Acoustic Microscopy Image Plastic BGA - Q-BAM acoustic cross-section

Application Note 2596

This BGA was first imaged in planar mode by C-SAM (bottom half of image). Along the white line drawn across the planar image, a cross-sectional Q-BAM image was then made (top half of image).

Result

Gating in the planar image was at the interface between the molding compound and the substrate. The vertical white structures in the planar image are delaminations between the molding compound and the substrate.

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