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Damaged components with plastic housing



Damaged LED / SOT23

Description:
Damaged plastic casing of a LED in the SOT23 housing. In most of the cases the damage is due to humidity contained in the plastic material which forms gases during the strong heating-up of the soldering process and damages the housing (popcorn effect). The cracks nearly always run along the seam between the top and bottom part of the plastic body. This phenomenon can be avoided through tempering of the components.

Causes/Remedy:
  • humidity escaping from the plastic material
  • deficiencies in the soldering process parameter


Source: visual, optical inspection - general view
damaged plastic housing of a LED

Damaged SOT23

Description:
same context as described above.

Causes/Remedy:
  • humidity escaping from the plastic material
  • deficiencies in the soldering process parameter


Source: SEM
damaged plastic casing of a SOT23
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