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July 2009

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Subject:
From:
Rex Waygood <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Rex Waygood <[log in to unmask]>
Date:
Fri, 24 Jul 2009 08:45:41 +0100
Content-Type:
text/plain
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Ummm. Not being an expert here but having seen sections of microvias I
would be inclined to put in a large safety factor.
Regards
Rex  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dwight Mattix
Sent: 23 July 2009 19:53
To: [log in to unmask]
Subject: Re: [TN] uVia Capacity

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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