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T191C256K008ASC-0100 Datasheet(PDF) 4 Page - Kemet Corporation |
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T191C256K008ASC-0100 Datasheet(HTML) 4 Page - Kemet Corporation |
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4 / 28 page  © KEMET Electronics Corporation, P.O. Box 5928, Greenville, SC 29606 (864) 963-6300 6. Dissipation Factor (DF) DF is measured at 120 Hz and 25°C with up to 1 volt rms applied. Note that, in either operation, peak AC plus DC bias must not exceed either rated voltage Measurement 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 bias. DC bias is thus normally not used, except when rated voltage is below 6 volts and the AC signal level exceeds 0.3 vrms. However, MIL-PRF-39006 pro- vides for up to 2.2 volts DC. DC bias is not commonly used at room temperature, but is more commonly used at elevated temperatures. Dissipation Factor (DF) is a useful low-frequency measure of the resistive component in capacitors. It is the ration of the unavoidable resistance to the capaci- tive reactance, usually expressed in percent. DF increases with temperature above +25°C and may also increase at lower temperatures. Unfortunately, one general limit for DF cannot be specified for all capaci- tance/voltage combinations, nor can response to tem- perature be simply stated. Catalogs for the respective series list DF limits under various conditions. Dissipation factor increases with increasing fre- quency as would be expected from the decreasing capacitive reactance. DF is not a very useful parame- ter above about 1 kHz. The DF of larger capacitance values increases more rapidly than that of smaller rat- ings. 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 bias. Rated voltage may cause a decrease in DF of about 0.2% (e.g., a decrease from 3.6 to 3.4% DF). DF is defined as ESR and is also referred to occa- Xc sionally, as tan d or “loss tangent.” The Quality Factor”, Q, is the reciprocal of DF (DF is not expressed in per- cent in this calculation). Another expression, rarely used is the “power factor,” or ESR. Power factor is cos Ø, while DF is cot Ø. Z 7. DC Leakage (DCL) DC leakage is affected by voltage to a much larger extent, and this effect can frequently be used to advan- tage in circuits where only very low leakage currents can be tolerated. Figure 2. Typical Effect of Temperature upon DC Leakage Current DC leakage current (DCL) increases with increasing temperature according to the typical curve of Figure 2. Leakage current is measured at a rated voltage through +85°C and may also be measured at +125°C with 2/3 of rated voltage applied. 8. Rated Voltage This term refers to the maximum continuous DC working voltage permissible at temperatures of +85°C or below. The lower operating temperature is specified as -55°C. Operation above +85°C is permissible, with reduced working voltage. The typical working voltage reduction is to 2/3 of rated voltage at +125°C. 9. Working Voltage This is the maximum recommended peak DC oper- ating voltage for continuous duty at or below 85°C with- out DC voltage surges or AC ripple superimposed. No voltage derating is required below 85°C. Capacitors may be operated to 125°C with working voltage linearly der- ated to 2/3 of the 85°C rating at 125°C. Figure 3. Working Voltage Change with Temperature 10. Surge Voltage Surge Voltage is defined as the maximum voltage to which the capacitor should be subjected under tran- sient conditions, including peak AC ripple and all DC transients. Table 1. Surge Voltage Ratings A typical surge voltage test is performed at +85°C with the applicable surge voltage per Table 1. The surge voltage is applied for 1000 cycles of 30 seconds on voltage through a 1000 ± 100 ohm series resistor and 30 seconds off voltage with the capacitor dis- charged through a 1,000 ohm resistor. Upon complet- ing the test, the capacitors are allowed to stabilize at room temperature. Capacitance, DF, and DCL are then tested: 1. The DCL should not exceed the initial 25°C limit. 2. The capacitance should be within ±2% of initial value. 3. The DF should not exceed the initial 25°C limit. 4 DC Working Voltage @ 85°C 6 8 10 15 25 30 50 60 75 100 125 Surge Voltage 6.9 9.2 11.5 17.2 28.8 34.5 57.5 69 86.2 115 144 |
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