On Thu, 30 Sep 2004, Lawrence Lile wrote:

> What is the difference between a choke rated inductor and a normal 
> inductor, (besides, obviously, the words "choke rated" on the 
> datasheet)?

It works with dc through it and it has a low Q factor. This prevents it 
from ringing too much with large but fast spikes. A high quality inductor 
followed by a high quality capacitor used as a filter would cause enough 
ringing at the LC resonant frequency, when subjected to a spike or step 
pulse, to disturb downstream circuits. The low Q is usually obtained by 
winding it in a certain way so it has a large stray capacitance vs. 
ground. There are also hybrid chokes that use other methods to kill 
pulses (transmission line like).

Peter

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