[SI-LIST] Re: Why Thumb rule 40 mils takes 1A
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Vijay Anand <vijayanand.ganesan@xxxxxxxxxxxxxxxx>
- Date: Tue, 07 Dec 2010 04:40:52 -0800
It depends on:
Acceptable temperature rise.
Acceptable absolute temperature.
Both of those values feed from your expected product life time. If the
product only has a 90 day warranty and your customers have low
reliability expectations, then your first concern will only be
preventing a fire. The ancient temperature rise versus track width /
weight charts are still published by the IPC. You can probably also
find them online for free.
Steve.
Vijay Anand wrote:
> Dear All,
> I have a Giga POE signals which is routed on 4 width, 5.5 space and 1.8 mil
> thickness. I have loaded up to 1A in that lines. Initially I thought the
> track will damage (since the thumb rules says 40 mils takes 1A) but it
> didn't happen the way I thought. My doubt is what is the actual current
> carrying capacity for 40 mil and 4 mil? Is there is any rule on the track
> width for the PHY signals which has POE.
>
> Please share your experience.
>
> Thanks and Regards,
>
> Vijay
>
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--
Steve Weir
IPBLOX, LLC
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