Production control system to integrate lot-level and mass volume production dispatching rules for output optimization in a Wafer Fab

In a pure foundry wafer fab, on-time delivery at lot level is a very important Key Performance Index (KPI) in both operations and business aspect. The characteristic of a foundry wafer fab is high volume, very rich and diversified product mix. The Customer base is usually large. The line dispatching rule is usually build based upon the principle of on-time delivery (OTD) at individual lot level. In this paper, we present a real situation where a traditional pure foundry fab is being loaded with a substantial portion of production lots which highly resemble the characteristic of mass volume production devices. Under this scenario, the global dispatching rule is put to challenge as it was originally lot-level on-time delivery driven. This does not serve the mass volume production devices well.