Sefika,
A conservative method is to use the via-barrel circumfrence as the trace
width and use half the plating thicknes for the height. From here you can
determine the cross sectional area and apply that to the IPC charts.
This is a method that I have used for several for power distribution.
Hope this helps.
Buck....
Quoting Şefika ÖZKAL <[log in to unmask]>:
> Dear TechNetters,
>
> In IPC-2221, figure 6.4 gives three charts to estimate the current capacity
> of the traces for different temperatures and different oz values. But, how
> can we calculate the via resistance or via current capacity?
>
> Best Regards
>
> Sefika OZKAL
> Design Engineer
> ASELSAN INC. MGEO Division
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
> Sent: Tuesday, July 26, 2005 3:48 PM
> To: [log in to unmask]
> Subject: Re: [TN] Lead free in automotive
>
> Any one can provide data for high temperature fatigue of (100-120C) of
> standard leadfree alloy compare to the Pb/Sn eutectic? Any grain size study
> and crystallography study would really appreciated. Thanks.
> Best regards,
> jk
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Leland Woodall
> Sent: Monday, July 25, 2005 8:37 PM
> To: [log in to unmask]
> Subject: Re: [TN] Lead free in automotive
>
>
> Exempt for American automotive, perhaps. I'm not really sure.
>
> Exempt for Japanese manufacturing? No. Right now, 75% of our products
> utilize lead-free processing. The remainder are on schedule to change
> within the next 18 months.
>
> If you're not affected now, you soon will be.
>
> Leland Woodall
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Werner Engelmaier
> Sent: Monday, July 25, 2005 4:43 PM
> To: [log in to unmask]
> Subject: Re: [TN] Lead free in automotive
>
>
> In a message dated 7/25/05 16:32:01, [log in to unmask] writes:
> > Automotive is exempt.
> >
>
> Dream on-- there is no practical way to be "exempt."
>
> Werner
>
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