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Fixed Inductor Terminology Glossary

Inductor and Magnetic Product Terminology & Glossary

DCR (DC Resistance)

The resistance of the inductor winding measured with no alternating current. The DCR is most often mini-

mized in the design of an inductor. The unit of measure is ohms, and it is usually specified as a maximum

rating.

EMI

EMI is an acronym for Electromagnetic Interference. It is unwanted electrical energy in any form. EMI is

often used interchangeably with “Noise”.

Ferrite Core

Ferrite is a magnetic material which consists of a mixed oxide of iron and other elements that are made to

have a crystalline molecular structure. The general composition of ferrites is xxFe2O4 where xx represents

one or several metals. The most popular metal combinations are manganese and zinc (MnZn) and nickel

and zinc (NiZn). These metals can be easily magnetized.

Impedance

The impedance of an inductor is the total resistance to the flow of current, including the AC and DC

component. The DC component of the impedance is simply the DC resistance of the winding. The AC

component of the impedance includes the inductor reactance. The following formula calculates the

inductive reactance of an ideal inductor (i.e., one with no losses) to a sinusoidal AC signal.

Equation Z = XL = 2ΠƒL.

This equation indicates that higher impedance levels are achieved by higher inductance values or at higher

frequencies.

Inductance & Tolerance

The property of a circuit element which tends to oppose any change in the current flowing through it. The

inductance for a given inductor is influenced by the core material, core shape and size, the turns count and

the shape of the coil. Inductors most often have their inductances expressed in microhenries (μH).

Tolerance Letter of Inductance Table

Letter

Tolerance

Inductance

± 1 %

1 henry (H) = 106 μH

1 millihenry (mH) = 103 μH

1 microhenry (μH) = 1 μH

1 nanohenry (nH) = 10-3 μH

± 2 %

± 3 %

± 5 %

± 10 %

± 15 %

± 20 %

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Version 2010

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