Issue link: https://iconnect007.uberflip.com/i/1428512
NOVEMBER 2021 I PCB007 MAGAZINE 31 Partida: at's correct. I'm trying to help them understand that this is what we see. In other words, "If we try to do this, it's not going to work. Our experience and tools say it's not going to work. It's based on science." And it sounds like, well, this is magical. You put this information in, and it will tell you it will not work, but how do you know that it's going to work in the real world? I have two years of D Coupon testing data. I'll give you an example: 47 net, 47 failed, one passed. Our data said, "It will fail at 3.1 reflow cycles." e OM tester will tell you that one reflow cycle, I might fail that." I put in the spreadsheet, every net at what refill cycle to fill it at. Our output says 3.1 reflows to failure; when I averaged out the 47 failures, it came out to 2.95 reflows to failure. Johnson: at's pretty accurate. If you get enough of those examples, you start to really trust the analysis. is starts to change the traditional test and inspection dynamic. You're moving away from having to inspect and test what you've done and, instead, mov- ing into, to use a Happy Holden term, predic- tive engineering. Partida: at's a great term. at's the evolution here. We can look and find out whether this is a good idea to build it because if it says it works, it can calculate correctly, and it seems to, then we know with assurance that our build is going to work. If it doesn't work, we probably didn't do something right in our process. It's manu- factured circuit boards, you can do something wrong, and it's not reliable. It's that revolution- ary. I think this changes how we build boards in our industry and how we formulate the con- versation with the customer: "Listen, I have a stackup, but I need to talk to you without you just running off to the next supplier who'll say, 'Yes, I can build it.' Listen to the science." ere's an education we can do in the indus- try, this predictive engineering, that it's really demonstrating just that. If we can show that we can make safer and more reliable boards, then it's a benefit to us fabricators that we're can say, "Hey, it's not me. It's your design," aer we've spent all the time building it. We can just start off on the right foot. And it cal- culates other things that are not our problem that we're not going to see. It will identify chal- lenges in the resin flow that leave pathways for CAF failures which are going to happen years OM tester resistance change greater than 5% non-conforming if above red line.