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Solenoid Terminology - Introduction

Inductor ((coil coil)) technical terminology technical terminology
DC resistance DC resistance
The DC resistance is the resistance generated by DC power.
Large resistors consume higher power, so battery life is reduced.
* For a resonant circuit or an impedance matching circuit, the smaller the resistance value, the better. For a choke coil, the smaller the resistance value, the better.

Self-resonant frequency
The self-resonant frequency is the frequency at which the coil resonates with the inherent capacitance. The coil cannot act as a self-resonant frequency coil.
* For resonant circuits or impedance matching circuits, the self-resonant frequency should be higher than the operating frequency. For choke coils, the self-resonant frequency should be higher than the operating frequency.

Allow current to allow current
Allowable current refers to the maximum DC current that can pass through the coil without damaging the component. If the current exceeds the allowable current, excessive heat may be generated and the quality may deteriorate.
* For choke coils, the allowable current must be greater than the maximum current at which the circuit operates.

Operating temperature range operating temperature range
The operating temperature range refers to the allowable range of temperature around the coil. Does not include naturally generated heat.
* For resonant or impedance matching circuits, it must be within the operating temperature range of the device. For choke coils, it must be within the operating temperature range of the device.

Q value
The Q value is the quality indicator of the inductor. Expressed by the following formula.

DC superposition characteristic DC superposition characteristics
The DC superposition characteristic is an inductance characteristic in which a direct current is superimposed on a micro alternating current.

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