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72 SMT Magazine • February 2015 500 Hour Inspection Interval No tin whiskers were observed on the connectors at the 500 hours inspection inter- val. Figure 7 and Figure 8 illustrates the typical observed condition of a connector leads. 1500 Hour/Cycle Inspection Interval One tin whisker was observed on the 540 individual leads inspected at the 1500 hours interval. The tin whisker observed was approximately 20 microns long and had a very contorted shape. The tin whisker was observed in a region where solder would flow during the automated reflow process (7 and 8). TIN WHISKer rISK aSSeSSMeNT OF a TIN SurFaCe FINISHed CONNeCTOr continues Feature Figure 5: no tin whisker observed at 500 hours. Figure 7: Single tin whisker observed at 1500 hours. Figure 6: Typical connector observation at 500 hours.