Fabless

Notes

Enabled by the rise of pure-play foundries from 1987; Nvidia, Qualcomm, Broadcom and AMD all operate this way.

Overview

Fabless is a business model in which a chip company designs and sells semiconductors but owns no wafer fabrication plant, buying fabrication from foundries and assembly, packaging and test from outsourced assembly and test (OSAT) companies. The company spends its money on research and design rather than on factories. Logic chips in particular are now largely designed by fabless firms.

How it works

A fabless company defines a product, designs and verifies it with EDA tools and licensed IP, and sends the finished layout to a foundry at tapeout. The foundry makes the masks and processes the wafers, an OSAT assembles, packages and tests the chips, and the fabless company sells the result under its own name. It keeps responsibility for the product: specifications, test strategy, quality, supply planning and customer support.

The model grew alongside the foundry industry. TSMC, established in 1987, says it pioneered the pure-play foundry model, focused only on manufacturing its customers' products. As manufacturing grew more capital intensive and design more R&D intensive, fewer firms could fund both, and the fabless model expanded from the 1990s, according to a 2021 report by Boston Consulting Group and the Semiconductor Industry Association (SIA).

The economics differ sharply from those of an integrated device manufacturer (IDM). The same report puts fabless firms' R&D at about 20 per cent of revenue and capital spending at about 4 per cent over 2016 to 2019, against 14 and 20 per cent for IDMs. The cost of that light balance sheet is dependence: a fabless company relies on foundry capacity, pricing and process roadmaps it does not control, and must manage quality and supply across several partners. Some IDMs adopt a hybrid fab-lite model, keeping some fabs while outsourcing part of their production.

Examples

• A start-up designing an AI accelerator, taping it out at a foundry and having it packaged and tested by an OSAT, without owning any manufacturing equipment.
• A large fabless graphics or processor company negotiating foundry wafer allocation for a new product, because it cannot add capacity of its own.
• An IDM moving part of its production to foundries while keeping its own fabs for other products, an arrangement often called fab-lite.
• A fabless start-up proving its first design on a shared multi-project wafer run before committing to a full mask set.

Why it matters

The fabless model lowers the barrier to starting a chip company, since no factory is needed, but moves the main risks to design cost, foundry access and supply chain management. Founders, operations managers, foundry account teams, wafer buyers and finance leads at fabless firms deal with these questions every day.

In the chip lifecycle, a fabless company owns architecture, design, verification and tapeout, hands fabrication and assembly to partners, and remains responsible for test strategy, qualification, customer support and end of life.

It matters most to: Chip Startup Founder and CEO, Fabless Startup Finance Lead, Fabless Startup Operations Manager, Foundry Customer Business Manager, Silicon Supply and Wafer Buy Manager

Common confusions

Not the same as foundry

A foundry manufactures wafers for other companies. A fabless company is one of its customers and owns the design and the product. Fabless vs foundry

Not the same as fab-lite

A fab-lite company still runs some fabs of its own and outsources the rest. A fabless company runs none.

Not the same as IDM

An integrated device manufacturer designs, fabricates and often assembles and tests its chips in-house, a model that remains common for memory and analogue products. Fabless vs IDM

Key figures

• Almost 30 per cent Share of total semiconductor sales accounted for by fabless firms in 2019, up from less than 10 per cent in 2000. (Source: Strengthening the Global Semiconductor Supply Chain in an Uncertain Era (Boston Consulting Group and SIA, April 2021), 2026-10-22)

Sources

1. Strengthening the Global Semiconductor Supply Chain in an Uncertain Era (Boston Consulting Group and SIA, April 2021) (opens in a new tab), Semiconductor Industry Association, 2026-10-22
2. Company Info (opens in a new tab), TSMC, 2026-10-22
3. Fabless manufacturing (Wikipedia) (opens in a new tab), Wikimedia Foundation, 2026-10-22

Related terms

• Foundry
• IDM
• OSAT
• NRE
• Fab-lite
• Tape-out

Where it appears on the Hub

Used on 19 pages of the Hub. In each group, the pages that mention it most come first.