Capacity planning is the process of determining required manufacturing capability to meet future demand within target service and cost constraints - it guides capital investment, staffing, and equipment deployment decisions.

What Is Capacity planning?

• Definition: Forecast-driven analysis of required tool hours, workforce, and infrastructure by planning horizon.
• Planning Inputs: Demand scenarios, process times, yield assumptions, uptime, and cycle-time targets.
• Decision Outputs: Tool purchase timing, expansion plans, outsourcing choices, and load-shift strategies.
• Lead-Time Challenge: Long equipment procurement cycles require early decisions under uncertainty.

Why Capacity planning Matters

• Supply Assurance: Under-capacity leads to shortages, backlog growth, and missed commitments.
• Capital Efficiency: Over-capacity drives low utilization and margin pressure.
• Strategic Timing: Correct timing of expansion is critical in cyclical semiconductor markets.
• Risk Reduction: Scenario-based plans improve resilience to demand shocks and yield changes.
• Execution Stability: Feasible capacity baseline reduces firefighting in daily operations.

How It Is Used in Practice

• Scenario Modeling: Evaluate base, upside, and downside demand with sensitivity to key constraints.
• Bottleneck Focus: Prioritize capacity actions at true constraint tool groups.
• Rolling Reforecast: Update plans regularly as demand, yields, and tool performance evolve.

Capacity planning is a high-stakes strategic function in fabs - accurate forward capacity decisions are essential to balance service reliability, profitability, and long-term competitiveness.