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DC Flter Inductor, measured with Ohms on schematic

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hitech95:
HI,
I was reading into some reference schematic of the chips used inside my chromebook.
So far i've seen a "strange" thing.

I've studied that inductors are measured in Henry, but in this case they used Ohms.

The indictor is marked as 100Ohm@100Mhz, what does this means?


this one is another example:


Have a nice day,
Hitech95

mikerj:
That component is a ferrite bead, not an inductor.

MagicSmoker:
More specifically, that is a ferrite bead "noise filter" with a combined resistance and inductive reactance (that is, impedance) of 100R at 100MHz.

DannyTheGhost:
It's a ferrite bead. For DC current it has almost no resistance, but it's main purpose is impedance. You should read it as "Impedance is 100 Ohms AT 100MHz", which means that it's working like 100Ohm resistor for high frequency currents

hitech95:
Thanks for the replays. I was expecting that also ferrite beads had the Henry as measure unit. (The fact that it's a first order filter I was expecting it was treated as an inductor.

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