Acoustic Microscopy Image SOJ Lead and Paddle Delaminations

Application Note 2250

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.

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