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DP83869HM: Inquiry regarding ETHERNET TRANSFORMERCHOKE replacement compatibility

WOOHYUN NAM
Prodigy 200 points

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869, DP83869EVM

I am currently using the HM5149NL (Pulse) component as the Ethernet Transformer Merchant for the DP83869HMRGZT product, but I plan to switch to the ALT4532V-201-T001 (TDK) component. The TI datasheet recommends an inductance of 350uH, but I am wondering if I can use the 200uH TDK component instead. (This assumes that all specifications except the inductance in the Magnetics Electrical Specification table in the TI datasheet are satisfied.)

 

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If it is not possible to use it, are there any Ethernet physical transceivers available that can handle 200uH?

  • 0
    TI__Genius 14790 points

    Hi Woohyun.

    The 350uH open circuit inductance requirement for the transformer is a part of the IEEE802.3 Ethernet standard. Therefore, only components with this inductance should be used with Standard Ethernet PHYs.

    An alternative implementation is to use a transformerless design, which is detailed here:

     [FAQ] TI Ethernet PHY Capacitive Coupling (Transformerless Operation) 

    Best regards,

    Greg

  • 0
    Prodigy 200 points

    Hello, thank you for your reply.

    I have taken your shared information into consideration.

    As a follow-up inquiry, I would like to change the Transformer to reduce the PCB size. Would it be possible to verify the Ethernet using the attached component (200UH)?

    If necessary, I can also supply samples through TI Korea.

    If you provide your email address, I will share the datasheet with you as well.

    Thank you.

    ...

    ...

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  • 0 in reply to WOOHYUN NAM
    TI__Genius 14790 points

    Hi Woohyun,

    As this component would not follow our datasheet guidelines for the part, it would require requalifying the PHY with the 200uH transformer. This would be a very time consuming process. If you wish to evaluate this transformer with the DP83869, the most efficient next step would be for you to acquire a DP83869EVM and replace the onboard transformer with your desired one. With this board you can then perform the necessary evaluation needed for your system.

    Best regards,

    Greg