How organic substrate structure & design improve assembly robustness

This paper focuses on how the PBGA (plastic ball grid array) organic substrate structure and traces design improve the assembly packaging robustness. Via plugging process at the substrate fabrication has been studied. Comparison of substrate without via plug, laminate substrate with via plugging process increases the overall hardness of the substrate. This is due to the via plug materials use (IR6) is a harder materials than the solder resist. Another area of study is the addition of dummy traces design on the air venting area improves the solder resist evenness by elimination mold resin bleed.