FreeLists / si-list / [SI-LIST] Re: current in a 12 mil via.

[Ray Anderson <Raymond.Anderson@xxxxxxx>]

Someone locally asked a similar question of me just yesterday. In response
I found a spreadsheet based via current capability calculator on the web
at the following URL:

www.pcbstandards.com/downloads/Metric%20Environment/ 
Calculators/Via%20Current/Via%20Current.xls

In playing around with it I found that it gives intuitively 
correct answers haven't done a real sanity check on the answers 
so can't vouch for it one way or another.

A 12 mil via connecting to 1 oz copper trace gives the following
results in the spreadsheet:

        Allowable temp rise             Current
        -----------------------------   ----------
        10 degree C rise above ambient  .984 amps
        20 degree C rise above ambient  1.334 amps
        30 degree C rise above ambient  1.595 amps
        40 degree C rise above ambient  1.810 amps
        
If anyone sees a problem with the spreadsheet's calculations I'd like to
hear about them. The author of the sheet admits he hasn't done rigourous
verification.....


-Ray    
        
>
>Hi everyone,
> 
>Where can I find information about current-carrying capacity of a via at
>different temperatures?
> 
>Thanks,
>Mike N.
>

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