Equipment Standard
Industry specifications published by Semiconductor Equipment and Materials International define standard terminology and operational states for measuring manufacturing equipment performance. In semiconductor and advanced packaging facilities, semi E10 standard establishes consistent categories for tracking equipment operational time, downtime and maintenance performance. Six fundamental equipment states categorize all total electrical and mechanical uptime hours: productive time, engineering time, standby time, unscheduled downtime, scheduled downtime and non-operational time.
Tracking factory equipment through these defined operational states provides transparent efficiency metrics across high-volume automated processing lines. Standardized reporting allows assembly facilities to measure overall equipment effectiveness and identify machine bottlenecks without ambiguity.
Time Allocation
Equipment status tracking software records state transitions automatically via SECS/GEM interface protocols on automated tools. Productive time measures periods when tools perform intended processing operations on production wafers or substrate panels. Unscheduled downtime begins the instant a machine experiences a operational fault or safety interlock trip, continuing until maintenance personnel complete repair and qualification steps.
Scheduled downtime includes preventive maintenance and routine calibration procedures planned in advance.
Availability Metric
Mean time between failures and mean time to repair calculate directly from time logs defined by the standard guidelines. Contractual equipment performance guarantees between automated tool vendors and packaging foundries rely on these standardized calculations. Acceptance testing for new processing equipment requires reaching specified availability thresholds during initial production ramp phases.
