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

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From: Bob Lewandowski (Bob.Lewandowski@Vixel.com)
Date: Mon Nov 13 2000 - 10:57:47 PST


Alex,
Is it possible the part number is wrong? Murata part no. BLM11HA601SG has a
self resonance at about 600 MHz, |Z| ~ 700 ohms, at zero DC current. As DC
current increases the low frequency inductance decreases and the resonance moves
up to about 1 GHz. The advantage that this part has is the equivalent parallel
capacitance is very low ( <0.2 pF) making it effective for filtering very high
frequencies.

---Bob Lewandowski
    Vixel Corp.

"Golian, Alexander" wrote:

>
>
> 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 inductor. The
> specs for this inductor, BLM11A601SPT, from Murata, does have a DC 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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