PDIP Delaminations on the backside

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.

PDIP Delaminations on the backside

PDIP Delaminations on the backside - Application Note 1053

Delaminations on the backside
Acoustic image of a PDIP showing delaminations (red)

Sample & Method

This PDIP (Plastic Dual In-line Package) was imaged at 15 MHz from the back side of the package. Gating was on the interface between the molding compound and the lead frame and paddle.

Result

The small red areas are delaminations between the back side of the lead fingers and the molding compound. Delaminations in these areas encourage the collection of moisture and contaminants and the initiation of corrosion.