Capacitors Blog

Now Suntan can support shorter lead time than other manufacturers on below series.

Mini Box Metalized Polyester Film Capacitor, only 5~6 weeks. Hot Offer Now!

General TS05 series: http://www.suntan.com.hk/pdf/Plastic-Film-Capacitors/TS05.pdf

Stacked TS05S series: http://www.suntan.com.hk/pdf/Plastic-Film-Capacitors/TS05S.pdf

Dipped Tantalum Capacitor TS19 series: http://www.suntan.com.hk/pdf/Tantalum-Capacitors/TS19.pdf

Besides, we now have strong support on our trimming potentiometer.

Trimming Potentiometer TSR series: http://www.suntan.com.hk/Trimming-Potentiometers/

If you have any requirement for these, please do check details with our experienced sales!

Capacitors do not behave the same as resistors. Whereas resistors allow a flow of electrons through them directly proportional to the voltage drop, capacitors oppose changes in voltage by drawing or supplying current as they charge or discharge to the new voltage level. The flow of electrons “through” a capacitor is directly proportional to the rate of change of voltage across the capacitor. This opposition to voltage change is another form of reactance, but one that is precisely opposite to the kind exhibited by inductors.

The expression de/dt is one from calculus, meaning the rate of change of instantaneous voltage (e) over time, in volts per second. The capacitance (C) is in Farads, and the instantaneous current (i), of course, is in amps. Sometimes you will find the rate of instantaneous voltage change over time expressed as dv/dt instead of de/dt: using the lower-case letter “v” instead or “e” to represent voltage, but it means the exact same thing. To show what happens with alternating current, let's analyze a simple capacitor circuit below.

When an aluminum electrolytic capacitor is stored under no load conditions for a long period of time, its leakage current tends to increase slightly. This is due to a drop in the withstand voltage of the dielectric caused by the reaction of the anode oxide layer with the electrolyte. When the voltage is applied to the capacitor, the leakage current returns to its initial level because of the re-forming action of the electrolyte (called voltage treatment). If the storage temperature is high, the leakage current will increase substantially. Therefore, it is desirable to store capacitors at normal temperature level with no direct sunlight. A voltage treatment is recommended when using a capacitor stored for a long period of time. The treatment for an individual capacitor is accomplished by charging up to its rated voltage through a resistance of about 1 kΩ and applying the voltage for approximately 30 minutes.