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C062G102J1C0G5CA Datasheet(PDF) 6 Page - Kemet Corporation |
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C062G102J1C0G5CA Datasheet(HTML) 6 Page - Kemet Corporation |
6 / 23 page © KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com 4 the aging rates to set factory test limits which will bring the capacitance within the specified tolerance at some future time, to allow for customer receipt and use. Typically, the test limits are adjusted so that the capacitance will be within the specified tolerance after either 1,000 hours or 100 days, depending on the manufacturer and the product type. POWER DISSIPATION Power dissipation has been empirically determined for two representative KEMET series: C052 and C062. Power dis- sipation capability for various mounting configurations is shown in Table 3. This table was extracted from Engineering Bulletin F-2013, which provides a more detailed treatment of this sub- ject. Note that no significant difference was detected between the two sizes in spite of a 2 to 1 surface area ratio. Due to the materials used in the construction of multilayer ceramic capac- itors, the power dissipation capability does not depend greatly on the surface area of the capacitor body, but rather on how well heat is conducted out of the capacitor lead wires. Consequently, this power dissipation capability is applicable to other leaded multilayer styles and sizes. TABLE 3 POWER DISSIPATION CAPABILITY (Rise in Celsius degrees per Watt) Power Mounting Configuration Dissipation of C052 & C062 1.00" leadwires attached to binding post 90 Celsius degrees of GR-1615 bridge (excellent heat sink) rise per Watt 10% 0.25" leadwires attached to binding post 55 Celsius degrees of GR-1615 bridge rise per Watt 10% Capacitor mounted flush to 0.062" glass- 77 Celsius degrees epoxy circuit board with small copper traces rise per Watt 10% Capacitor mounted flush to 0.062" glass- 53 Celsius degrees epoxy circuit board with four square inches rise per Watt 10% of copper land area as a heat sink As shown in Table 3, the power dissipation capability of the capacitor is very sensitive to the details of its use environ- ment. The temperature rise due to power dissipation should not exceed 20ºC. Using that constraint, the maximum permissible power dissipation may be calculated from the data provided in Table 3. It is often convenient to translate power dissipation capa- bility into a permissible AC voltage rating. Assuming a sinu- soidal wave form, the RMS “ripple voltage” may be calculated from the following formula: E = Z x Where E = RMS Ripple Voltage (volts) P = Power Dissipation (watts) Z = Impedence R = ESR P MAX R The data necessary to make this calculation is included in Engineering Bulletin F-2013. However, the following criteria must be observed: 1. The temperature rise due to power dissipation should be limited to 20ºC. 2. The peak AC voltage plus the DC voltage must not exceed the maximum working voltage of the capacitor. Provided that these criteria are met, multilayer ceramic capacitors may be operated with AC voltage applied without need for DC bias. RELIABILITY A well constructed multilayer ceramic capacitor is extremely reliable and, for all practical purposes, has an infi- nite life span when used within the maximum voltage and temperature ratings. Capacitor failure may be induced by sus- tained operation at voltages that exceed the rated DC voltage, voltage spikes or transients that exceed the dielectric with- standing voltage, sustained operation at temperatures above the maximum rated temperature, or the excessive tempera- ture rise due to power dissipation. Failure rate is usually expressed in terms of percent per 1,000 hours or in FITS (failure per billion hours). Some KEMET series are qualified under U.S. military established reliability specifications MIL-PRF-20, MIL-PRF-123, MIL- PRF-39014, and MIL-PRF-55681. Failure rates as low as 0.001% per 1,000 hours are available for all capacitance / voltage ratings covered by these specifications. These spec- ifications and accompanying Qualified Products List should be consulted for details. For series not covered by these military specifications, an internal testing program is maintained by KEMET Quality Assurance. Samples from each week’s production are sub- jected to a 2,000 hour accelerated life test at 2 x rated voltage and maximum rated temperature. Based on the results of these tests, the average failure rate for all non-military series covered by this test program is currently 0.06% per 1,000 hours at maximum rated conditions. The failure rate would be much lower at typical use conditions. For example, using MIL- HDBK-217D this failure rate translates to 0.9 FITS at 50% rated voltage and 50ºC. Current failure rate details for specific KEMET multilay- er ceramic capacitor series are available on request. MISAPPLICATION Ceramic capacitors, like any other capacitors, may fail if they are misapplied. Typical misapplications include expo- sure to excessive voltage, current or temperature. If the dielectric layer of the capacitor is damaged by misapplication the electrical energy of the circuit can be released as heat, which may damage the circuit board and other components as well. If potential for misapplication exists, it is recommended that precautions be taken to protect personnel and equipment during initial application of voltage. Commonly used precau- tions include shielding of personnel and sensing for excessive power drain during board testing. APPLICATION NOTES FOR MULTILAYER CERAMIC CAPACITORS |
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