knowledges

Advantages And Disadvantages Of Tantalum Capacitors

2024-01-05 18:00:06

Tantalum electrolytic capacitors are coated with a sintered solid electrolyte columnar resin. The working medium of the tantalum electrolytic capacitors is an extremely thin tantalum penoxide film formed on the surface of the tantalum metal. AVX tantalum capacitor this oxide film dielectric is completely integrated with one end of the capacitor and cannot exist alone. Therefore, the capacitance per unit volume is particularly large. That is, the specific capacity is very high, so it is particularly suitable for miniaturization.


In the work process of tantalum electrolytic capacitor, it has the performance of automatically repairing or isolating the defects in the oxide film, so that the oxide film medium can be strengthened and recover its due insulation ability at any time, without continuous cumulative damage. This unique self-healing performance guarantees its advantages of long life and reliability.


Tantalum electrolytic capacitors have very high working electric field intensity and are larger than any other type of capacitor to ensure their miniaturization.


Tantalum electrolytic capacitors can easily obtain large capacitance, and few competitors in power filtering, ac bypass and other USES.


Unidirectional conductivity, that is, the so-called "polarity", should be applied according to the positive and negative direction of the power supply access current, capacitor anode (positive pole) to the power supply "+" pole, cathode (negative pole) to the power supply "-" pole; If the capacitor is incorrectly connected, the AVX tantalum capacitor will not work, and the leakage current is very large. In a short time, the core will be heated, and the oxidation film will be damaged and then fail.


There is a certain upper limit of the operating voltage, but this disadvantage is not important for a transistor or integrated circuit power supply.


Electrolytic capacitor is generally regarded as an electronic element with excellent performance and long service life. However, it always conforms to the general law of failure of electronic components, that is, the bathtub-shaped failure curve. So it's just a random failure. And this invalidity is the manufacturing process control problem, but also often accompanied by improper or overload products in the use of the process, generally speaking, there are about three modes: current type, voltage type and heating type.


The tantalum electrolytic capacitor has the performance of storing electric quantity, charging and discharging, etc. It is mainly used for filtering, energy storage and conversion, mark bypass, coupling and decoupling, as time constant element, etc. In the application, we should pay attention to its performance characteristics, and proper use will help to give full play to its functions. For example, taking into account the working environment and heating temperature of the product, and taking derating measures, if not used properly, it will affect the working life of the product.


Tantalum electrolytic capacitors are one of the electrolytic capacitors. Widely used in communications, aerospace and military industry, submarine cable and advanced electronic devices, civil electrical appliances, television and other aspects.


Tantalum electrolytic capacitor is made of tantalum metal (Ta) as anode material. According to the structure of anode, it can be divided into foil type and tantalum burning-powder type. In tantalum powder sintered capacitor, due to different working electrolytes, it can be divided into solid electrolyte tantalum capacitor AVX tantalum capacitor and non-solid electrolyte tantalum capacitor. Among them, solid tantalum electrolytic capacitors have large consumption, such as CA type and CA42 type.


There is a CA mark on the shell of tantalum electrolytic capacitors, but the symbol in the circuit is the same as that of other electrolytic capacitors.


Advantages of tantalum capacitor:

Tantalum capacitor, the full name of which is tantalum electrolytic capacitor, is also a kind of electrolytic capacitor. Tantalum capacitor USES tantalum as the medium. Unlike ordinary electrolytic capacitor, which USES electrolyte, tantalum capacitor does not need to be burned with aluminum-coated capacitor paper. In addition, there is no electrolyte inside the tantalum capacitor, so it is suitable for high temperature operation. Tantalum capacitors are characterized by long life, high temperature resistance, high accuracy and excellent performance in filtering high frequency harmonics. In the work process of tantalum electrolytic capacitor, it has the performance of automatically repairing or isolating the defects in the oxide film, so that the oxide film medium can be strengthened and recover its due insulation ability at any time, without continuous cumulative damage. This unique self-healing performance guarantees its advantages of long life and reliability.


Tantalum electrolytic capacitors have very high working electric field intensity and are larger than similar capacitors to ensure their miniaturization.


SMT tantalum capacitors - faults

1. The voltage resistance is not high enough

2. Current is small

3. The price is high is the full name of tantalum electrolytic capacitor, SMD tantalum capacitance also belong to a kind of electrolytic capacitor, due to the use of metal tantalum oxide for medium, do not need to use of normal electrolytic capacitor electrolyte, in addition, tantalum capacitor is not like ordinary electrolytic capacitor using the plating aluminium film capacitor paper burn, so itself almost no inductance, but also limits the capacity of the it. In addition, there is no electrolyte inside the chip tantalum capacitor, which is suitable for high temperature operation.


Although the chip tantalum capacitors are characterized by long service life, high temperature resistance, high accuracy, and excellent high-frequency ripple filtering performance, they have small capacity, higher price than aluminum capacitors, and relatively weak voltage and current resistance. The causes leading to the explosion of the SMD tantalum electrolytic capacitor can be roughly divided into two cases: the explosion caused by the reversed use of positive and negative poles and the excessive ac ripple in the circuit; and the explosion caused by the excessive peak output current of the circuit when the voltage is appropriate. Some customers will easily cause chip tantalum electrolytic capacitor voltage breakdown if they do not understand the voltage withstand, and the light will burn and the heavy will burst. Please refer to the manual before using SMT tantalum capacitors. SMT tantalum capacitors will not explode under normal circumstances. Please rest assured.


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