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A semiconductor usually passes through several specialist stages before it becomes part of a phone, car, computer, or other electronic product. A company may design a chip, another may fabricate it on a wafer, and another may assemble, package, and test it. Some firms span multiple stages, so there is no single route that every chip follows—and no reason to assume one company or country controls the entire chain.
What is a semiconductor supply chain?
A semiconductor supply chain is the network of businesses, materials, equipment, software, and production steps that turns a chip concept into a packaged component ready for use in a larger electronic system. The main production sequence is design, wafer fabrication, and assembly, testing, and packaging (ATP). Packaged chips then move downstream for integration onto printed circuit boards and into finished products.
That sequence depends on suppliers beyond the firms that sell chips. Designers use specialized software and reusable circuit building blocks; fabs need wafers, gases, chemicals, and complex manufacturing equipment; and packaging operations rely on materials such as substrates and bonding wires. These inputs can come from still more suppliers, creating a multi-tiered network rather than a simple line between two companies.
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The stages are useful for understanding the work, but they are not rigid boundaries between companies. Business roles can overlap, a firm may outsource only selected steps, and the route differs by product. The key distinction is between the work a chip needs and the particular company—or companies—that perform it.
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How does a chip move from design to a finished component?
1. Design defines what the chip must do
Chip design translates a product or system requirement into a circuit design. Designers decide what functions the chip should provide and how its circuits will be organized. Design is not simply a matter of drawing a circuit in one program: the design must be compatible with the manufacturing process that will eventually produce it.
Three important design inputs are electronic design automation (EDA) tools, intellectual-property (IP) cores, and process design kits (PDKs). EDA tools help engineers create and work with chip designs. IP cores are reusable functional blocks that can be incorporated into a design. A PDK provides information and resources for designing with a particular manufacturing process. Together, they connect design work to the capabilities and requirements of fabrication.
2. A wafer is processed layer by layer
Front-end manufacturing, commonly called wafer fabrication, creates circuit patterns on a semiconductor wafer. Rather than producing a finished, individually handled chip at the outset, a fab processes patterns across a wafer through repeated manufacturing steps. The wafer may be silicon or another substrate material.
At a simplified level, the process includes polishing, deposition, applying a resist, lithography, etching, ion implantation, and removing the resist. These operations are repeated to form the intended structures. Lithography defines patterns; etching removes selected material; deposition adds material; ion implantation introduces dopants; and polishing helps prepare or planarize surfaces. The exact sequence and number of operations depend on the manufacturing process, so this list is a guide to the kinds of work involved rather than a universal recipe for every chip.
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Fabs use specialized equipment for lithography, resist processing, metrology and inspection, etching, deposition, cleaning, and chemical-mechanical planarisation (CMP). They also consume inputs such as substrate wafers, electronic gases, wet chemicals, photoresists, and CMP materials. Fabrication therefore depends both on the fab’s production capability and on the availability of appropriate tools and consumables.
3. Dies are assembled, packaged, and tested
After wafer fabrication, the wafer is cut into individual dies. ATP operations assemble and package those dies so they can connect to a larger electronic system, and test them for defects and performance. Packaging materials can include lead frames, substrates, bonding wires, and die-attach materials.
Packaging is not merely a protective shell added after the important work is over. It is a manufacturing stage that establishes how the die connects to the rest of the system, while testing checks whether the resulting component meets relevant requirements. The packaged chip can then be used downstream in printed circuit board assembly and a finished product.
4. Advanced packaging can combine chips
Some packaging approaches integrate multiple functions at the package level. Heterogeneous integration can place chiplets or multiple integrated circuits in one package; vertical stacking can use through-silicon vias (TSVs) to connect stacked dies. These methods can support greater transistor density at the package level and combine a wider mix of functions in one package.
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Those are potential capabilities, not a guarantee that every advanced package will be more efficient or suitable for every product. What matters for the supply-chain picture is that package design and manufacturing can shape how multiple dies work together, adding another technically important stage after wafer fabrication.
Which companies handle each stage?
Industry labels describe business models, not exclusive boxes. A firm can combine roles, outsource some operations, or perform different roles for different products. The table shows the typical focus of each model, not a mandatory route every chip follows.
| Business model | Typical role in the chain |
|---|---|
| Fabless company | Designs chips and outsources manufacturing to foundries; typically sells chips without operating its own wafer fab. |
| Foundry | Operates fabs to manufacture semiconductors for other firms on a contract basis. |
| OSAT provider | Provides outsourced assembly and test services, typically for fabless, system, and integrated-device firms. |
| Integrated device manufacturer (IDM) | Can perform several stages, from design through packaging, while also outsourcing selected stages or providing contract manufacturing. |
| System firm | Designs chips for use in its own products or services and typically relies on foundries and OSAT providers for production. |
A common simplified route is a fabless designer handing a design to a foundry, followed by wafer processing and an ATP provider’s packaging and test work. But the labels do not prove that this exact sequence applies to a particular chip. An IDM may handle several stages internally; a system firm may design for its own products; and companies can combine manufacturing or packaging roles. To understand a specific participant, ask which stage and product are in view rather than relying on a single company-wide label.
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Wafer fabrication is the most capital-intensive stage of semiconductor manufacturing, according to the OECD’s overview. It requires specialized equipment and tightly controlled production operations, as well as a continuing supply of process materials. The scale of equipment spending illustrates the industrial weight of this stage: the OECD’s 2025 overview reports, citing SEMI, that the global semiconductor manufacturing equipment market was around USD 139 billion in 2024. That figure is for equipment market size, not the value of all semiconductor production or a measure of fab construction alone.
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Capital intensity helps explain why companies specialize. A chip designer can focus on circuit design without operating a fab, while a foundry can manufacture for multiple customers. Contract manufacturing allows a company to access production capability without owning every facility and tool involved. The trade-off is dependence on external capacity and on the suppliers that keep the manufacturing process equipped and supplied.
Why do supply chains span countries and companies?
Semiconductor production draws on specialized capabilities distributed across firms and regions. Design tools, IP, process knowledge, wafer production, fabrication equipment, chemicals, and packaging inputs are distinct parts of the wider ecosystem. A country may have an important role in one portion of the chain without carrying out every stage or producing every input.
The Semiconductor Industry Association describes semiconductor supply as multi-tiered and geographically dispersed. It says production can take months and requires materials, equipment, and components from several supplier layers. One statistic needs careful interpretation: the association reports that 95% of roughly $27 billion in equipment and materials consumed by semiconductor players in the United States is sourced from suppliers headquartered in the United States, Europe, and Japan. This concerns U.S. consumption and supplier headquarters; it does not say that 95% of those inputs are manufactured in those places, nor does it describe the global industry’s sourcing pattern.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsSupplier headquarters and factory locations answer different questions. A supplier may be headquartered in one region while manufacturing inputs in multiple places. Likewise, a firm operating in one stage does not necessarily control upstream equipment or materials. This separation makes a supply-chain map more informative when it identifies the stage, product category, year, and whether it describes company headquarters, manufacturing capacity, or actual production.
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What does a real company example show?
TSMC’s 2024 annual report illustrates how a company can occupy a major but defined position in the chain. The report describes TSMC’s pure-play foundry model and its work in advanced packaging and 3D stacking, including CoWoS, InFO, and SoIC. These activities demonstrate that foundry manufacturing and advanced packaging capabilities can be associated with the same company, rather than always being split across separate businesses.
For 2024, TSMC reported 12.9 million 12-inch-equivalent wafer shipments. It also said it manufactured 11,878 products for 522 customers using 288 process technologies. Those are company-reported, year-specific figures describing TSMC’s own operations; they are not totals for the semiconductor industry and do not establish the scale or structure of other firms’ supply chains.
Where are the main vulnerabilities?
Dependence on specialist suppliers can make a distributed chain vulnerable to disruptions at more than one point. A delay in equipment, a shortage of a process material, or a constraint at a manufacturing or packaging stage can affect downstream availability. The multi-month production timeline described by the Semiconductor Industry Association underscores why a disruption cannot necessarily be resolved simply by moving a finished chip from one supplier to another.
Specialization and geographic concentration are related but distinct risks. Specialization means that a stage or input requires capabilities that not every supplier can provide. Concentration means that capacity is clustered among relatively few locations or participants. The UK National Semiconductor Strategy discusses both as sources of vulnerability. It also cites regional-capacity figures from a 2021 BCG/SIA report; those figures are historical and depend on the chip category, so they should not be treated as current capacity estimates without updated evidence.
Packaging belongs in a resilience discussion alongside fabrication. Chips need assembly and testing before end-use integration, and packaging operations rely on specialist materials and equipment. A supply-chain assessment that counts wafer fabs but ignores ATP can miss a separate point of dependence.
How to read claims about semiconductor leadership
There is no single defensible ranking of countries or companies across the whole semiconductor chain. A claim about leadership may refer to design, EDA tools, IP, wafer fabrication, a particular process technology, assembly and packaging, equipment, or materials. It may also refer to headquarters, installed capacity, production location, or a specific year.
- Identify the stage: design, fabrication, ATP, equipment, or materials.
- Check the business role: fabless, foundry, OSAT, IDM, system firm, or supplier.
- Note the product or technology category and the year behind any capacity figure.
- Distinguish where a company is headquartered from where its products are manufactured.
- Keep company-reported figures separate from industry-wide measurements.
These distinctions explain why statements such as “one country makes all the chips” or “one company controls the supply chain” are usually too broad unless they specify exactly which chip category, stage, measure, and date they mean.
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