Issue link: https://iconnect007.uberflip.com/i/1288481
118 PCB007 MAGAZINE I SEPTEMBER 2020 Figure 11 is a report. If you just looked at the thermal shock on some coupons, and look to- ward the right, you will see yellow lines. The first two pairs of columns are how many cycles it went past 100 cycles. The requirement was 100 cycles. But when you did an OM test with reflow measuring, the resistance at reflow was followed immediately by thermal shock. The reason these are marked in yellow is that every one of the yel- low-marked tests failed during reflow in that the resistance went over the 5% threshold. If you just use the thermal shock, and if that is the only test you did, you would have de- clared all the parts as good. They passed ther- Figure 10: Examples of how thermal shock alone will pass coupons that fail at reflow. Figure 11: Same load from previous figure except these are reflow statistics.