What Does Samsung Foundry Do? Korea's Contract Chip Maker Explained
Photo: Samsung Electronics Suwon.JPG by hyolee2 / CC BY-SA 4.0, via Wikimedia Commons
Related video: "Samsung Foundry vs TSMC" (via Asianometry)
The short answer: Samsung Foundry is a factory-for-hire. Companies like Qualcomm and Nvidia design chips on computers but own no factories of their own. They send those designs to a "foundry" — a contract chip manufacturer — which physically produces the silicon. Samsung Foundry is one of only a handful of companies on Earth that can do this at the most advanced level.
That's it. That's the business. The complicated part is why this arrangement exists, why Samsung is unusual among foundries, and why governments now treat this industry as a national security issue.
Designing a chip and making a chip are completely different jobs
Here's the mental model that unlocks everything else. In the chip world, the company whose logo appears on a product usually didn't build the silicon inside it.
There are three business models:
- Fabless — designs chips, owns no factory. Apple, Qualcomm, Nvidia and AMD all work this way. They produce design files and hand them off.
- Foundry — a contract chip factory. It sells manufacturing, not branded chips. Samsung Foundry and TSMC are the big names here.
- IDM (integrated device manufacturer) — designs and manufactures its own chips. Samsung's memory business works this way, as did Intel historically.
The easiest analogy: a fabless company is a fashion label. It designs the clothes, puts its name on the tag, and runs the marketing. A foundry is the garment factory that stitches for dozens of labels at once, often in the same building. Nobody walks into a store and buys a "foundry chip" — you buy a phone with one inside.
Why not just build your own factory? Because a leading-edge chip fab can cost tens of billions of dollars and depends on lithography machines that essentially one supplier in the Netherlands makes. Almost no company can justify that spending. Outsourcing to a foundry is the only rational option for most of the industry.
What a foundry physically does
A foundry takes polished silicon discs called wafers and builds billions of microscopic transistors onto them, layer by layer, using light to print patterns. Then it cuts the wafer into individual chips and packages them — wrapping them in protective material with electrical connections so they can be soldered into a device.
Two pieces of jargon you'll see everywhere:
"Nodes" — the numbers like 5nm, 4nm and 3nm. Treat these as generation labels, not measurements. A smaller number means a newer, denser generation that usually fits more transistors into the same area. It does not mean anything on the chip is literally 3 nanometres wide. Samsung's published portfolio spans older, cheaper processes such as 28FD-SOI through its 14/10/8/7/5/4nm FinFET generations up to 3nm and 2nm using gate-all-around (GAA) transistors, with extreme ultraviolet lithography used from 7nm onward.
"Yield" — the share of chips on a finished wafer that actually work. This is arguably the single most important number in the foundry business, and the one most articles skip. A wafer costs roughly the same whether 90% or 50% of its chips are functional, so yield directly determines cost per working chip. A foundry can have impressive technology on paper and still lose contracts because its yield makes customers' products too expensive.
Samsung Foundry's timeline: a deliberate second act
Samsung isn't a foundry that grew into memory. It's the opposite, and the order matters:
| Year | What happened |
|---|---|
| 1974 | Samsung enters semiconductors by acquiring Hankook Semiconductor |
| 1983 | VLSI (large-scale integrated circuit) business begins |
| 2005 | Samsung enters the foundry business |
| 2017 | Samsung Foundry established as a separate third division |
Samsung first became globally dominant in memory chips — the DRAM and flash storage that holds data. Foundry work, which manufactures logic chips that do computation, came decades later.
The 2017 split is the date to remember. Carving the foundry out as its own division wasn't cosmetic reorganisation. It was Samsung signalling to potential customers that this was a real standalone business with its own walls, not a side gig run out of the memory group.
Most of what it makes isn't glamorous
Media coverage obsesses over the newest phone processors, but those are only a slice of foundry output. Samsung Foundry also runs specialty processes for the boring, high-volume stuff: CMOS image sensors (your phone camera), display driver chips, power management chips, fingerprint sensors, radio-frequency chips, high-voltage and automotive parts, and embedded memory technologies including eMRAM and an eFlash process Samsung says draws on more than 25 years of manufacturing experience.
Modern foundries also sell far more than the factory itself. Samsung's SAFE ecosystem programme provides verified design software, pre-tested building blocks (IP), a cloud design environment and ASIC design services. Samsung frames this as being a "Total Foundry" — meaning it wants to hand customers the whole toolkit needed to make a design manufacturable, rather than just quoting a price per wafer. For a small fabless startup, that kind of support is often the deciding factor.
Samsung vs TSMC: the honest comparison
This is the question everyone actually wants answered, so here's a straight take rather than diplomatic mush.
TSMC is a pure-play foundry. It designs no competing products. If you send TSMC your design, TSMC will never use it to build a rival phone. That neutrality is TSMC's core product, and it's a big part of why TSMC became the industry's default choice at the leading edge.
Samsung is a hybrid. It's a foundry and one of the world's largest chip designers, memory makers and consumer electronics brands — phones, TVs, appliances, plus its own Exynos processors. So a customer weighing Samsung has to ask an awkward question: am I handing my crown-jewel design to a company that also competes with me in the end market? Samsung's answer is organisational and contractual separation, which is exactly why the 2017 division split matters so much to its sales pitch.
Samsung's real advantages: it's simultaneously a giant memory manufacturer and a serious advanced-packaging player, with integrated 2.5D and 3D packaging options. That means it can pitch logic chips, memory and packaging from a single company — increasingly valuable for AI hardware, where stacking memory next to a processor is much of the game. Samsung also owns the full stack from silicon to finished phone, giving it an internal customer that helps keep its fabs busy.
My view: the industry genuinely needs Samsung to succeed here. A world where one company in Taiwan is the only viable source of advanced logic chips is a fragile world. Samsung being a credible second source gives customers pricing leverage, supply resilience and geographic diversification — and that's worth something even to buyers who ultimately choose TSMC.
Why this matters if you live nowhere near Korea
Advanced chip manufacturing is one of the most geographically concentrated critical industries on the planet. A handful of sites in Taiwan and South Korea produce much of the silicon that makes cars, phones, medical devices and AI data centres possible. The automotive chip shortage that began in 2021 showed what happens when that pipeline hiccups: assembly lines idled worldwide and vehicle prices climbed.
So when you read about Samsung Foundry chasing new customers or building fabs abroad, that isn't just corporate news. It's about whether the world has one point of failure or two.
FAQ
Does Samsung make its own chips, or other companies' chips?
Both, through different divisions. Samsung's memory business designs and sells its own branded chips. Samsung Foundry manufactures chips designed by outside customers. Samsung's System LSI division designs the Exynos processors — which Samsung Foundry then manufactures, making Samsung its own customer.
Is Samsung Foundry a separate company from Samsung Electronics?
No. It's a division inside Samsung Electronics' semiconductor business, established as a standalone third division in 2017. It isn't separately listed on a stock exchange.
What does "3nm" actually mean?
It's a marketing generation label, not a physical dimension. Lower numbers indicate newer processes that generally pack transistors more densely and use less power per unit of performance. Comparing node numbers across different foundries isn't apples-to-apples.
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