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Thread: Pin pitch for ethernet connection

  1. #1
    Junior Member
    Join Date
    Dec 2021
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    19

    Pin pitch for ethernet connection

    Hello there, first time poster here

    My question is about the 6 pins used for the IDC cable that connects Teensy 4.1 to a magnetic ethernet jack.

    Basically if I connect the Teensy 4.1 to my own baseboard via single row female pin headers (0.1") AND connect the ethernet jack via 2x3 female headers (2mm) - instead of ribbon cable - will there be enough clearance to insert both? It looks quite close.

    Secondly, I will be placing the ethernet jack on my base board as close to the socket for the Teensy as possible. I'm sure it will be a better connection than the IDC ribbon cable. Do I need to be overly concerned about trace widths / interference of my traces? I'm sure the answer is no, but wanted to check if anyone else can comment on this.

    Many thanks!

  2. #2
    Paul sells 3x2 pins and sockets and they work great for custom boards. No clearance issues on my end. I just used this footprint in KiCad https://github.com/XenGi/teensy.pretty
    You can see an example on the store here. https://www.pjrc.com/store/header_socket_3x2.html

    As for the interference, I'm not sure if it is absolutely necessary but I noticed Paul kept pairs the same length (assuming by the squiggles) on his ethernet adapter board so out of caution I also squiggled my traces to make them similar lengths and everything works just fine. It may not be perfect but I just used the "Highlight Net" feature in KiCad to give me the length of the traces. I would recommend making R+ and R- the same/similar length as well as T+ and T-. I'm not sure about trace width but I used 0.25mm.

  3. #3
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    Posts
    26,224
    It is quite close. It definitely does fit if you buy the pins and sockets PJRC sells.

    https://www.pjrc.com/store/header_socket_3x2.html
    https://www.pjrc.com/store/header_24x1.html
    https://www.pjrc.com/store/socket_24x1.html



    If you buy others parts, maybe match up their sizes with the dimensions drawing on the Teensy 4.1 page.

    https://www.pjrc.com/store/teensy41.html#tech

  4. #4
    Junior Member
    Join Date
    Dec 2021
    Posts
    19
    Thanks from drawing my attention to that. The info was so easy to find on the main website that I didn't even look there.

    And thanks for the info Paul. Do you have a UK partner I can buy these from, as shipping from US is quite pricey and need the parts quite soon? No doubt I can find them from a large global online marketplace (!) but just asking here first...

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