Determining optimal lot-size for a semiconductor back-end factory

Modeling analysts are using a methodology that applies queuing theory logistics laws and simulation to factory performance analysis. These methods are being applied at semiconductor back-end factories, where a major focus is on achieving capacity increases with minimal equipment additions. This paper describes this technical methodology and investigates an optimum lot-size for back-end factories based upon given throughput and cycle time targets. The analysis provides a recommended lot-size of 6800 for the overall production area, allowing the factory to maximize throughput while still meeting overall factory cycle time goals. The model indicates a potential 14% increase in throughput by selecting the optimal lot-size