[SI-LIST] Re: PCB solder current carrying capacity

Vijaya
If you're trying to push thermal limits, you'll want to read this paper.

http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1320488

Doug Brooks wrote:
> In one of the articles on our web site re current carrying capacity 
> of traces, we include this observation (which is approximate).
> The resistivity of solder (depending on its composition) is 
> approximately ten times higher than that for copper. Thus, you can 
> think of the trace (pad) and solder as being two conductors in 
> parallel --- one with 10x the resistance of the other (assuming 
> similar widths and thicknesses.)
>
> On standard traces, we tell our customers to ignore the current 
> carrying capacity of the solder and just consider the copper itself. 
> Then it is determined just by the cross-sectional area of the copper.
>
> Doug Brooks
> UltraCAD
> http://www.ultracad.com
>
>
>
>
> At 11:03 AM 7/21/2009, Gumaste, Vijaylaxmi wrote:
>
>   
>> Hi,
>>
>>
>>
>> I want to determine current carrying capacity of solder pads - 
>> effect of solder material/ land-pad size for very high current 
>> applications (>5A-10A per solder pad)
>>
>>
>>
>> I can use IPC spec to design appropriate metal layer trace 
>> widths/thickness for a required temp rise.
>>
>> However, I am looking at options to estimate/calculate/simulate 
>> current carrying capacity for solder pads.
>>
>>
>>
>>
>>
>> -Vijaya.
>>
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>
> Check out our resources at  http://www.ultracad.com 
>
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