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TM4C1294KCPDT: Ethernet PHY 802.3 magnetics

Genatco
Guru 55913 points
Part Number: TM4C1294KCPDT

Hello forum,

Has anyone past tested the Wuerth 7499010121A RJ45 with built in transformer? It seems it would be a viable solution to reduce the inductance of the differential pairs and consolidate PCB layout. The datasheet and links to the part specifications pages are provided for review. Thank you for reviewing the prudent information.

Fig 20-13: The Ethernet PHY is designed to work with transformers that meet the IEEE 802.3 standard. To utilize the Auto-MDIX (AMDIX) capability of the Ethernet PHY, a symmetrical transformer is
recommended. The Pulse HX1188 transformer has been tested and is known to successfully interface to the Ethernet PHY.

ETHXFMR Wuerth RJ45TH LED 7499010121A.pdf

https://www.digikey.com/en/product-highlight/w/wurth-electronics/we-lan-transformers-and-we-rj45-lan-jacks

  • +1
    TI__Guru**** 191886 points

    Hi BP101,

      Welcome back! 

    Genatco said:

    Has anyone past tested the Wuerth 7499010121A RJ45 with built in transformer? It seems it would be a viable solution to reduce the inductance of the differential pairs and consolidate PCB layout. The datasheet and links to the part specifications pages are provided for review. Thank you for reviewing the prudent information.

    There are TI reference designs that use RJ45 with built-in transformer for TM4C129. Therefore, I don't see a problem to to use built-in transformer RJ45. I have no experience with Wuerth 7499010121A RJ45 and can't comment on it other  than to say if it is compliant to IEEE 802.3 standard then it should be fine. I will let the community comment their experience with this particular RJ45.  

  • 0 in reply to Charles Tsai
    Guru 55913 points

    Charles thank you for fast answer and Happy New Year may it bring you renewed prosperity.