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Good morning,

I have a design using these magnetics over here to filter and isolate the ethernet signal: https://www.mouser.com/ds/2/336/-515468.pdf

And I have this other component as an alternative: http://www.bourns.com/docs/Product-Datasheets/sm13072apel.pdf

My question is if they are fully compatible. The only difference I find is the marking on the polarity of the transformers (in the isolation transformer). Package and pinout are compatible

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    \$\begingroup\$ Nothing is fully compatible at the extremes. Without knowledge of what your circuit is and your performance expectations, comparing data sheets is a waste of time. \$\endgroup\$ – Andy aka Mar 9 '18 at 10:02
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    \$\begingroup\$ The only difference I find is the marking on the polarity of the transformers (in the isolation transformer). Well you're not reading very carefully then, are you! The inductance is different, the measurement ranges are different. But not very different. As they're both sold for ethernet use I would guess they are both suitable for ethernet use. Certainly for 10T, possibly for 100T, unlikely for 1000T \$\endgroup\$ – Neil_UK Mar 9 '18 at 10:16
  • \$\begingroup\$ Sorry, probably I didn't use the right words. I agree nothing is fully compatible and that there are differences in the parameters (I read them :P). I am talking about the higher level (schematic diagram) with the dot marking. I would like to know if that difference could make a difference. Just to make it simpler. Consider the first magnetics I am using (not the alternative) and change the marking on the schematics as in the alternative. Would that make a difference in the design if you consider the rest of the system as a black box? \$\endgroup\$ – borias23 Mar 9 '18 at 10:25
  • \$\begingroup\$ Btw it is used for 100T ethernet \$\endgroup\$ – borias23 Mar 9 '18 at 10:28
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These both are compatible with IEEE 802.3. Also, excluding minor differences in the recommended footprints, these both are interchangeable with each other.

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