Tin Whisker Management Guidelines, Part 2

摘要

Sample size. To ensure a consistent plating process, testing should be done on three different plating finish lots, with different date codes and plated at least one week apart, or plated on different plating lines. The final sample sizes recommended were a tradeoff to accommodate user needs without being an excessive burden to suppliers. TABLE 3 (online) shows iNEMI recommendations for number of samples and sample preparation. The proposed JESD 201 modifies the sample sizes slightly. Preconditioning. Preconditioning samples prior to test condition exposure helps simulate actual use conditions. Three different preconditions are recommended. The two reflow conditions (described below) require an initial four weeks at ambient.