43

Poor Wetting
The solder joints on the IC are satisfactory with good fillets. The visual appearance of the leads are poor due to loss of the tin plating. Although the exposed leads will oxidise and are not likely to cause problems, the visual appearance will probably require the parts to be removed. The loss of plating is due to poor initial plating probably during the preparation of the base lead frame prior to tin/lead coating. Loss of the coating is often seen at the lead to plastic interface due to mould flash contaminating the lead frame.