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Reply To: | (Designers Council Forum) |
Date: | Thu, 22 Feb 2007 16:32:22 +0530 |
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I got a mail from my FAB house to increase the NPTH - copper/t
Hi All,
I got a mail from my FAB house to increase the NPTH - copper/trace clearance from 0.010 inch to 0.015 inch for a NPTH hole with drill size 0.150".When my drill hole is 0.150 inch with offset tolerance of +/- 0.003, i still have 0.004 inch safer value when i use 0.010 inch clearance value. When I questioned the FAB house i got feedback that its their DFM rule for maximizing the production yield.
I am not satisfied with the answer, Can anyone help me understand why NPTH to copper/trace clearance should be much higher?
thanks,
Raj.
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