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T491C154K035AG Datasheet(PDF) 10 Page - Kemet Corporation |
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T491C154K035AG Datasheet(HTML) 10 Page - Kemet Corporation |
10 / 100 page SOLID TANTALUM CHIP CAPACITORS ©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300 ESR — Represents the actual ohmic series resis- tance in series with the capacitance. Lead wires and capacitor electrodes are contributing sources. R L — Capacitor Leakage Resistance. Typically it can reach 50,000 megohms in a tantalum capaci- tor. It can exceed 10 12 ohms in monolithic ceram- ics and in film capacitors. R d — The dielectric loss contributed by dielectric absorption and molecular polarization. It becomes very significant in high frequency measurements and applications. Its value varies with frequency. C d — The inherent dielectric absorption of the solid tantalum capacitor which typically equates to 1-2% of the applied voltage. As frequency increases, X C continues to decrease according to its equation above. There is unavoid- able inductance as well as resistance in all capaci- tors, and at some point in frequency, the reac- tance ceases to be capacitive and becomes inductive. This frequency is called the self-reso- nant point. In solid tantalum capacitors, the reso- nance is damped by the ESR, and a smooth, rather than abrupt, transition from capacitive to inductive reactance follows. Typical ESR/Z frequency response curves are shown in Figures 9a and 9b. These curves are for selected ratings and represent typical T491 Series performance. Maximum limits for 100 kHz ESR are listed in the part number tables for each series. Note that the T494 Series offers low ESR and the T495 Series is specially designed for very low ESR performance. Refer to page 31 for more information. See also KEMET’s T510 Series low ESR ratings on page 40. 8 TANTALUM MnO 2 COMPONENT PERFORMANCE CHARACTERISTICS (con’t.) FIGURE 7a Total Impedance of the Capacitor Below Resonance FIGURE 7b Total Impedance of the Capacitor Above Resonance To understand the many elements of a capaci- tor, see Figure 8. X C = 1 ohm 2 fC where: f = frequency, Hertz C = capacitance, Farad X L = 2 fL where: f = frequency, Hertz L = inductance, Henries A capacitor is a complex impedance consisting of many series and parallel elements, each adding to the complexity of the measurement system. ESL — Represents lead wire and construction inductance. In most instances (especially in solid tantalum and monolithic ceramic capacitors) it is insignificant at the basic measurement frequen- cies of 120 and 1000 Hz. FIGURE 8 The Real Capacitor ESL ESR C RL Cd Rd FIGURE 9a ESR & Impedance (Z) vs Frequency |
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