FLIP CHIP UNDERFILL: VOID DETECTION AND CORRECTIONAuthor: Kris Slesinger et al.
Company: Solectron Technology
Date Published: 9/22/2002 Conference: SMTA International
The engineering team designed a series of experiments to identify the failure mechanism. Test hardware was then assembled and subjected to a variety of standard and novel analysis methods to determine the root cause of voiding. The results indicated that the customer requirement for printed circuit board (PCB) pre-bake was insufficient - apparently due to modifications to the board fabrication process. Corrective actions with the customer and board suppliers were then implemented to restore production quality to expected levels.
Acoustic microscopes can be used for non-destructive void detection (Figure 2), however most equipment cannot keep pace with a high-volume assembly line. So it’s critical to fully develop the dispense process and characterize each particular product before volume production begins. Then acoustic scanning and/or other inspection methods can be used for offline periodic monitoring.
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