What does "FB23 220R" mean next to an inductor?

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hobbskw

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Hello,
I am reading a schematic and noticed an inductor symbol that said "FB23 220R" next to it.
What does this mean? I cannot find any inductor that has part# FB23, and I thought 220R would be for resistance, not inductance.
 

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Hi,

maybe you should show us the picture/schematic you have seen.

Klaus
 
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FB23 is probably the reference designator. 220 micro Henry, maybe.

Actually it's probably a ferrite bead with 220 ohm impedance , or maybe 22 ohm.
 

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hobbskw said:
I am reading a schematic and noticed an inductor symbol that said "FB23 220R" next to it.
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Most SMD ferrite beads are specified by their resistance. If you are reading a schematic, look for FB22 or FB21 etc. If you can locate them, it may just be a component identifier (23 being a serial number). These SMD components do not have inductance values explicitly specified. They suppress high frequency noise reasonably well.
 

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220R at 100Mhz.
This is ferrtie bead. Like inductor but core lost + wire lost follow frequency of current through it.
It use for filter noise in a specific of frequency range.
Does not effect with small dc current.
Higher xxxR value will make dc resistance increase ,then dc acceptable current is smaller.
"high frequency" - that is only half story.
If frequency higher max frequency, its impedance reduce.
Select correct ferrite bead only apply for a frequency range.
Insert ferrite bead can reduce high frequency is true. In other side it also increase amplitude of basic(low) frequency. Need a damper RC or R // RB to reduce this ringing to build the best filter.
 

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