The Semiconductor Supply Chain
The Semiconductor Supply Chain
A chip's journey from design to your phone spans multiple countries and 6+ months:
- Design: Typically in the U.S., Israel, or UK (Apple in Cupertino, ARM in Cambridge)
- Wafer fabrication: Primarily in Taiwan (TSMC), South Korea (Samsung), or the U.S. (Intel)
- Materials & chemicals: Japan, Germany, U.S. supply photoresists, gases, and specialty chemicals
- Equipment: Netherlands (ASML), U.S. (Applied Materials, Lam Research), Japan (Tokyo Electron)
- Assembly & test (OSAT): Often in Malaysia, China, Vietnam, or the Philippines
- System integration: China (Foxconn, Pegatron) assembles final products like iPhones
Key Concept: Cycle Time
From start of wafer fabrication to a chip inside your phone takes roughly 4–6 months: 2–3 months in the fab, 2–4 weeks for packaging/test, and weeks for logistics and system assembly. Design time adds another 2–4 years before that.
Yield and Cost
Yield and Cost
Yield — the percentage of working dies per wafer — is the critical metric that determines chip economics:
- A 300mm wafer costs $5,000–$20,000+ to process at an advanced node
- At 95% yield on a small die, almost every chip works — great economics
- At 50% yield on a large die, half the chips are scrapped — very expensive
This is why yield engineering is so critical, and why ML/data science skills are in high demand in semiconductor fabs. Predicting and improving yield directly translates to millions of dollars saved.
Analogy: The Cookie Cutter
Imagine baking a giant cookie sheet (the wafer) and cutting out individual cookies (dies). Any burned spots or dough imperfections ruin those cookies. The bigger each cookie, the more likely it overlaps a flaw. Smaller cookies = higher yield, but you need more cookies for a full meal (chiplets!).
Knowledge Check
Knowledge Check
1 / 2How long does it typically take from wafer fabrication start to a chip in a device?