Reduce the pad size to 23, space/trace 5-6-5-6-5




At 03:32 PM 10/20/00 -0700, you wrote:
>I am looking for quick answers.
>
>We want to pass two traces of 6 mil wide traces between two plated holes.
>Hole pad size is 24 mil and holes are on 50 mil grid. 24 mil pad is based on
>12 mil drill size.
>
>This leave the following scenario :
>
>Hole /  4 mil airgap / 6 mil trace / 5 mil air gap / 6 mil trace / 5 mil
>airgap / Hole
>
>Questions:
>(1) Is 4 mil air gap OK for the fab house to work with? or
>(2) Should we reduce the drill size from 12 mil to 10 mils?
>
>Which one is better choice from cost and reliability point of view? We do
>not want to reduce the trace width for impedance needs.
>
>re,
>ken patel
>
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