How to build preventive maintenance schedules and PM kits for legacy 200mm fab tools — interval logic, wet-clean cadence, consumables and downtime planning.

OEE for semiconductor equipment is availability × performance × quality, defined by SEMI E10. Here is the six-state model, a worked OEE calculation, MTBF vs MTTR, legacy-fab benchmarks and a tracking template you can use immediately.

Wafer-fab uptime is raised by lifting equipment availability through three levers — higher MTBF, lower MTTR and disciplined PM backed by ready spares. This playbook gives the metrics, benchmark targets and concrete actions for legacy 200mm fabs.

A fab engineer’s guide to semiconductor equipment repair and refurbishment: repairable assemblies, turnaround benchmarks, acceptance testing, warranty terms and a SEMI E35 repair-vs-replace cost model for legacy 200mm tools.