What is a polyester capacitor
Polyester capacitor (
Refers to the use of two pieces of metal foil in electrode, caught in a very thin dielectric, rolled into a cylinder or flat cylindrical core, medium is polyester, polyester film capacitors, high dielectric constant, small size, large capacity, good stability, suitable for the bypass capacitor.
Prominent advantages: the precision of the thin film capacitors, loss, insulation resistance, temperature characteristic, reliability, and to adapt to the environment indicators are better than that of the electrolytic capacitor, two kinds of capacitance of the ceramics.
Prominent disadvantages: price ratio and volume ratio capacity is greater than the above two kinds of capacitance.
What is the difference between polyester capacitor and monolithic capacitor role is capacitive, is to save electricity.
But with different material determines the specific areas of application.
Why capacitor of low cost, capacity can be relatively large, at the same time have a polarity, commonly used.
Ceramics with high frequency performance is better, cheaper, commonly used.
The stability of monolithic stability is good.
Another referred to as film capacitor.
Due to the production craft is the superposition of thin film layers.
Performance strengths and different process in different places may have certain advantages.
The overall performance is good, is one of the best capacity, also is very expensive, better.
Monolithic capacitors is stable, small q coefficient of temperature drift, capacitance value can be 1 uf, long life, the equivalent dc resistance is small, the price is a bit expensive.
Monolithic capacitors is multilayer ceramic capacitor's nickname, English name monolithic ceramic capacitor or mulTI -
Layer ceramic capacitor, referred to as 'MLCC, according to the materials used, can be divided into three categories.
Type of temperature compensation for NPO 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)
So-called polyester capacitor is actually made from two pieces of metal foil electrodes, caught in a very thin dielectric, rolled into a cylinder or flat cylindrical core, medium is polyester.
Polyester film capacitor, high dielectric constant, small size, large capacity, good stability, suitable for the bypass capacitor.
Polyester capacitor is the polymer polyester as dielectric capacitor, is characterized by high voltage, the leakage.
But relatively limited capacity of the capacitor.
From a professional point of view, polyester capacitor is has certain advantages and disadvantages.
And advantage is the precision of the thin film capacitors, loss, insulation resistance, temperature characteristic, reliability, and to adapt to the environment indicators are better than that of the electrolytic capacitor, two kinds of capacitance of the ceramics.
Its temperature characteristic is stable, relatively speaking, is stronger than the above two kinds of capacitance.
But at the same time also have a certain shortcomings, that is, price ratio and volume ratio capacity is greater than the above two kinds of capacitance.
Polyester capacitor are frequently used in all kinds of dc or low frequency pulse circuits using, especially suitable for use as the bypass capacitor.
On many occasions, polyester capacitor is application range is very wide.
When the choose and buy must choose a regular brand of capacitor production, at least can guarantee the quality of the corresponding, avoid because of poor quality affect the performance of the capacitor.
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