TCUU10102DP Просмотр технического описания (PDF) - Token Electronics Industry Co., Ltd.
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TCUU10102DP Datasheet PDF : 85 Pages
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TOKEN
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).
Letter
F
G
H
J
K
L
M
Tolerance Letter of Inductance Table
Tolerance
Inductance
±1%
1 henry (H) = 106 μH
±2%
±3%
1 millihenry (mH) = 103 μH
±5%
± 10 %
1 microhenry (μH) = 1 μH
± 15 %
1 nanohenry (nH) = 10-3 μH
± 20 %
Version 2010
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