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USB-B jack with common mode choke?

Discussion in 'Electronic Design' started by Joerg, Jan 26, 2012.

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  1. Joerg

    Joerg Guest


    Does anyone remember a manufacturer that makes through-hole USB-B jacks
    with common mode chokes in there? Preferably with a metal flap that can
    also be grounded against a front panel.

    Came upon a situation where they didn't place CM chokes on the board,
    trying to see if it can be remedied sans relayout.
  2. Oppie

    Oppie Guest

    I had just been using a ferrite bead and passing the USB D- and D+ lines
    both through it.
  3. Joerg

    Joerg Guest

    Looks very tight in our case but that's an idea. Maybe we can find a
    really flat bead.
  4. Hi Joerg,

    You can also use the same solution that the trick used in plenty of, well,
    east-designed products : ship it with a USB cable with a built-in ferrite
    bead on the device side. That way the "product" is the cable+device kit, and
    your EMC certification will pass without problem. Of course your customer
    may have issue if he use another USB cable, but that's no longer your
    problem ;+)

    Friendly yours,
    Robert Lacoste
  5. Joerg

    Joerg Guest

    A big ferrite over the whole cable isn't helping, just a tiny ferrite
    over only D+ and D- (together, or course) is what helps. Haven't found
    any cable that has those. If anyone knows a source I am all ears.
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