Try the calculator from Saturn PCB.
<http://www.saturnpcb.com/Software.htm> It is fairly accurate and with a
minimum of de-rating you should be able to find a via setting that will
work for your application.  


Jeffrey McGlaughlin, CID 
Engineering Designer 
Battelle 
505 King Avenue 
Columbus Ohio 43201-2693 
(614)424-7582 Phone 
(614)458-7582 Fax 


-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
Salvaggi, Colleen
Sent: Wednesday, September 26, 2007 10:41 AM
To: [log in to unmask]
Subject: [DC] Carrying current through a via

How would one calculate how big a via hole has to be in order to carry
enough current through it to meet the load requirements?

 

I have a 4 layer, 2 oz, .062 thick, board that needs to carry 3 amps
through a via, (via barrel platting of .001). I can not find any
information that will help calculate how big the hole needs to be to
accommodate this.

 

Any assistance would be greatly appreciated.

 

Thanks,

 

Colleen


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