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T290D256M008ASC-0100 Datasheet(PDF) 3 Page - Kemet Corporation |
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T290D256M008ASC-0100 Datasheet(HTML) 3 Page - Kemet Corporation |
3 / 28 page Performance Characteristics © KEMET Electronics Corporation, P.O. Box 5928, Greenville, SC 29606 (864) 963-6300 Introduction KEMET wet tantalum capacitors are identified by the initial “T”, followed by a “Series” number. T19X des- ignates commercial product; T29X is military grade in accordance with Military Specification, MIL-PRF- 39006. For detailed performance characteristics of the T29X series, please refer to the latest issue of the Military Specification. MIL-PRF-39006 establishes 1000 hour failure rate levels of 1%, 0.1%, and 0.01%. T29X series components are available in M, P, and R failure rates (1.0, 0.1, and 0.01, respectively). Specific requirements are set forth in the respec- tive Product Series in this catalog. All Military products are 100% electrically screened for the parameters shown in the respective product section. For non-mili- tary product, all series are 100% screened for leakage, capacitance and dissipation factor. All Series are inspected to electrical limits using a minimum .1% AQL sampling plans, 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 similar products. KEMET capacitors may also be sup- plied, with prior agreement, to meet specifications with requirements differing from those of KEMET catalogs. These Notes apply generally to all KEMET wet tan- talum capacitors and illustrate typical performance under normal application conditions, except where noted. The intent of these Notes is to provide general- ized information concerning performance characteris- tics. 1. General Application Class Wet tantalum capacitors are usually applied in cir- cuits where the AC component is small compared to the DC component. Typical uses known to KEMET Electronics include blocking, by-passing, decoupling, and filtering. They are also used in timing circuits. If two of these polar capacitors are connected “back-to-back” (i.e., negative-to-negative or positive-to-positive), the pair may be used in AC applications (as a non-polar device). 2. Storage Conditions Capacitors may be stored without applied voltage over the operating temperature range specified in the catalogs for each Series. The range is from -55 to +125°C for all Series. Storage at high temperature may cause a small, temporary increase in leakage current (measured under standard conditions), but the original value is usually restored within a few minutes after application of rated voltage. DC leakage current may rise upon exposure to a combination of high temperature and high humidity, 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. This Series 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 parameter is leakage current. 3. Polarity These capacitors are inherently polar devices and may be permanently damaged or destroyed if connect- ed with the wrong polarity. The positive terminal is iden- tified on the capacitor body by a polarity mark and the capacitor body may include an obvious geometrical shape. See paragraph 11 for Reverse Voltage capabil- ities. 4. Operating Environment Most of the discussion under “Storage Conditions” will apply also when capacitors are operated within the applicable electrical ratings described below. The tem- porary increase in leakage current (at standard condi- tions) following elevated-temperature exposure is not observed, however, if the capacitors are operated with adequate DC voltage applied. 5. Capacitance Capacitance is measured at 120 Hz and 25°C with up to 1 volt rms applied. Measured circuits are of high impedance, however, and under these conditions 1 volt rms may be applied even to 6 volt capacitors (23% peak reversal) without a DC dias. DC bias is thus nor- mally not used, except when rated voltage is below 6 volts and the AC signal level exceeds 0.3 vrms. However, MIL-PRF-39006 provides for up to 2.2 volts DC. DC bias is not commonly used at room tempera- ture, but is more commonly used at elevated tempera- tures. DC bias causes a small reduction in capacitance, up to about 2% when full rated voltage is applied as bias. DF is also reduced by the presence of DC. Capacitance changes very little below 1 kHz but decreases more noticably at higher frequencies. Larger capacitance values decline more rapidly than small rat- ings. Capacitance typically changes with temperature according to the curve of Figure 1. Figure 1. Typical Effect of Temperature upon Capacitance 3 |
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