Kt Kingtronics Capacitors

15 Jun 2011

Capacitors are devices which store electric charge. They are usually made from two parallel metal surfaces with some insulating dielectric layer between them. If one of the plates is charged, and the other is grounded,  opposite charges will accumulate on it  by influence, while the net charge stays zero. The capacitance is the magnitude of charge on one plate Q divided by the voltage V across the plates.

The unit of capacitance is the farad. 1 F = 1As/V

The capacitance of two parallel metal plate of area A and d distance apart (supposed that the lateral sizes of the plates are much bigger than the distance between them) is

where e is called the permittivity of the insulating material between the plates.

The permittivity of vacuum is e0 = 8.85 ×10-12 As/(Vm).

The capacitance can be increased by applying high permittivity material between the metal plates, like paper, plastic, oil, mica, or ceramic. Typical capacitance values range from about 1 picofarad (pF, 10-12 F) about 1000 microfarads (mF, 10-6 F)

The symbol for capacitor in circuit diagrams is:

The capacitors are rated according to the voltage that can be safely applied across their terminals - breakdown voltage.

The energy stored in a capacitor is

Electrolytic capacitors use aluminium or tantalum plates immersed in a semi-liquid chemical compound which forms a thin insulating oxide layer on one of the electrodes. These types of capacitors are said to be polarized and can be used only in such way that the terminal denoted by “+” is always at higher potential as the “–“ one. Because of the thin oxide layer, the capacitance of the electrolytic capacitor is usually high, 1-1000 mF.

Dipped tantalum capacitors also have high capacitance but small size at the same time. They are made of a sintered tantalum powder core. Because of the pores, it surface is very large. The core is oxidized. The core is dipped into manganese nitrate solution,  than put in a furnace where  the nitrate decomposes into manganese oxide which fills the pores and serves as the other electrode to the capacitor.

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Kingtronics International Company was established in 1995 located in Dongguan City of China to handle all sales & marketing for factories located in Chengdu, Sichuan and Zhaoqing, Guangdong, China. In 1990, we established the first factory to produce trimming potentiometer and in 1999 we built up new factory in Zhao Qing, Guangdong. Now with around 850 workers, Kingtronics produce trimming potentiometers, dipped tantalum capacitors, multilayer ceramic capacitors, and diode & bridge rectifier. We sell good quality under our brand Kingtronics, and Kt, King, Kingtronics are our three trademarks. All our products are RoHS compliant, and our bridge rectifier have UL approval. Please visit our Products page, you could please download all our PDF datasheet and find cross reference for our Trimming Potentiometer and capacitors.

Tantalum and Ceramic Capacitors Cross Reference ↓ Download
Diodes & Rectifiers List(PDF: 97KB) ↓ Download
Trimming Potentiometer Cross Reference ↓Download

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