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A semiconductor fab manufactures integrated circuits on silicon wafers; a chip design company defines and develops the chip. They perform different stages of production, though an integrated device manufacturer (IDM) can do both. A fabless company designs chips but contracts a foundry to fabricate them.
What is the difference between a fab and a chip design company?
A fab is a factory or fabrication operation: it processes silicon wafers to form integrated circuits. A chip design company works out what a chip should do and how it will be implemented, including its architecture and design. Design is intellectual and engineering work; fabrication is physical manufacturing.
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Keep the terms distinct: a fab is the factory, while a foundry is a business that provides wafer fabrication, often for customers. A foundry may operate one or more fabs. Conversely, a company that designs chips does not necessarily own a fab.
How a chip moves from design to a finished device
- Design: Engineers define the chip’s architecture, functions, and implementation.
- Front-end fabrication: A fab processes wafers to create integrated circuits.
- Back-end assembly, test, and packaging: The wafer is separated into dies, working dies are tested, and selected dies are packaged into completed devices. The company may handle these tasks itself or use an outsourced semiconductor assembly and test provider (OSAT).
Wafer fabrication is not the same as final packaging and testing. These are later steps in the production chain. The Semiconductor Industry Association (SIA) describes fabrication as highly capital intensive and says a leading-edge fab can cost several billion dollars to construct; that is not a universal current cost estimate for every fab.
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How the main semiconductor business models differ
| Role or model | What it does | Relationship to wafer fabrication |
|---|---|---|
| Fabless design company | Designs chips and focuses on product design and innovation. | Contracts a foundry to fabricate its designs. |
| Foundry | Manufactures chips using customer designs. | Provides wafer fabrication as a service; it can serve fabless companies and customers that also have their own manufacturing. |
| Integrated device manufacturer (IDM) | Designs and manufactures chips within an integrated company. | Combines design with manufacturing; the degree and organization of integration vary. |
| OEM chip designer | Designs chips for its own end products, such as phones, cars, or data-center systems. | May outsource fabrication. |
| OSAT provider | Provides semiconductor assembly, testing, and packaging. | Handles back-end services after wafer fabrication, not front-end wafer processing. |
These labels describe operating roles, not mutually exclusive boxes. To compare a company, ask whether it designs chips, operates wafer-fabrication capacity, manufactures its own products or customer designs, and handles back-end work itself or outsources it.
Why “fab vs. design company” is not always an either-or
Some companies specialize in design and rely on foundries; others combine design and manufacturing as IDMs. A company may also occupy more than one role or change how it describes its business over time.
TSMC: a foundry manufacturing customer designs
TSMC describes itself as a pure-play foundry: it says it manufactures customer products and does not design, manufacture, or market semiconductor products under its own name. In its 2024 reporting, TSMC said it manufactured 11,878 different products using 288 distinct technologies for 522 customers. Those are company-reported figures for 2024, not timeless measures of scale. TSMC company profile
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Intel: roles can overlap
In an April 2024 announcement, Intel described itself as both a semiconductor manufacturer and a fabless technology leader, and identified Intel Foundry as an operating segment. That dated description illustrates why a company should not always be reduced to a single label; structures and terminology can evolve. Intel’s April 2024 announcement
OEMs: designing chips for their own products
An OEM may design a chip for its own phone, car, or data-center product without owning the fab that manufactures it. This is another route beyond the familiar fabless-company-versus-IDM comparison. In a 2023 regulatory filing, the SIA estimated that OEMs accounted for less than 2% of design-related value added. That is the association’s estimate in that filing, not a current market-share figure. SIA’s 2023 regulatory filing
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the labels do—and do not—tell you
“Fabless” does not mean a company has no role in chip manufacturing; it means it lacks or has limited wafer-fabrication capability and contracts that work to a foundry. “Foundry” does not mean the factory itself, and foundries are not limited to serving fabless companies. “IDM” indicates a combination of design and manufacturing, but does not specify that every production step takes place in-house.
The SIA’s 2023 filing estimated that fabless companies represented about 47% of design-related value added and IDMs about 51%. These are the association’s estimates for design-related value added in that filing—not market-share figures, revenue shares, or current measurements. SIA’s 2023 regulatory filing
The simplest accurate distinction is by activity: chip designers create the design, fabs fabricate integrated circuits on wafers, and assembly, testing, and packaging prepare dies for use. A single company can perform more than one of those jobs.
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