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Sunday, 25 June 2017

What is SMD Capacitor - English

What is SMD Capacitor - English 

SMD capacitors are used in vast quantities within the manufacture of all forms of electronic equipment.
After SMD resistors they are the most widely used type of component.
There are many different types of SMD capacitor ranging from ceramic types, through tantalum varieties to electrolytics and more. Of these, the ceramic SMD capacitors are the most widely used

SMD capacitor basics

Surface mount capacitors are basically the same as their leaded predecessors. However instead of having leads they have metallised connections at either end.
This has a number of advantages:
  • Size:   SMD capacitors can be made very much smaller than their leaded relations. The fact that no wired leads are required means that different construction techniques can be sued and this allows for much smaller components to be made.
  • Ease of use in manufacturing:   As with all other surface mount components, SMD capacitors are very much easier to place using automated assembly equipment.
  • Lower spurious inductance:   The fact that no leads are required and components are smaller, means that the levels of spurious inductance are much smaller and these capacitors are much nearer the ideal component that their leaded relations.

Multilayer ceramic SMD capacitors

The multilayer 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.
Construction:   The multilayer ceramic SMD capacitor consists of a rectangular block of ceramic dielectric in which a number of interleaved precious metal electrodes are contained. This multilayer structure gives rise to the name and the MLCC abbreviation, i.e. Multi-Layer Ceramic Capacitor.
This structure gives rise to a high capacitance per unit volume. The inner electrodes are connected to the two terminations, either by silver palladium (AgPd) alloy in the ratio 65 : 35, or silver dipped with a barrier layer of plated nickel and finally covered with a layer of plated tin (NiSn).
Ceramic capacitor manufacture:   The raw materials for the dielectric are finely milled and carefully mixed. Then they are heated to temperatures between 1100 and 1300°C to achieve the required chemical composition. The resultant mass is reground and additional materials added to provide the required electric properties.
The next stage in the process is to mix the finely ground material with a solvent and binding additive. This enables thin sheets to be made by casting or rolling.
For multilayer capacitors electrode material is printed on the sheets and after stacking and pressing of the sheets co-fired with the ceramic compact at temperatures between 1000 and 1400°C. The totally enclosed electrodes of a multilayer capacitor ceramic capacitor, MLCC guarantee good life test behaviour as well.

Capacitor Symbol 

Capacitor Show by " C " 

Capacitor Unit - Farad 
1 Farad (F) is equal 1000000 Microfarads (µF
1 Microfarad (µF) is equal 1000000 Picofarads (pF)

Capacitor Type 

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