inductors - bead vs thru hole

parts-man73

Here's a part that I've never used in a project before. An inductor.

What is the different between a surface mount ferrite bead and a thru-hole type. I try to use thru-hole as much as possible, but that it getting harder and harder to do.

An example of what I mean by a thru-hole inductor can be seen here specfinder.delevan.com/pdf/1537.pdf

are they interchangable assuming the same value (measured in uH) ? or do they each have their own uses and applications?

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Brian

uController.com - home of SpinStudio

Beau Schwabe

parts-man73,
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In most cases all you need to be concerned with is the "measured uH" value.· Where different types of inductors come into play can translate to the 'Q' or Quality factor of the inductor.· Air-core inductors are going to be the best as far as the Q factor... other inductors that have more metal in the core region can physically be much smaller than their Air-Core counter part, but they also tend to·have a lower Q factor.· A lower Q factor basically translates to a wider bandwidth and lower dB discrimination (...ok for most filtering applications) , where a higher Q factor translates to a narrower bandwidth and higher dB discrimination (...a must for RF applications)
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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Post Edited (Beau Schwabe (Parallax)) : 9/21/2007 3:46:33 PM GMT

parts-man73

Beau,

Thank you for that insight, I may have to print it out for future reference as well.

It always seems that component selection is the most time consuming part of good circuit board design.

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Brian

uController.com - home of SpinStudio