----- Original Message ----- 
From: "Şefika ÖZKAL" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, July 26, 2005 6:09 AM
Subject: [TN] Via Resistance / Current Capacity


> Dear TechNetters,
>
> In IPC-2221, figure 6.4 gives three charts to estimate the current
capacity
> of the traces for different temperatures and different oz values. But, how
> can we calculate the via resistance or via current capacity?
>
> Best Regards
>
> Sefika OZKAL
> Design Engineer
> ASELSAN INC. MGEO Division
>

Sefika,
If you haven't got a copy from someone else yet, I have a PDF of an article
written by Doug Brooks and Dave Graves of UltraCad Design that looks into
calculating via current capacity.  E-mail me and I'll send it.
Richard

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