I am looking for measured pad width for 20 mil land pattern for SMT. (QFP or TSOP)
What is Pad width actal versus top copper layer? Copper outer layer is 1 oz or 2 oz or 3 ozs.
Reason for this question: Stencil is 6mils thick with min aperture opening of 9 mils. For gasketing, the pad need to o=be over 10 mils.
2 Ozs copper has etch factor 2.5 mils over etch each side. Can final pad width of over 10 mils be made.
Any inputs on this will be appreciated.
Regards
Ashok
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