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T491V154M035AS Datasheet(PDF) 9 Page - Kemet Corporation |
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T491V154M035AS Datasheet(HTML) 9 Page - Kemet Corporation |
9 / 100 page SOLID TANTALUM CHIP CAPACITORS TANTALUM MnO 2 COMPONENT PERFORMANCE CHARACTERISTICS (con’t.) ©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300 7 FIGURE 4 Typical Effect of Temperature upon DC Leakage Current DC leakage current decreases with decreasing applied voltage. FIGURE 5 Typical Effect of Applied Voltage on DC Leakage Current. 9. Dissipation Factor (DF) Refer to part number tables for maximum DF limits. Dissipation factor is measured at 120 Hz, up to 1.0 volt rms maximum, and up to 2.0 volts DC maximum at +25°C. The application of DC bias causes a small reduction in DF, about 0.2% when full rated voltage is applied. DF increases with increasing frequency. Frequency — Hertz FIGURE 6 Typical Effect of Frequency upon Dissipation Factor Dissipation factor is a very useful low frequency (120 Hz) measurement of the resistive component of a capacitor. It is the ratio of the equivalent series resistance (ESR) to the capacitive reactance, (X C) and is usually expressed as a percentage. It is directly proportional to both capacitance and fre- quency. Dissipation factor loses its importance at higher frequencies, (above about 1 kHz), where impedance (Z) and equivalent series resistance (ESR) are the normal parameters of concern. DF = R = 2 fCR DF = Dissipation Factor X C R = Equivalent Series Resistance (Ohms) X C = Capacitive Reactance (Ohms) f = Frequency (Hertz) C = Series Capacitance (Farads) DF is also referred to as tan or “loss tangent.” The “Quality Factor,” “Q,” is the reciprocal of DF. DF decreases with temperature above +25°C and may also increase at lower temperatures. Unfortunately, one general limit for DF cannot be specified for all capacitance/voltage combinations, nor can response to temperature be simply stated. DC bias is not commonly used at room tempera- ture, but is more commonly used at elevated tem- peratures. 10. Equivalent Series Resistance (ESR) and Impedance (Z) Equivalent Series Resistance (ESR) is the pre- ferred high-frequency statement of the resistance unavoidably appearing in these capacitors. ESR is not a pure resistance, and it decreases with increasing frequency. Total impedance of the capacitor is the vector sum of capacitive reactance (X C) and ESR, below resonance; above resonance total impedance is the vector sum of inductive reactance (X L) and ESR. 10.0 1.0 0.1 Operating Temperature— C -60 -40 -20 0 +20 +40 +60 +80 +100 +125 Reference 1.0 at + 25 °C Percentage of Rated Voltage 0 102030405060708090 100 110 1.0 0.1 0.01 0.001 100 1k 10k 20.0 10.0 5.0 1.0 Reference 1.0 at 120 Hz |
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