At 10:24 AM 6/19/98 -0700, you wrote:
>Designers Council:
>
>I am designing a board which has heavy current devices, required to handle
>10A max peak.  The board will be constructed using 2 oz. copper.
>
>IPC-D-275 5.3.2.3. states:
>
>"Total cumulative copper web for all layers in any plated through hole
>should not exceed .160" for 1 oz. copper, or .080" for for 2 oz. copper.
>
>The total of the thermal relief cross sectional area divided by the number
>of planes connected to the plated through hole, shall not violate current
>carrying capacity requirements for a given hole.
>
>If the individual web width violates the intended minimum conductor width
>it shall be specified on the master drawing."
>
>If I use the web width calculations, or even the .080" max web width for 2
>oz copper, it's not going to handle the current without getting really hot.
> If I connect the hole directly into the plane, we'll have a difficult time
>soldering it.
>
>What is your recommendations and experience with this type of situation?

Use several vias on each required location for this line.  If this board
has many of these lines, you may be required to use an unusually large
via.......



Frank Frank
Praegitzer Design
3315 Bob Wallace Ave.
Huntsville, AL  35805
(205) 536-6670
(205) 536-5979 (fax)
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