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138D396X0100F2 Datasheet(PDF) 7 Page - Vishay Siliconix |
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138D396X0100F2 Datasheet(HTML) 7 Page - Vishay Siliconix |
7 / 8 page Document Number: 40025 For technical questions, contact: wettants@vishay.com www.vishay.com Revision: 17-Mar-08 23 138D Wet Tantalum Capacitors Sintered Anode TANTALEX® Capacitors Hermetically-Sealed with True Glass-to-Tantalum Seal Vishay PERFORMANCE CHARACTERISTICS (Continued) For example, percent dissipation factor of a 30 µF, 6 V capacitor, which has a maximum ESR of 3.4 Ω at + 25 °C and 120 Hz, would be calculated as shown: 7. Leakage Current: Measurements shall be made at the applicable rated working voltage at + 25 °C ± 5 °C through application of a steady source of power, such as a regulated power supply. The total resistance in series with each capacitor shall be between 1000 Ω and 10 000 Ω. The voltage shall be applied to the capacitor for 5 minutes before making the leakage current measurement. 7.1 The maximum leakage current for any capacitor shall not exceed the value in microamperes listed in the Standard and Extended Ratings Table for each capacitor. Note: leakage current varies with applied voltage. See graph below for the appropriate adjustment factor. 8. Low Temperature Impedance: The impedance of any capacitor at - 55 °C at 120 Hz, shall not exceed the values given in the Standard and Extended Ratings Tables. 9. Life Test: Capacitors are capable of withstanding a 2000 h life test at a temperature of + 85 °C or + 125 °C at the applicable rated DC working voltage. 10. High Frequency Vibration: Capacitors shall with stand vibration from 10 Hz to 2000 Hz at 20 g when tested. 11. Lead Pull Test: Capacitors shall withstand a lead tensile stress of 3 pounds (13.2 N) for 30 s, applied axially. 12. Marking: Capacitors shall be marked with Sprague® and/or the Sprague trademark 2, the Sprague type (138D); rated capacitance and tolerance (the tolerance shall be coded, using the list shown in How to Order); rated DC working voltage at + 85 °C; the standard EIA date code of manufacture. GUIDE TO APPLICATION 1. Ripple Current: All capacitors will withstand rms ripple currents as listed for each capacitor. 1.1 The rms ripple current rating is independent of temperature or frequency within the following limitations: 1.1.1 At frequencies of less than 120 Hz, the rated rms ripple current must be multiplied by the factors shown: 1.1.2 The sum of the peak AC voltage plus the DC voltage shall not exceed the DC working voltage of the capacitor. 1.1.3 The sum of the negative peak AC voltage, plus the applied DC voltage shall not allow a voltage reversal. 2. Cleaning wiring boards with Type 138D capacitors: Customary cleaning solvents used in the electronics industry at present will not affect Type 138D capacitors. However, the use of ultrasonic cleaning techniques is not recommended under any circumstances. 3. Apparent Capacitance: Note that in timing circuit applications, the circuit designer must take into account two important variables which affect any electrolytic capacitor. These are the internal leakage resistance of the capacitor and its dielectric absorption, which will depend on the elapsed time since the capacitor was last energized. In applications where electrolytic capacitors are subjected to DC energy, or in effect, extremely low frequencies, the value of the apparent capacitance will be somewhat higher than that which is measured at 120 Hz. 4. No Reverse Voltage: The application of reverse voltage to these capacitors will cause internal damage. The resulting damage will lead to immediate or delayed failure of the unit. This will take the form of a catastrophic short circuit with possible expulsion of the electrolyte. LEAKAGE AS A FUNCTION OF VOLTAGE & TEMPERATURE DF 2 π 120 × 3.4 × 30 × 10 4 -------------------------------------------------- 3.4 30 × 13.26 --------------------- 7.7 % == = 1.0 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 PERCENT OF RATED VOLTAGE 10 30 20 90 40 50 60 70 80 100 FREQUENCY IN HERTZ 25 50 60 100 0.36 0.59 0.65 0.88 |
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