PBGA 3D Sectioned Voids
PBGA 3D Sectioned Voids in Molding Compound - Application Note 210
Sample & Method
The Acoustic Solid shown in Application Notes #202 and #206 has been sectioned in two geometric planes to reveal the die attach region and other internal features.
The die attach region (square blue area) shows some differences in acoustic intensity (light and dark blue), indicating variations in the die attach. The numerous small voids (yellow) in the molding compound, seen in Application Note #206, are also seen here.