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

[Bill Dempsey <BDempsey@xxxxxxxxxxxx>]

This month's Printed Circuit Design & Manufacture has the first in a series
of tests showing the current carrying capability of traces and vias and how
far off IPC is from actual.  Check their site http://www.pcdandm.com for
more info or to request this month's issue. The via data is announced to be
in future articles.

Bill

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ray Anderson
Sent: Wednesday, May 14, 2003 3:03 PM
To: Mike_Nguyen@xxxxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: current in a 12 mil via.



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.
>

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
  


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu