Re: [SI-LIST] : Question about ferrite beads

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From: Ray Anderson (
Date: Mon Nov 13 2000 - 10:20:23 PST

Looking up the Murata BLM11A601SPT part in a Murata catalog
you find the part is specified as such:

        0.5 ohms DC resistance, 600 ohms impedance at 100 MHz
        200 ma max DC current, temp range -55 to +125 C
        Looking at the supplied impedance characteristic plot
        it appears the it reaches a maximum impedance at
        about ~120 MHz (around 700 ohms) and then drops off
        to about 180 ohms at 1 GHz .
        Whoever annotated your schematic as 600 MHz, 0.5 ohms
        appears to have been in error.
Sun Microsystems

> From: "Golian, Alexander" <>
> To: "''" <>
> Subject: [SI-LIST] : Question about ferrite beads
> Date: Mon, 13 Nov 2000 11:02:18 -0500
> MIME-Version: 1.0
> Greetings,
> On an evaluation board I am using, at the bottom of the page, it
calls for
> Ferrite Beads, 600MHz, 0.5ohms. The vendor chose a particular
> The specs for this inductor, BLM11A601SPT, from Murata, does have a
> resistance rating of 0.5 ohms, but it self resonates at ~150MHz.
What would
> the 600MHz mean, that the DC resistance is 0.5 at 600MHz?
> Alex

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