DJ Delorie wrote:
What's a good size ferrite to use on an rs232 line? I've got a spot
for a set of 0603 ferrites on my serial console lines, but I have no
idea what size (uH) ferrite to use.
The ferrite bead impedances are usually specified by a graph showing
both the resistive and reactive impedance vs. frequency. Choose your
curve based on what frequencies you want to filter.
One part we use a lot is a Murata BLM18AG102SN1. They are available
from DigiKey. This part has a fairly high resistive component, chosen
specifically for our use mainly as a power supply filter. It would also
be appropriate for slower data signals like RS-232. If you were
concerned about too much filtering at higher frequencies, they have
other parts in this family with less of a resistive component.
Joe T
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