[SI-LIST] Re: shape of trace and its width
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- Date: Wed, 11 Sep 2013 09:32:09 -0400
Have your fabricator cross-section and measure the trace. The etch profile
is specific to the fabrication process and will change from PCB house to
PCB house.
On Wed, Sep 11, 2013 at 9:25 AM, Balamanikandan K <kbmanick@xxxxxxxxx>wrote:
> Hi
> When traces are manufactured, the etching process can leave them in more of
> a trapezoidal shape than a rectangle.For a ½-oz. trace, this can lead to a
> difference in trace width from top to bottom of about 0.5 mils. This effect
> should be included when modeling the traces, and is easily approximated by
> assigning the mean width of the actual trace to the trace width. For a
> ½-oz. trace, that would mean subtracting 0.25 mils from the target trace
> width.
>
> -Ref:
>
> http://www.incompliancemag.com/index.php?option=com_content&view=article&idv2:making-real-boards&catid&:design&Itemid0
>
> How can we find the mean trace width for the following thickness of copper?
>
> 1. 2 mil
>
> 2. 1.7 mil
>
>
> --
> <
> http://www.incompliancemag.com/index.php?option=com_content&view=article&idv2:making-real-boards&catid&:design&Itemid0>
> Best Regards,
> Balamanikandan.K
>
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--
Scott McMorrow
Teraspeed Consulting Group LLC
16 Stormy Brook Rd
Falmouth, ME 04105
(401) 284-1827 Business
http://www.teraspeed.com
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Teraspeed Consulting Group LLC
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