IPC-2221 figure 6-4 "Conductor thickness and width for internal and 
external layers."

Use the magic of pi to figure the equivalent flat trace width, check 
vs the charts and voila!  If it's a solid copper filled uVia then 
look for round wire equivalent.

At 10:32 AM 7/23/2009, Kenneth Wood wrote:
>Hi,
>
>Does the IPC, or anyone, have current capacity numbers for micro vias?
>
>Thanks
>
>Ken
>
>
>
>
>
>
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