Service Life of an Aluminum Electrolytic Capacitor

January 11, 2011 Views
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The service life of an aluminum electrolytic capacitor for mid- to high-voltage filters is affected by the applied voltage. If the applied voltage is between 60% and 100% of the rated voltage, the estimated service can be extended by lowering the applied voltage below the rated voltage. However, if the applied voltage is less than 60% of the rated voltage or the capacitor is used in low-pressure (100 WV or less) applications, the impact of the applied voltage on the service life is negligible.

Therefore, service life is estimated assuming no impact from voltage. Continuous application of a voltage over the rated voltage rapidly increases leakage current in a capacitor. This may increase internal pressure due to generation of gases, resulting in activation of the safety vent in a short time and/or formation of an internal short circuit. For this reason, the applied voltage must be maintained below the rated voltage during use.

Besides, it should be noted that the circuit design is such that the applied voltage will remain 80% or less of the rated voltage during use.

Where more than one capacitor connected in series is used, the applied voltages across the individual capacitors may become out of balance, resulting in the application of excessive voltage to them. To avoid this, either choose a rated voltage allowing for voltage imbalances, or connect a voltage divider(resistors) to the capacitors. Please be careful about charge/discharge.

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Potentiometer can be used as Rheostat

January 10, 2011 Views
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Any three-terminal potentiometer can be used as a two-terminal variable resistor by not connecting to the third terminal. It is common practice to connect the wiper terminal to the unused end of the resistance track to reduce the amount of resistance variation caused by dirt on the track.

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Gold Capacitors, Electric Double Layer Capacitors---TS12

January 8, 2011 Views
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1.Small-size, large capacity, excellent voltage holding.
2.Unlike battery, unlimited charge/discharge cycle.
3.Wider temperature range.
4.Ideal for backing up of CMO's.microcomputers, RAM's and also used in VCR's tuners, TV sets, telephone sets and other.
5.Serial structure, two cell with same characteristics.
6.Low ESR, high energy density.
7.The capacity range is from 0.1F-3000F, and the operating voltage of capacitors range from 2.5V-5.5V.

Electric Double Layer Capacitor is supplied by Suntan Technology Company Limited, in website there is a full products list of Gold Capacitors and other electrical products.

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Mica Capacitors –TS23

January 7, 2011 Views
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There are many types of mica, but only six or so are common rock-forming minerals. Mica capacitors are normally made from muscovite mica, or potassium aluminum silicate, KAl2Si3O10(OH)2. It is thermally stable up to 500°C, and has a high dielectric strength. Phlogopite mica, or potassium magnesium silicate, KMg3Si3AlO10(OH)2, is softer than muscovite mica and has less desirable electrical characteristics, but it may be used up to 900°C. Mica deposits are found in Madagascar, Central Africa, South America, and India. India is probably the biggest supplier of mica.
Natural mica contains many other materials including, iron, sodium, ferric oxide, and lithium. Because of the variability in composition of natural mica, mica destined for use in capacitors must be carefully inspected and classified, which adds to the manufacturing cost. All varieties of mica are chemically very stable and inert. Mica does not react with oil, water, most acids, (the exceptions are hydro-fluoric and sulfuric acid) alkalis, and solvents.
Mica Capacitors in Suntan suppliers is means High Reliability and Stability, Compact and High Moisture – Resistance.

In there has a Mica Capacitors Specifications, and there has detailed PDF for Mica Capacitors. The following picture is Suntan Mica Capacitor’s shape for your kindly reference. If you are interested in these products, welcome to Suntan’s website for a view.

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Chip Tantalum Capacitor – SMD--TS20

January 6, 2011 Views
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Tantalum SMD capacitors are widely used to provide levels of capacitance that are higher than those that can be achieved when using ceramic capacitors. The capacitor technology that is used within SMD tantalum capacitors is based on the solid tantalum capacitor technology. This is robust and enables very small capacitors to be made.

For many years tantalum capacitors were used in SMD applications because electrolytic capacitors were not able to survive the high temperatures of the soldering process. Now that electrolytic capacitor technology has been developed to withstand the soldering process, these capacitors are now also widely used. Despite this, the other advantages of tantalum capacitors are employed in many circuits, and they are still used in vast quantities.

Suntan’s Chip Tantalum Capacitor - SMD is solid electrolyte, high Volumetric efficiency, stable electric performances.

The following is Features:

  • Molded case available in six case codes
  • Compatible with all popular 'High Volume' automatic pick and equipment   
  • Optical character recognition qualified

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SMD Varistor Specifications

January 5, 2011 Views
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A varistor is an electronic component with a significant non-ohmic current-voltage characteristic. The name is a portmanteau of variable resistor

SMD resistors are manufactured by a number of different companies. Accordingly the specifications vary from one manufacturer to the next. It is therefore necessary to look at the manufacturers rating for a specific SMD resistor before deciding upon exactly what is required. However it is possible to make some generalisations about the ratings that might be anticipated.

Power rating: The power rating needs careful consideration in any design. For designs using SMD’s the levels of power that can be dissipated are smaller than those for circuits using wire ended components. As a guide typical power ratings for some of the more popular SMD resistor sizes are given below. These can only be taken as a guide because they may vary.

  • 1206: 1/8 watt
  • 0805: 1/10 watt
  • 0603: 1/16 watt

Some manufacturers will quote higher power levels than these. The figures given are conservative.

Tolerance: In view of the fact that SMD resistors are manufactured using metal oxide film they available in relative close tolerance values. Normally 5%, 2%, and 1% are widely available. For specialist applications 0.5% and 0.1% values may be obtained.

Temperature coefficient: Again the use of metal oxide film enables these SMD resistors to provide a good temperature coefficient. Values of 25, 50 and 100 ppm / C are available.

Suntan has supply SMD Varistor which called TSVC, TSVC is widely used in Notebook, PDA, Cellular Phone, MP3,Main board, LCM, HUB, Microphone, Wireless LAN, VOIP, Auto electronic and so on. At Suntan website: ,they have introduced the details about SMD Varistor TSVC by PDF:


Multilayer Ceramic Capacitor - SMD - TS18

January 5, 2011 Views
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The ceramic SMD capacitors form the majority of SMD capacitors that are used and manufactured. They are normally contained in the same type of packages used for resistors.

  • 1812 - 4.6 mm ~ 3.0 mm (0.18" ~ 0.12")
  • 1206 - 3.0 mm ~ 1.5 mm (0.12" ~ 0.06")
  • 0805 - 2.0 mm ~ 1.3 mm (0.08"~ 0.05")
  • 0603 - 1.5 mm ~ 0.8 mm (0.06"~ 0.03")
  • 0402 - 1.0 mm ~ 0.5 mm (0.04"~ 0.02")
  • 0201 - 0.6 mm ~ 0.3 mm (0.02"~ 0.01")

Suntan Multilayer Ceramic Capacitor - SMD - TS18 has four types of packages used for resistors. In Suntan’s website there is a Dimensions of Multilayer Ceramic Capacitor - SMD - TS18 as followings:

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Multilayer Ceramic Capacitors constructed

January 5, 2011 Views
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MLCC capacitors are marvels of modern material science. Manufacturing MLCC capacitors is considerably more complicated than manufacturing dipped ceramic capacitors. First, the base ceramic material is mixed with a binder and fashioned into thin sheets. Electrodes are painted onto one side of the sheets using a paint that consists of a liquid binder with fine metal particles in suspension. The metals that are used include gold, palladium, platinum, and silver alloys. The reason for using these metals is that when the base ceramic is fired, oxygen is required for the ceramic proper to form.

Once the ink is dry, the sheets are stacked on top of each other. The painted electrodes are arranged so that alternate electrodes exit from opposite ends. The top- and bottom-most layers do not have painted electrodes. The laminated layers are then compressed and fired, which sinters them into one monolithic structure.

Next, the ends are terminated, often using silver. For leaded capacitors, wires are attached, and finally the capacitor is encapsulated in plastic and marked. In the case of chip capacitors, the silver end terminations are covered with tin to aid soldering. The whole capacitor may be covered with lacquer.

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Capacitors in Series Circuits

December 23, 2010 Views
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Capacitance can be decreased in a circuit by capacitors in series as shown in the following diagram:

We know that capacitance of a capacitor can be decreased by placing the plates further apart. Connecting two or more capacitors in series in effect increases the distance between the plates and thickness of the dielectric, thereby decreasing the amount of capacitance.

The following is the formula for calculating total capacitance in a circuit containing two capacitors in series:
CT = (C1 x C2x C3) / (C1 + C2+ C3)


Notes to uses of Aluminum Electrolytic Capacitors

December 22, 2010 Views
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Aluminum electrolytic capacitors ('capacitors') may cause explosion, fire, or other serious hazard if used outside the specified operating conditions. Please familiarize yourself with the instructions below before using these capacitors.

1.Check the operating and installation environment and use the capacitor within the range of the rated performance specified in the catalog or specifications.

2.Maintain operating temperature and ripple current within the specified ranges. Base your choice of capacitors on the maximum load conditions. A capacitor will overheat under excessive current, potentially resulting in short circuit, fire, or other major failure.

3.A capacitor also generates the self heating. Please bear in mind that the capacitor heats up the interior of the equipment, and take appropriate precautions. Operate the unit under normal conditions and check the temperature of the area surrounding the capacitor.

4.The permissible ripple current declines with the rise in ambient temperature (the temperature of the capacitor's surroundings).Consider the permissible ripple current at the maximum predictable ambient temperature.

5.Electric characteristics change as frequencies change. Check frequency changes in order to choose the right capacitor. Special attention needs to be given to the self heating and short life time both low and high frequency, when equivalent series resistance and inductance change.

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