C-SAM and Q-BAM

Pictured

Time Domain Imaging (TDI)™
Utilizes an echo (amplitude & polarity) arrival ‘time’ as a reference, such as standard A-Scan, B-Scan and C-Mode type images.

C-SAM and Q-BAM

Plastic BGA - Q-BAM acoustic cross-section - Application Note 2614

C-SAM and Q-BAM

Sample & Method

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.