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Inductor naming convention

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manishanand14

manishanand14

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Hello Everyone!

What may be the value of ferrite core inductor which has 103 written on it.

Please explain this type of naming convention.
power-inductor-434.jpg
 

Hi,

That sounds like a big inductor. Generally they are named much like resistors. 103 would be 10 uH * 10^3 = 10 mH. The inductors in the picture would be 22 uH (22 uH * 10^0) and 47 uH (47 uH * 10^0). You probably get the idea?
 
My 103 marked inductor is very small in size.

Don't you think 103=10mH is a preety big value.
I need some confirmation.
 

Hi manishanand14 ,
The 103 marked inductor is certainly 10mH. It may be small or big in size depending on the core material. Cores of higher permeability will require fewer turns.
 
in matlab simulation u may also came across this situation where you find inductor naming lyk 10e-3 ,30e3 etc.
 

Coilcraft typically uses the following convention, similar to resistor marking, but the basis units are nH:
xyz - where x = first digit, y = second digit, z = multiplier (units nH)
For example:
220 is 22 x 10^0 = 22 nH
470 is 47 x 10^0 = 47 nH
103 is 10 x 10^3 = 10,000 nH = 10 uH

Some other companies use uH units as their basis for power inductor marking, which would make them:
220 is 22 x 10^0 = 22 uH
470 is 47 x 10^0 = 47 uH
103 is 10 x 10^3 = 10,000 uH = 10 mH

The inductors in your photos look like power inductors, so the uH basis is more likely.

A measurement of inductance would resolve the question quickly (if you can measure them).
 
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