Les, what distance between holes?  I am using .010" distance, edge to edge, to
calculate how many holes I can place in the rectangular copper area, and from
there total copper area small vias vs larger holes.  We are doing the
calculations for 0.008" vias and 0.035" holes.

Thanks for your help - Jana

Jana Carraway
Maxtek -- the Maxim/Tektronix Multichip Module facility
tel 503.627.2063, fax 503.627.4651
email [log in to unmask],  www.maxtek.com


"Leslie O. Connally" <[log in to unmask]> Wrote:
|
| Jim,
|  I agree with one exception, If we are talking about the
| same number of holes,
| the larger holes will yield the greater cross sectional
| area. If more small
| holes are placed on a smaller grid, then the greater area
| can be accomodated.
|
| Cheers,
| Les Connally
|
| >  From: Jim Marsico 516-595-5879 <[log in to unmask]>,
| on 3/25/98 10:13 AM:
| >  Whichever yields the most cross sectional area of
| copper will give you the
| >  best
| >  thermal performance, therefore, more small holes would
| be the best scenario.
| >  We, in fact require vias to be plated with .002" of
| copper for thermal
| >  reasons.
| >
| >
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