Samsung Turns to TSMC to Make Base Dies for NVHBM Stacks

Samsung has contracted TSMC to manufacture the base dies for its NVHBM memory stacks, TechPowerUp reports — a deal that routes a critical layer of Samsung's next-generation high-bandwidth memory to its closest foundry competitor.

The report gives no capacity figures, wafer volumes, or process node details. What it does confirm is the direction: Samsung's memory division will buy logic base dies fabbed by TSMC rather than produce them entirely in-house or at Samsung Foundry.

Why does the base die matter?

An HBM package stacks DRAM dies on top of a logic base die that handles the interface to the host GPU or accelerator. That die sits at the bottom of the stack, carries the through-silicon via connections, and increasingly defines the bandwidth and power profile of the whole module.

As HBM generations have advanced, the base die has drifted from a simple buffer toward fine-pitched logic built on leading-edge foundry processes. TSMC already makes base dies for SK hynix's HBM3E supply to Nvidia — a fact widely reported across the industry. Samsung now appears to be following the same pattern for its NVHBM program.

What does this mean for Samsung Foundry?

For Samsung's foundry arm, the arrangement stings. Its parent memory business, the world's largest by bits shipped, has chosen a competitor's process for a component central to its most strategically important product line.

Yet it's also pragmatic. HBM customers — above all Nvidia, whose accelerators consume the bulk of industry HBM output — have validated supply chains built on TSMC-fabbed base dies. Matching that recipe may shorten Samsung's qualification cycles with major buyers, where it has trailed SK hynix in HBM3E approvals.

The move fits a broader pattern of specialization. Memory makers focus on DRAM stacking; logic foundries handle the interface silicon. Samsung keeps the stack, the test, and the package. TSMC gets the wafer revenue.

What's still unknown?

TechPowerUp's item names no numbers, so several questions stay open:

• Volume: no wafer starts or monthly capacity disclosed
• Node: no confirmation of which TSMC process the base dies will use
• Timing: no production start or qualification date given
• Scope: unclear whether the arrangement covers all NVHBM output or an initial tranche

Analyst estimates on NVHBM demand were not cited in the report, so pricing and share projections remain speculative until Samsung or its customers detail qualification milestones.

If Samsung confirms the deal with volumes and a node, expect competitive pressure on SK hynix to defend its HBM lead — and a rare public acknowledgment, from Samsung itself, that its foundry can't yet win every logic socket its memory business needs.