If you know the  plating thickness in the through hole, calculate the cross
sectional area of the plating using
  Pi*r1^2 - Pi*r2^2 where Pi = 22/7 or 3.1428, r1 is the drill hole radius
and r2 is the finished hole radius. Then just look up what the current
carrying capacity of copper is in Amps per unit of cross-sectional area in
cm^2 and multiply the two figures together.

Peter Duncan




                    Geoff Layhe
                    <glayhe@LAMAR        To:     [log in to unmask]
                    -UK.CO.UK>           cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST
                    Sent by:             Aero/ST Group)
                    TechNet              Subject:     [TN] current carrying capacity of PTH
                    <[log in to unmask]
                    ORG>


                    10/10/01
                    09:40 PM
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Hi All,
Does anyone have information such as formula, graphs etc  regarding current
carrying capacity of plated through holes?

TIA
Geoff Layhe
www.lamar-uk.co.uk


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