![]() Taking an approach of designing to meet Class 3 where possible, and accepting Class 2 for a small subset of features, with confirmatory testing to validate reliability, can be a way to cost-effectively meet reliability requirements. inner layer spacing under high-density area array components. Going one step further, we could potentially exempt only certain areas and/or features of a PWB design from Class 3 requirements, e.g. ![]() If we can make the case that a PWB designed and inspected to IPC-A-600 Class 2 will meet the reliability requirements of the application, and our customer accepts this, then there is no reason that we can't take this approach. PCB can be based on IPC-A-600 class 2, but the entire Assembly can still be made based on IPC-A-610 Class 3. My understanding is that they are 2 different standards. If the PCB Assembly inspection requirement is IPC-A-610 Class 3, does it mean that the PCB inspection IPC-A-600 also has to be IPC Class 3?
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