What it means
Fab is short for fabrication plant, the highly specialised factory where silicon wafers are turned into finished chips. A leading edge fab costs many billions of dollars and becomes technologically obsolete within a few years, which explains why so few companies own one.
The fabless model splits the industry in two. Designers concentrate on architecture, software and customer needs while foundries concentrate on manufacturing at scale, and each side can direct its capital at what it does best.
Financially the difference is dramatic. A fabless designer typically spends 2% to 4% of revenue on capital expenditure and 20% to 30% on research and development, whereas an integrated manufacturer running its own fabs can spend 20% or more of revenue on capital expenditure alone.
The trade-off is control. A fabless firm depends on foundry capacity it does not own, so when demand spikes it competes with every other customer for wafer allocation, and when a foundry's process technology slips the designer's product roadmap slips with it.
The model has spread well beyond chips. Fashion brands, consumer electronics firms and food companies use much the same structure, keeping design, brand and distribution in house while outsourcing production, and the same dependency risks apply to all of them.
Investors judge these businesses on different measures as a result. Return on invested capital and research spending as a share of revenue matter far more than factory utilisation or unit cost, and a fabless firm that stops investing in design is running down the only asset it actually owns.
In practice
Real-world examples.
Example
A designer of power management chips for electric vehicles employs 400 engineers and no production staff at all. It buys all its wafers from two foundries in different countries specifically to reduce concentration risk, accepting a slightly higher unit cost in exchange for continuity of supply.
Example
A start-up designing an artificial intelligence accelerator raises $80,000,000 and spends none of it on plant. The money goes instead on engineering salaries, design tool licences and a $9,000,000 prepayment to secure foundry capacity, which the investors treat as the single most important line in the budget.
Example
An established manufacturer with ageing fabs decides to go fabless, selling its plants to a foundry operator and signing a long term supply agreement. The move converts a large fixed cost base into a variable one but hands pricing power to the buyer.
Formula
Calculation
Gross margin = (revenue - manufacturing cost) / revenue
Capital intensity = capital expenditure / revenue
A fabless chip designer records revenue of $600,000,000. Payments to its foundry, plus packaging and testing, come to $240,000,000, so gross profit is $600,000,000 - $240,000,000 = $360,000,000 and the gross margin is $360,000,000 / $600,000,000 = 60%.
Research and development takes $180,000,000, or 30% of revenue, and general and administrative costs a further $90,000,000, leaving operating profit of $360,000,000 - $180,000,000 - $90,000,000 = $90,000,000, a 15% operating margin. Capital expenditure is only $12,000,000, or 2% of revenue, whereas an integrated rival owning its own fab might spend 20%, or $120,000,000, ten times as much to support the same sales.Case study
Seen in the real world.
The following is an illustrative and entirely fictional example. Torrey Ridge Silicon, an invented designer of networking chips, grew revenue to $85,000,000 at a 58% gross margin, worth $49,300,000, without ever owning a factory. Its board treated foundry supply as a purchasing matter rather than a strategic one.
When global demand for wafers surged, the foundry cut Torrey Ridge's allocation by 30%. The fictional company could ship only $59,500,000 of product, so gross profit fell to $59,500,000 x 0.58 = $34,510,000, a drop of $14,790,000 in a year when the order book had never been fuller.
The response was to sign a three year capacity agreement backed by a $14,000,000 prepayment, effectively buying a permanent place in the queue. In this illustrative case the lesson was that the fabless model does not remove manufacturing risk, it converts that risk into supplier concentration, which has to be managed with contracts rather than with capital spending.
Watch out
Common mistakes.
- Assuming fabless means asset light in every sense, when design tool licences, intellectual property and foundry prepayments tie up serious amounts of money.
- Treating foundry supply as a routine procurement decision rather than the single biggest operational risk in the business.
- Comparing a fabless company's margins directly with an integrated manufacturer's without adjusting for the capital each one employs.
Questions
People also ask.
What is the difference between a fabless company and a foundry?
The fabless company designs the chip and owns the intellectual property, while the foundry owns the factory and manufactures to the designer's specification.
Is the fabless model cheaper?
Per chip it is often more expensive, because the foundry needs its own margin, but it avoids billions in capital expenditure and the risk of owning an obsolete plant.
Can a company be partly fabless?
Yes, and many are, keeping older or specialised processes in their own plants while sending leading edge work to external foundries.
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