Rule of thumb - 1 amp per via. You will need three vias. 


Cliff

Cliff Lamson
PCB Design Manager
Project Manager
PLEXUS Technology Group
5511 Capital Center Drive, Suite 600
Raleigh, NC 27606
Main 919-807-8000
Direct 919-807-8047
Mobile 919-649-3159
Fax 919-807-8190
The Product Realization Company
www.plexus.com


-----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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