Lead and Paddle Delaminations

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.

Lead and Paddle Delaminations

SOJ Lead and Paddle Delaminations - Application Note 2250

Lead and Paddle Delaminations

Sample & Method

An SOJ imaged on C-SAM, with gating at the die, lead frame and paddle depths.

Result

Both the die paddle around the die and the inner lead fingers are delaminated (red areas). The pattern of lead finger delamination suggests two possibilities for this condition: 1) there is some type of contamination on the inner lead fingers; or 2) a type of finish that is not compatible with the molding compound was used on the inner lead fingers.