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Alignment deficiencies at SOT23

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Description:
This slightly twisted component has to be reworked, since there is no correctly wetted solder fillet at the lower lead.

Causes/Remedy:
  • placing faults: teaching, tolerances, systematic faults
  • floating of components during reflow process
  • vibration during soldering


Source: SEM
Alignment fault of a SOT23

Description:
Faulty alignment of SOT23 after placing. The overhang which can cause soldering defects is clearly visible. Rework is easy in this case, as the components have not been reflow-soldered yet.

Causes/Remedy:
  • placing faults: teaching, tolerances, systematic faults
  • floating of components during reflow process
  • vibration during soldering


Source: visual, optical inspection - general view
Faulty alignment of a SOT23
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