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T491R334K035AG Datasheet(PDF) 8 Page - Kemet Corporation |
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T491R334K035AG Datasheet(HTML) 8 Page - Kemet Corporation |
8 / 100 page Surge voltage tests are performed at +25°C, +85°C and +125°C with the applicable surge volt- age. The surge voltage is applied for 1000 cycles of 30 seconds at voltage through a 33 ohm series resistor and 30 seconds off voltage with the capacitor discharged through a 33 ohm resistor. Upon completing the test, the capacitors are allowed to stabilize at room temperature. Capaci- tance, DCL and DF are then tested: a. Capacitance — within ± 5% of initial value b. DC Leakage — within initial limit c. Dissipation Factor — within initial limit d. ESR — within initial limit 7. Reverse Voltage and Polarity TABLE 3 Reverse Voltage Ratings Temperature Permissible Reverse Voltage +25°C 15% of Rated Voltage +85°C 5% of Rated Voltage +125°C 1% of Rated Voltage Solid tantalum capacitors are polarized devices and may be permanently damaged or destroyed if connected with the wrong polarity. The positive terminal is identified on the capacitor body by a stripe and a beveled edge. A small degree of tran- sient reverse voltage is permissible for short peri- ods per Table 3. The capacitors should not be operated continuously in reverse mode, even with- in these limits. 8. DC Leakage Current (DCL) Refer to part number tables for maximum leakage current limits. DC leakage current is the current that, after a one- to five-minute charging period, flows through a capacitor when voltage is applied. Leakage is measured at +25°C with full rated DC voltage applied to the capacitor through a 1000 ohm resis- tor in series with the capacitor. DC leakage current increases with increasing tem- perature. TABLE 4 Leakage Limit Multipliers at Specified Temperatures (ref: 25°C limits) Ambient Temperature –55°C +85°C +125°C N/A 10X 12X TABLE 1 Maximum Capacitance Change with Temperature (ref: 25°C) Ambient Temperature –55°C +85°C +125°C –10% +10% *+12% or +15%to20% *+12% is standard. +15% and 20% apply to certain extended CV values as noted in part number tables. 5. Working DC Voltage (WVDC) • 3 to 50 volts Refer to part number tables for available voltage ratings by series. These voltages are the maximum recommended peak DC operating voltages from –55°C to +85°C for continuous duty. These voltages are derated linearly above +85°C to 2/3 rated voltage for operation at +125°C (See Figure 3). For added reliability it is recommended to operate at a 50% derating of the working voltage for tantalum capacitors with MnO 2 as a cathode. See page 39 for working DC Voltage of high temperature T498 product. FIGURE 3 Working DC Voltage Change with Temperature 6. Surge Voltage TABLE 2 Surge Voltage Ratings at +25°C, +85°C & +125°C Rated Working Surge Derated Volts Voltage DC Surge @ +25°C @ +25°C Volts Voltage & +85°C & +85°C @ +125°C @ +125°C 3 4 2 2.4 4 5.2 2.7 3.2 68 4 5 10 13 7 8 16 20 10 12 20 26 13 16 25 33 17 20 35 46 23 28 50 65 33 40 SOLID TANTALUM CHIP CAPACITORS 100% 80% 60% 40% 20% -60 Operating Temperature— C -40 -20 0 +20 +40 +60 +80 +100 +120 +140 ©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300 6 TANTALUM MnO 2 COMPONENT PERFORMANCE CHARACTERISTICS (con’t.) |
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