Process control of the lead scanning process [IC packages]

The process flow of a scanner was thoroughly looked at. The process flow revealed that accuracy, repeatability, and handling of the parts are the key elements. Through research it was also determined that GR&R and design of experiments were necessary to optimize the scanner parameters. It was also determined that physical handling of the parts created more rejects. Therefore, for performing quality control gates we used full tube or tray quantities to eliminate the human factor. This drove the quality to new highs. There was also automation added to the existing scanners, but before releasing to production the key elements were thoroughly characterized. The SPC charts were also custom-made for the new scanner based on the confidence level of the modified machine. Initially, the frequency was high, but with statistical data, it was eventually back to normal conditions