monolithic capacitors are multilayer ceramic capacitor's nickname, referred to as 'MLCC, widely used in electronic precision instruments.
All sorts of small electronic equipment for resonance, coupling, filtering, by-pass.
Monolithic capacitor is the basic structure of the simple structure of the parallel plate capacitor by the middle of an insulating dielectric layer and two conductive metal electrodes, basic structure is as follows: as a result, the structure of the multilayer chip ceramic capacitors mainly includes three parts: ceramic dielectric, inside the metal electrodes, outside the metal electrode.
And multilayer chip ceramic capacitors, it is a multi-layer composite structure, simply say that it is composed of multiple simple and couplet body of parallel plate capacitor.
Classification type of temperature compensation for NPO monolithic capacitor dielectric this capacitor electric performance is the most stable, basically does not change with temperature, voltage, time, is a super stable capacitance material type, low loss and applicable in higher requirements for stability, reliability, high frequency, uhf and VHF circuits.
Second high dielectric constant for X7R dielectric because of X7R is a kind of strong dielectric, and thus can produce capacity greater than NPO dielectric capacitor.
The condenser performance is stable, with the change of temperature, voltage, time, its specific performance is not significantly change, belongs to the stable capacitance material type, use straight, coupling, alongside the road, to the filter circuit and high reliability requirements of high frequency circuits.
Three classes for the semiconductor Y5V has high dielectric constant, dielectric this capacitor is often used in the production of large volume, high nominal capacity of the large capacity capacitor products.
But its stability is worse than X7R capacity, capacity, loss are more sensitive to the test conditions, such as temperature, voltage, mainly used in electronic oscillation of the whole machine, coupling, filtering and bypass circuit.
Monolithic capacitors is larger than general porcelain capacitor (
10 pf ~ 10μ
And large capacity, small volume, high reliability, stable capacitance, high temperature resistance, good insulation, and low cost, thus widely used.
Monolithic capacitors, not only can be used as substitute of mica capacitor paper condenser, also replaced some tantalum capacitor, widely used in the small and tiny electronic equipment (
Such as LCD watches and miniature instruments)
Monolithic capacitor effect 1, exchange of energy storage which is the most basic function, monolithic capacitors mainly through its charging and discharging process to produce and cast a electricity.
This is mainly based on the large capacity of Ⅱ class monolithic capacitor is given priority to, in some cases can even replace the small aluminum electrolytic capacitor and tantalum electrolytic capacitor.
2, every direct pay (
The bypass and coupling)
Due to the monolithic capacitors is not a guide with perfect, it is through the communication to regularly and reflects on both ends of the electric phenomenon, therefore, it can with other components in the circuit in parallel, through communication, and dc are blocked off, have the effect of the bypass.
In ac circuits, monolithic capacitors with polarity of the input signal to carry on the charge and discharge, thus make the connection at the ends of the monolithic capacitor circuit conduction state, have the effect of coupling.
In general, and amplifier, or op-amp input end connected monolithic capacitors for coupling monolithic capacitor;
And amplifier, or op-amp emitter connected monolithic capacitors for bypass monolithic capacitors.
Both with Ⅱ kind of monolithic capacitor is given priority to, especially in the 0.
1 uf capacitance in the majority.
3, frequency filtering in ac circuits, for more than a mixed signal frequency, we can use the monolithic capacitor separate part of it, in general, we can use a reasonable capacitance monolithic capacitors will filter out most of the low frequency signal.
This major is given priority to with high frequency or uhf monolithic capacitors.
4, inhibition of surge voltage due to the monolithic capacitors is an energy storage element, therefore, in the circuit, it can remove those brief surge pulse signal, can also absorb circuit of voltage fluctuations in the excess energy.
Filtering are mainly composed of high frequency products.
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