A semiconductor shortage occurs when demand for chips exceeds available supply, causing extended lead times, allocation, price increases, and production disruptions for downstream customers.

The 2020-2022 Chip Shortage

The most severe shortage in semiconductor history was triggered by COVID-19 pandemic effects: (1) Sudden demand surge for PCs, servers, and consumer electronics as people worked/learned from home. (2) Automotive OEMs cancelled orders early in COVID, then couldn't get capacity back when demand recovered. (3) Supply chain disruptions (factory shutdowns, logistics delays). The shortage lasted ~2 years and cost the auto industry alone an estimated $200+ billion in lost production.

Why Shortages Happen

Long lead times: Building a new fab takes 2-3 years and costs $5-20+ billion. Capacity can't respond quickly to demand spikes. Demand volatility: End-market demand can shift suddenly (crypto mining, AI boom, pandemic). Concentration: A few companies (TSMC, Samsung) control most advanced capacity. Cascading effects: Missing one $1 chip can hold up a $50,000 car.

Shortage Impact

• Customers: Extended lead times (from 8-12 weeks to 40-50+ weeks), forced to redesign products around available chips • Pricing: Spot market prices for some chips rose 5-10× above list price • Auto industry: Millions of vehicles unbuilt due to missing chips • Foundries: Record revenue and profits from strong pricing and full utilization

Structural Changes Post-Shortage

Governments enacted CHIPS Act (US: $52B), EU Chips Act (€43B), and similar programs to diversify and expand semiconductor manufacturing. Companies shifted from just-in-time to just-in-case inventory strategies.