Theses›Datacentre & AI compute›In-package cooling

In-package cooling

Cooling inside the AI-accelerator package, sized once across its three routes

  • Early
  • $1.1B by 2035

The call, a draftHeat inside the AI-chip package, where the cold plate can't reach, is a growing problem as power delivery moves under the chip. Counted once, the part open to new suppliers is a few hundred million dollars in 2030, and the window is early.

Disclosure: TrimTabs, one of the companies named here, pays me to write a newsletter for it.

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Fig. 1The balance. Drivers and catalysts against restraints, each block sized by its weight; catalysts hang dashed because they have not happened yet, sized by their odds. It tips toward the drivers.
  1. D1About 7.8M accelerator packages run on backside vertical power by 2030, each with a converter plane that has no path to the cold plate.
  2. D2TSMC runs direct-to-silicon liquid cooling on production-grade CoWoS-R up to 3.4kW, with commercial use around 2027.
  3. D3IDTechEx has next-generation die-attach materials for advanced packaging growing 31% a year, from about $34M in 2026 to about $500M by 2036.
  4. R1TSMC takes the etch-and-bond step for in-die channels, about 60% of that content, and may take the design kit too.
  5. R2The three approaches compete for the same heat, so a package with channels in the die needs no die-attach material and maybe no converter film.
  6. R3No module or package bill of materials is public, so every per-package dollar is an estimate.
  7. R4Carbon-nanotube die-attach materials have no qualified accelerator slot yet.
  8. C1A shipping accelerator platform above about 1M units a year uses backside vertical power with a dedicated converter-plane thermal solution.31 Dec 2028
  9. C2TSMC's in-die liquid cooling ships in a named volume package.31 Dec 2027
Rests onthe beliefs underneath
Supported by · confidence
What would prove itdated tests, open and resolved
202720282029today1234watch 202720282029today1234watch
Fig. 2Each ring is a dated test: dashed while open, struck through when overdue, ticked or crossed once resolved.
  1. 1Vicor's second-generation vertical power ramping with a hyperscaler and two OEM programmes.Dec 2027 · open
  2. 2TSMC's in-die liquid cooling in a named volume package.Dec 2027 · open
  3. 3TSMC's integrated voltage regulator in CoWoS-L moving the converter into the package.Dec 2028 · open
  4. 4Whether substrate microchannels become the default converter-plane answer with no merchant material designed in.Dec 2028 · open
Expressionslisted, private, technologies
  • TSMTSMC
    • cheap
     Develops IMC-Si direct-to-silicon liquid cooling etched and bonded into CoWoS packages for AI-accelerator customers.
  • VICRVicor
    • fair
     Sells vertical power-delivery modules that sit under AI accelerators, with the converter-plane thermal solution built into the module.
  • IFX.DEInfineon Technologies (with Delta)
    • cheap
     Sells vertical power modules for AI silicon, co-developed with Delta, that carry their own under-package thermal path.
  • MPWRMonolithic Power Systems
    • full
     Sells power modules for AI-accelerator boards, a buyer and integrator of converter-plane thermal content.
  • HEN3.DEHenkel
    • expensive
     Sells Bergquist and Loctite thermal interface materials and die-attach products to chip packagers.
  • 4004.TResonac
    • expensive
     Sells die-bonding films and other packaging materials to OSATs and foundries.
Private · 6 private companies, 4 of them in the US.

EMCOOL · Carbice · NAWAH · TrimTabs · Akash Systems · Arieca

2 more private companies tracked, not shown

Technologies
Who has already bet on itprivate rounds, from public sources

$24M raised by 3 companies, $43M of it in the last three years. Wave building: Money is arriving: recent rounds and tier-1 funds are in, but no runaway leader yet.

Backed by a top-tier venture firm: Akash Systems.

What changedthe record, newest first
  • 13 Oct 2026Counted once, the market for cooling inside an AI-chip package is a few hundred million dollars in 2030, not the billion-plus you get by adding up the converter, in-die and interface stories, because they compete for the same heat and the package owners keep much of it.
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