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T491X105M035AS Datasheet(PDF) 7 Page - Kemet Corporation |
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T491X105M035AS Datasheet(HTML) 7 Page - Kemet Corporation |
7 / 100 page SOLID TANTALUM CHIP CAPACITORS of equilibrium with the environment, is approxi- mately -5% to +12% over the range from 25% to 95% RH, referred to the standard 50% RH. The amount of change is dependent upon size (capaci- tance and voltage rating, ie: CV product); small sizes might change no more than ±5%. Equilibrium at such extremes is seldom attained by plastic-cased capacitors, and the change in capacitance is consequently less. The rate of response to humidity changes increases with increasing temperature. Dissipation factor and ESR also increase with increasing RH. DC leakage current may rise upon exposure to a combination of high temperature and high humidi- ty, but is normally restored by voltage conditioning under standard conditions. The increase will be greater than that experienced under temperature influence alone because of conduction through absorbed water. Tantalum chips may be affected by absorption of water on external insulating surfaces.The water film may also attract a layer of dust from the air, increasing the effect. The most sensitive parame- ter is leakage current. 4. Capacitance • 0.1 µF to 1000 µF Refer to part number tables for available capaci- tance ratings and tolerances by series. Capacitance is measured at 120 Hz, up to 1.0 volt rms maximum and up to 2.5 volts DC maximum, at +25°C.DC bias causes only a small reduction in capaci- tance, up to about 2% when full rated voltage is applied. DC bias is not commonly used at room temperature, but is more commonly used at elevated temperatures. Capacitance decreases with increasing frequency. FIGURE 1 Typical Effect of Frequency upon Capacitance Capacitance increases with increasing temperature. FIGURE 2 Typical Effect of Temperature upon Capacitance Introduction KEMET solid tantalum capacitors are identified by the initial “T,” followed by a unique “Series” num- ber; for example, T491, T492, etc. Each Series denotes a general physical form and type of encapsulation, as well as limits on dimensions and certain electrical characteristics under standard conditions of 25°C, 50% relative humidity, and one atmosphere pressure. Specific requirements are set forth in the respective Product Series in this catalog. All series are 100% screened for leakage, capacitance, dissipation factor, and ESR. All Series are inspected to electrical limits using a minimum .1% AQL sampling plan, according to the Military Standard MIL-STD-105, even after 100% testing. This sampling plan, to the best of KEMET Electronics’ knowledge, meets or exceeds the generally accepted industry standard for simi- lar products. KEMET capacitors may also be sup- plied, with prior agreement, to meet specifications with requirements differing from those of KEMET cat- alogs. ELECTRICAL 1. General Application Class Solid tantalum capacitors are usually applied in circuits where the AC component is small com- pared to the DC component. Typical uses known to KEMET Electronics include blocking, by-pass- ing, decoupling, and filtering. They are also used in timing circuits. General purpose devices are rec- ommended to have an external series resistance of 0.1 Ω/volt to reduce the failure due to surge cur- rent. Newer devices designed for power applica- tions (T495, T5XX), are built to eliminate this series resistance requirement. Because tantalum capaci- tors can experience scintillation (self-healing) in their life, the circuit impedence should not exceed 100K Ω or this will circumvent the scintillation and degrade leakage. 2. Operating Temperature Range • –55 °C to +125 °C Voltage derating is specified in Section 5. Performance characteristics over this temperature range are presented within the following sections. 3. Non-Operating Temperature Range • –55 °C to +125 °C Tantalum capacitors do not lose capacitance from the “de-forming” effect as do liquid-electrolytic capacitors. Storage at high temperature may cause a small, temporary increase in leakage cur- rent (measured under standard conditions), but the original value is usually restored within a few min- utes after application of rated voltage. Tantalum chips are not hermetically sealed, there- fore they do exhibit reversible changes in parame- ters with respect to relative humidity (RH). Capacitance increases with increasing humidity. The limiting change, reached upon establishment TANTALUM MnO 2 COMPONENT PERFORMANCE CHARACTERISTICS +20% +10% 0 -10% -20% -80 -60 -40 -20 0 +20 +60 +40 +80 +100 +120 Operating Temperature— C ©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300 5 |
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