On Thursday, May 30, 2013, Barry Olney wrote:

> Hi Andre,
>
> A typical microstrip configuration for the outer layers of a 4 layer PCB
> (assuming there is liquid photoimageable solder mask) is:
>
> Copper thickness = 1 oz
> Trace width = 4 mils
> Trace clearance = 8 mils
> Dielectric thickness = 3 mils
> Dielectric constant = 4.3
> Zo = 53.9 ohms
> Zdiff = 100.34 ohms
>
> You can download an evaluation copy of the ICD Stackup Planner which has a
> BEM 2D field solver from www.icd.com.au
>
> Cheers,
> Barry
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of AndyK
> Sent: Thursday, 30 May 2013 12:12 PM
> To: [log in to unmask]
> Subject: Re: [DC] Information requested about 10/100Mbps Ethernet 100ohm
> Differential Pair Track Impedance
>
> Hi Andre,
>
> There's more to it than what you have given us. Stackup and material
> is significant.
>
> There are a number of calculators you can use, some free and accurate
> and maybe inaccurate, and paid for ones that are probably very
> accurate.
>
> Try these, and use more than one on your stackup to get an average:
>
> http://www.eeweb.com/toolbox/edge-coupled-stripline-impedance/
>
>  http://www.saturnpcb.com/pcb_toolkit.htm
>
>
> http://www.fedevel.com/welldoneblog/2011/08/pcb-impedance-calculator-single-ended-differential-pair/
>
> http://www.mantaro.com/resources/impedance_calculator.htm
>
> I have checked a few structures using the Mantaro calculator compared
> a high level tool (www.polarinstruments.com) and found the results to
> be within a few percent. For "normal" boards I'd recommend you use
> that.
>
> Cheers..........
>
> Andy Kowalewski
>
> ----- Original Message -----
> From: "(Designers Council Forum)"  "Andre Laverde"
> To:
> Cc:
> Sent:Wed, 29 May 2013 21:00:35 -0500
> Subject:[DC] Information requested about 10/100Mbps Ethernet 100ohm
> Differential Pair Track Impedance
>
>  Hello
>
>  Anyone could recomend me some track with and spacing recomendation
> for a 4
>  layer board with 10M/100Mbps Ethernet diferenctial pair?
>  Thanks
>  --
>  Gracias.
>
>  Cordialmente,
>
>  Andre Laverde, C.I.D.+
>  CIDEI - Centro de Investigación y Desarrollo Tecnológico de la
>  Industria Electro Electrónica e Informática
>  Tel. (571) 2876039 - (571) 3200827
>  Bogotá D.C. - Colombia
>
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