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Why Ferrite Bead in Supply line

  1. May 20, 2010 #1
    Presently Am try to design a USB to UART,485& 232 board, in that Am using FTDI USB to UART converter, In the FTDI data sheet they providing some sample design and A ferrite bead is connected in series with the USB power supply to reduce EMI noise from the FT232R and
    associated circuitry being radiated down the USB cable to the USB host. The value of the Ferrite Bead depends on the total current drawn by the application. A suitable range of Ferrite Beads is available from Steward (www.steward.com[/URL]), for example Steward Part # MI0805K400R-10,, So guys could you please tell me How we choose the right part number, my apllication will draw maximum of 30mAs
    Last edited by a moderator: Apr 25, 2017
  2. jcsd
  3. May 21, 2010 #2


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    Staff: Mentor

    Last edited by a moderator: May 4, 2017
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