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MKT100103M500T Datasheet(PDF) 3 Page - Sharma Electro Components,Inc |
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MKT100103M500T Datasheet(HTML) 3 Page - Sharma Electro Components,Inc |
3 / 29 page ELECTRICAL - BASIC PARAMETERS 1.1 RATED CAPACITANCE The nominal or rated value of capacitance is measured at 25 °C in an measuring bridge with 1K Hz source, free of harmonics. Please refer to relevant series for the range of capacitance value covered. Capacitance is frequency and temperature dependent. The variation pattern of capacitance with temperature and frequency is explained in sections 2.1 and 2.2. 1.2 CAPACITANCE TOLERANCE The permitted variation of actual value from the nominal value is termed the tolerance. The tolerance is expressed in percentage. The standard tolerances for plastic film capacitors are ±5% (J), ±10% (K) and ±20% (M). 1.3 RATED VOLTAGE The voltage at which the capacitor can operate continuously up to a temperature of 85 °C (unless otherwise specified) is the rated voltage. As this is a critical parameter for choosing a capacitor, the case sizes are listed in a matrix of capacitance value and rated voltage. 1.4 CATEGORY VOLTAGE The maximum voltage that may be applied continuously over the temperature range is termed the category voltage. This is same as the rated voltage up to 85 °C unless otherwise specified in the climactic category of the product. Above 85 °C a derating has to be applied depending upon the dielectric. 1.5 OPERATING TEMPERATURE This is the temperature range with in which the capacitor can function as specified in the climactic category. Please refer to relevant sections for derating above the temperature at which the full rated voltage can be applied. 1.6 DISSIPATION FACTOR This is the measurement of tangent of loss angle (tan d) and is expressed as a percentage. Measurement of dissipation factor is carried out at 1 K Hz. or 10 K Hz. as specified in the data sheet of the relevant series at 25 °C. Dissipation factor is temperature and frequency dependent. The nature of variation of dissipation factor with temperature and frequency for different dielectric are explained in Figures 2.3A to 2.3C and 2.4A to 2.4C. 1.7 INSULATION RESISTANCE Insulation Resistance is the electrical resistance offered by the capacitor. The Insulation Resistance is measured directly in Mega Ohms where as for higher capacitance values it is expressed in seconds as the product of M Ohm and µF. 1.8 PULSE RISE TIME The pulse rise time or dv/dt rating is the capability of the capacitor to handle rapid changes in voltage or pulse. This is expressed in terms of Volts per µseconds. The dv/ dt rating of a capacitor depends upon the dielectric as well as the design and construction of the capacitors. The dv/dt values of different types of capacitors are listed in the corresponding data sheets of the capacitors. ELECTRICAL - EFFECTS AND RELATIONS 2.1 TEMPERATURE DEPENDENCE OF CAPACITANCE Capacitance of plastic film capacitors vary with temperature. However the pattern of variation is different for different plastic film dielectrics such as Polystyrene, Polyester and Polypropylene. The The variation patterns for these dielectrics are shown in figure 2.1A, 2.1B and 2.1C. The rate of change of capacitance with temperature is termed the Temperature Coefficient. The nominal values of temperature coefficient for different dielectrics are shown below. 2.2 FREQUENCY DEPENDENCE OF CAPACITANCE Capacitance reduces with increase in frequency. The variation pattern for different dielectrics are shown in figure 2.2A, 2.2B and 2.2C. 2.3 TEMPERATURE DEPENDENCE OF DISSIPATION FACTOR The dissipation factor varies with temperature. Each dielectric follows a unique variation pattern. The variation pattern for different dielectrics are shown in figure 2.3A, 2.3B and 2.3C. PERFORMANCE CHARACTERISTICS Figure 2.1B Figure 2.1C Figure 2.2A Figure 2.2C Figure 2.2B Polyester Capacitance Change Vs. Temperature Polypropylene Capacitance Change Vs. Temperature Polystyrene Capacitance Change Vs. Frequency Polyester Capacitance Change Vs. Frequency Polypropylene Capacitance Change Vs. Frequency DIELECTRICS POLYSTYRENE POLYESTER POLYPROPYLENE TEMPERATURE COEFFICIENT -150 ppm +400 ppm -200 ppm Figure 2.1A Polystyrene Capacitance Change Vs. Temperature Sharma Film Capacitors |
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