Suntan Blog

Capacitance value measured at 1 MHz will be within tolerance limits.
Capacitors will withstand two times the rated voltage for one to five seconds without arcing. The charging current is limited to 50 mA.
Insulation resistance will be greater than 100,000 megaohms when measured at 100V DC.
D.F. as per graph below.

(for C < 80 pf and C > 1000 pf )
Operating temperature (-) 55° C to (+) 125° C.

A capacitor (formerly known as condenser) is a passive electronic component consisting of a pair of conductors separated by a dielectric (insulator). When there is a potential difference (voltage) across the conductors a static electric field develops in the dielectric that stores energy and produces a mechanical force between the conductors. An ideal capacitor is characterized by a single constant value, capacitance,measured in farads. This is the ratio of the electric charge on each conductor to the potential difference between them.

Capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass, in filter networks, for smoothing the output of power supplies, in the resonant circuits that tune radios to particular frequencies and for many other purposes.

Most types of capacitor include a dielectric spacer, which increases their capacitance. These dielectrics are most often insulators. However, low capacitance devices are available with a vacuum between their plates, which allows extremely high voltage operation and low losses. Variable capacitors with their plates open to the atmosphere were commonly used in radio tuning circuits. Later designs use polymer foil dielectric between the moving and stationary plates, with no significant air space between them.

In order to maximise the charge that a capacitor can hold, the dielectric material needs to have as high a permittivity as possible, while also having as high a breakdown voltage as possible.

Suntan X2 Metallized Polyester Film Capacitors are an excellent choice for a wide range of electrical applications. One of the most important features of a quality film capacitor is the purity of the film. Every X2 capacitor is manufactured with high purity DuPont film, to insure a higher level of performance when compared to our competitors. Most of our competitors are using a low grade of Chinese film in their metallized polyester caps. Great care is taken during the manufacturing process to insure tight winding of the foil to prevent microphonic distortion and tight tolerances. These X2 metallized polyester film caps are perfect for crossover networks and are a higher quality alternative to non polar caps.

Suntan X2 Metallized Polyester Film Capacitors are Lead Free (RoHS Compliant) and available in many stocked and un-stocked values.

When measured at room temperature (25°C ± 5°C) and at a frequency of 0.1 to 1 Megahertz, the minimum capacitance shall not be greater than that specified at minimum setting  with a +10% tolerance and the maximum capacitance shall not be less than that specified maximum setting with a - 10% tolerance.

The capacitance drift shall be determined as the greatest difference between any two of the three 25°C measurements obtained during the temperature characteristic test.  The capacitance drift shall not exceed 0.75% or 0.5pF, whichever is greater.

SMD Trimming Potentiometers, Rectangular Trimming Potentiometers, Wirewould Trimming Potentiomers, Phenolic Trimming Potentiometers and 5, 6, 7, 8, 9 terminal Trimming Potentiometers etc is one types of a Trimming Potentiometers. All these types are supplied by our Suntan. With High quality , Competitive price ,Short delivery Suntan Mark is famous in the overseas Electrical market.

In analog computers, high precision potentiometers are used to scale intermediate results by desired constant factors, or to set initial conditions for a calculation. A motor-driven potentiometer may be used as a function generator, using a non-linear resistance card to supply approximations to trigonometric functions. For example, the shaft rotation might represent an angle, and the voltage division ratio can be made proportional to the cosine of the angle.

Suntan Each series is introduced with different drawing, including typical electrical & environmental Characteristics, mounting detail tolerance, and special resistances are also available. Our these 6mm & 8mm Trimmer series are hot selling with good quality, orders keep increasing each month.

In an electrical double layer, each layer by itself is quite conductive, but the physics at the interface where the layers are effectively in contact means that no significant current can flow between the layers. However, the double layer can withstand only a low voltage, which means that electric double-layer capacitors rated for higher voltages must be made of matched series-connected individual EDLCs, much like series-connected cells in higher-voltage batteries.

EDLCs have much higher power density than batteries. Power density combines the energy density with the speed that the energy can be delivered to the load. Batteries, which are based on the movement of charge carriers in a liquid electrolyte, have relatively slow charge and discharge times. Capacitors, on the other hand, can be charged or discharged at a rate that is typically limited by current heating of the electrodes. So while existing EDLCs have energy densities that are perhaps 1/10 that of a conventional battery, their power density is generally 10 to 100 times as great.

The capacitor (C) in the circuit diagram is being charged from a supply voltage (Vs) with the current passing through a resistor (R). The voltage across the capacitor (Vc) is initially zero but it increases as the capacitor charges. The capacitor is fully charged when Vc = Vs. The charging current (I) is determined by the voltage across the resistor (Vs - Vc):

Charging current, I = (Vs - Vc) / R   (note that Vc is increasing)

At first Vc = 0V so the initial current, Io = Vs / R

Vc increases as soon as charge (Q) starts to build up (Vc = Q/C), this reduces the voltage across the resistor and therefore reduces the charging current. This means that the rate of charging becomes progressively slower.

Ceramic capacitors have become the preeminent, general purpose capacitor, especially in SMT chip devices where their low cost makes them especially attractive.  With the emergence of thinner-dielectric, multilayer units with rated voltages of less than 10 V capacitance values in the hundreds of microfarads have become available.  This intrudes on the traditional, high-capacitance province of aluminum electrolytic capacitors.

Ceramic capacitors are not polarized and therefore can be used in AC applications.  The low DF and high capacitance stability of Class 1 and 2 are especially suited to AC and RF applications.