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TCUU98V392P Datasheet(PDF) 5 Page - Token Electronics Industry Co., Ltd. |
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TCUU98V392P Datasheet(HTML) 5 Page - Token Electronics Industry Co., Ltd. |
5 / 85 page 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 F ± 1 % 1 henry (H) = 106 μH 1 millihenry (mH) = 103 μH 1 microhenry (μH) = 1 μH 1 nanohenry (nH) = 10-3 μH G ± 2 % H ± 3 % J ± 5 % K ± 10 % L ± 15 % M ± 20 % 03 of 83 Version 2010 http://www.token.com.tw/ rfq token.com.tw TOKEN |
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