Semiconductor Cost Economics is the analysis of fabrication, packaging, and testing costs that determine the price per transistor and price per die — where a single leading-edge fab costs $20-30 billion to build and a 300mm wafer costs $10,000-$20,000+ to process through 1000+ steps at advanced nodes.

Fab Construction Cost

Wafer Processing Cost

• Mature nodes (28nm): $2,000-$3,000 per wafer.
• 7nm: $8,000-$10,000 per wafer.
• 3nm: $15,000-$20,000 per wafer.
• Cost breakdown: Lithography (30-40%), deposition (15-20%), etch (10-15%), implant (5%), metrology (5%), other (10-15%).

EUV Lithography Cost Impact

• ASML EUV scanner: $150-200M per tool.
• EUV throughput: 150-200 wafers/hour (vs. 300+ for DUV).
• 3nm requires 20+ EUV layers — EUV lithography dominates wafer cost.
• High-NA EUV (0.55 NA): $350-400M per tool — pushes wafer costs higher at 2nm.

Die Cost Calculation

$Cost_{die} = \frac{Cost_{wafer}}{Dies_{per\_wafer} \times Yield}$

• 300mm wafer area: ~70,685 mm².
• Die size 100 mm² → ~600 gross dies per wafer.
• At 90% yield: ~540 good dies.
• $16,000 wafer → ~$30 per die at 3nm (before test and packaging).
• Large dies (600+ mm², GPU/AI): ~90 gross dies → after yield, $200-$500+ per die.

Cost Scaling Paradox

• Moore's Law historically reduced cost per transistor by ~30% per node.
• At 7nm and below: Cost per transistor INCREASING at some nodes.
• Reason: EUV cost, increased mask layers, more complex process steps.
• Economic response: Chiplet architectures — use advanced nodes only for logic, cheaper nodes for I/O and memory.

Packaging and Test Costs

• Advanced packaging (CoWoS, Foveros): $100-$500 per package.
• Test (ATE time at $5-10/minute): $2-20 per die depending on complexity.
• Total chip cost: Die + packaging + test + margin.

Semiconductor economics is the fundamental driver of technology decisions — the escalating cost of leading-edge fabrication is reshaping the industry toward chiplet architectures, heterogeneous integration, and strategic allocation of expensive advanced nodes only where they provide meaningful performance benefits.