same mechanism
- Texas Instruments (TXN): Its analog and embedded portfolio is exposed as 800-volt systems add conversion stages, but the evidence reviewed here does not establish the size of future gains.
- onsemi (ON): Its silicon-carbide and silicon MOSFET products serve high-density power platforms, creating exposure to power-system expansion, with actual gains dependent on production ramps.
- Allegro MicroSystems (ALGM): Its current sensors may gain content as rack current rises, although some 800-volt programs have already faced timing delays.
Sources
[1] Drillr · Axcelis Technologies · November 5, 2026 · Fiscal 2026 third-quarter earnings call
“It's basically a spillover, a spillover. Plus, they've also gone through that digestion anyway. I mean, they were already getting tight in supply, so all the other applications were going to be demanding extra supply, but then on top of that, you've got the data center demand, so it's kind of a recovery with extra demand.”
[2] Drillr · Diodes Incorporated · November 5, 2026 · Fiscal 2026 third-quarter earnings call
This material is for identifying potentially overlooked industry changes and companies only. It is not a stock recommendation.