TCUU98V471DP Datasheet, PDF (4/85 Pages) Token Electronics Industry Co., Ltd. – TCUU EMI Line Filters

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Fixed Inductor Terminology Glossary
Fixed Inductor
Terminology Glossary
Inductor and Magnetic Product Terminology & Glossary
Air Core Inductor (Ceramic Core Inductor)
Air core inductors are often referred to as “Ceramic Core” inductors. Air core inductor is most often
used in high frequency applications where low inductance values, very low core losses and high Q
values are required.
Ceramic has no magnetic properties. Thus, there is no increase in permeability due to the core
material. Its main purpose is to provide a form for the coil. In some designs it also provides the
structure to hold the terminals in place. Ceramic has a very low thermal coefficient of expansion.
This allows for relatively high inductance stability over the operating temperature ranges.
Axial Inductor
An inductor constructed on a core with concentric leads on opposite ends of the core. Axial
inductors are available for both power applications and RF applications, and are available in many
core materials including the basic phenolic, ferrite and powdered iron types. Both rod and bobbin
shapes are utilized. Axial inductors are very suitable for tape and reel packaging for auto placement.
RF Choke
Another name for a radio frequency inductor which is intended to filter or choke out signals.
What is Inductor?
A passive component designed to resist changes in current. Inductors are often referred to as “AC
Resistors”. The ability to resist changes in current and the ability to store energy in its magnetic
field,account for the bulk of the useful properties of inductors. Current passing through an inductor
will produce a magnetic field. A changing magnetic field induces a voltage which opposes the
field-producing current. This property of impeding changes of current is known as inductance.
The voltage induced across an inductor by a change of current is defined as:
Equation V = L d_i/d_t where V (Induced Voltage); L (Inductance Value).
Thus, the induced voltage is proportional to the inductance value and the rate of current change.
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