Why ferrite bead spec doen't include Q factor parameter?

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bittware

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Hello experts,
Why ferrite bead spec doen't include Q factor parameter like the inductor? And for ferrite bead, if the "insertion loss" is higher within the frequency range you want to filter out, the result comes out better?

Thanks in advance!

Best regards,
bittware
 

Beads are intended for attenuation and so are rated for that factor. Toroids are intended for transformers and tuned circuits where Q represents the loss.
 

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