Tesla's plan for a so-called "Terafab" has exposed mounting tensions with Samsung and TSMC, the two foundries that build its chips, Digitimes reports.

The report, published by the Taipei-based trade outlet, centers on a single word with heavy implications. A terafab is a plant sized at the terawatt scale of output — a facility so large that it would let Tesla design and fab its own silicon rather than depend on outside foundries. For Samsung Foundry and TSMC, that prospect cuts against the business they have built with the automaker.

Neither Tesla, Samsung nor TSMC has commented publicly on the report. Digitimes did not cite specific capacity figures, investment amounts or timelines.

Why does a "Terafab" threaten foundry relationships?

The friction follows a familiar pattern in the semiconductor industry. A large customer grows big enough that building its own capacity looks cheaper than buying wafers. The foundries that served that customer then face a rival built from the demand they helped create.

Digitimes frames the Tesla case in those terms. The outlet reports that tensions with Samsung and TSMC have grown as the Terafab concept has advanced from talk toward a concrete threat to their Tesla revenue.

The word "exposes" in the report's framing matters. It suggests the strain already exists. The Terafab plan, in this reading, did not create the tension. It revealed it.

What does Tesla buy from these foundries today?

Digitimes does not detail the specific products in its headline report. Tesla's silicon portfolio, however, is the commercial backdrop for any foundry relationship of this scale.

The company designs custom chips for driver assistance and infotainment. It also buys large volumes of standard processors and AI accelerators for its training compute. Any move to internalize fabrication would touch both categories.

Samsung and TSMC are the only two merchant foundries able to serve a customer of Tesla's scale at leading-edge nodes. That duopoly position gives them pricing power. It also gives a customer of Tesla's size a reason to want an exit.

How does this fit the broader insourcing wave?

The report lands amid a wider shift in who owns fabrication capacity. Large system makers have spent the past several years pulling chip design in-house. Some have gone further and pursued ownership of the factories themselves.

Tesla chief executive Elon Musk has staked the company's product line on compute. Custom silicon is central to that strategy. A terafab would extend the same logic from design into manufacturing.

For Samsung, the stakes carry an extra edge. Samsung Foundry has competed hard for large automotive and AI customers to close the gap with TSMC. Losing a customer the size of Tesla to that customer's own fab would hit twice — once in lost wafers, once in lost leverage against its larger rival.

For TSMC, the calculus differs. Its order book spans far more customers. But the Digitimes report indicates that Tesla's trajectory has become a point of tension there as well.

What is confirmed and what is not?

Confirmed: Digitimes reports growing tensions between Tesla and both Samsung and TSMC, tied to the Terafab concept.

Not confirmed: any investment figure, site location, capacity target, process node or construction timeline for a Tesla terafab. No party has confirmed such a plan on the record.

Readers should treat the report as a signal of direction, not a factory announcement.

What comes next?

The competitive question now is whether Tesla commits capital to fabrication or uses the Terafab concept as leverage in foundry price talks. Digitimes' reporting suggests the relationship damage is already under way, and both Samsung and TSMC will have to price and schedule Tesla's future wafer demand with that risk on the table.