Just to clarify, I have a Class 3 design that I need to use a blind via that has a finished hole size of 6mil (or 4 if I go to laser)
But in IPC-2221B page 99 Table 9-4 for blind vias, Class 3 minimum is 7.87mil
Is there any way to use an 4/6 mil via and still be Class 3?
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