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Lead Frame Contamination
Figure 1.
Lead Frame Contamination
Contamination
of fresh lead frames can result in field failures, which is why incoming
lead frames must be subjected to quality assurance inspection prior to
use in production.
Figure
1 shows low-magnification (left) and high-magnification (right) SEM photos of
contaminants on the lead finger of a fresh lead frame.
EDX analysis
needs to be performed on samples such as this to identify the elements
present in the contamination. The presence of foreign elements
such as Cl, S, and P can lead to corrosion, and must therefore be
considered as a possible ground for rejecting the affected batch of
samples.
See Also:
Internal Contamination
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