Issue link: https://iconnect007.uberflip.com/i/1067105
JANUARY 2019 I SMT007 MAGAZINE 83 Group 2 IC Results The IC results for Group 2 shows lower levels of most ionics, but most are still above the recommended limits. In particular, the acetate, lithium, and sodium ions are still at a level that will increase the risk of failure in a normal field service environment. Group 2 SIR Results All locations with components failed both the SIR criteria as well as the recommended IC limits. The header (non-populated) area did pass both SIR and IC testing due to the lack of thermal mass. Thermal Profile Group 3 The manufacturer recommends a maximum ramp of <2° per second with a dwell time of between 30–90 seconds at peak temperature. For this study, a peak temp of 250° and a dwell time of ~60 seconds was chosen. The profile is seen in Figure 7, IC results in Table 3, and SIR results in Figure 8. Group 3 IC Results The manufacturer recommended profile renders all of the flux activators benign in the areas tested with and without components. Looking at the profile for Group 3, all of the Table 2: IC data for Group 2. Figure 6: SIR results for Group 2.