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Bigger ferrite beads are better? (more attenuative)

Discussion in 'PCB Layout, Design and Manufacture' started by eem2am, Jul 21, 2021 at 1:36 PM.

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  1. eem2am

    eem2am

    422
    0
    Aug 3, 2009
    Hi
    Both of these ferrite beads are 120R at 100MHz...

    0402 ferrite bead:
    https://uk.farnell.com/murata/blm15px121sn1d/ferrite-bead-0-06ohm-2a-0402/dp/2470351RL

    0603 ferrite bead:
    https://uk.farnell.com/murata/blm18...025ohm-3a-0603/dp/1515752RL?st=blm18sg121tn1d

    Would you agree that the 0603 size bead is better?, ......because having a longer distance between its terminals, it means less radiated emissions will be able to "jump over it" (couple round it, instead of going through it and getting attenuated)
     
  2. bertus

    bertus Moderator

    1,864
    708
    Nov 8, 2019
    Hello,

    Compare the DC rating and the DC resistance.
    What do you need?

    Bertus
     
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