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T295C256M008ASC-0100 Datasheet(PDF) 7 Page - Kemet Corporation |
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T295C256M008ASC-0100 Datasheet(HTML) 7 Page - Kemet Corporation |
7 / 28 page © KEMET Electronics Corporation, P.O. Box 5928, Greenville, SC 29606 (864) 963-6300 Performance Characteristics Base Multiplier: The first multiplier is the base multi- plier (2) established for the capacitor type. For “CLR” “Tantalum Non-solid electrolyte” the base multiplier is 0.00040. Temperature: The temperature factor is given as (3). From this formula, it can be seen that the unity factor, or 1, is derived at an ambient temperature of +25°C (+298°K), and that at temperatures below this the mul- tiplier is decreasing and at temperatures above this the multiplier is increasing. Voltage: The multiplier for application voltage (4) is a two step process: first, the application voltage is com- pared to 60% of rated voltage, and then this ratio is raised to an exponential power of 17 and added to unity. Consider applications of 50%, 60%, 70%, 80% and 90% of rated voltage. The multipliers for these applications would be 1.045, 2.00, 14.7, 134, and 986, respectively. From these results it is evident why man- ufacturers recommend application voltages not to exceed 50% rated voltages. Capacitance: There is a factor (5) applied to the capacitance (in μF) which effectively increases the fail- ure rate for increasing capacitance (increases in effec- tive area resulting in increases in possible faults). Environmental: The environmental factor is determined by the harshness of the ambient conditions beyond tem- perature. An explanation of these ratings is included in the MIL specification and are too extensive to be cov- ered here. In most cases, this factor is set to ground benign or GB, with the resulting factor equal to “1”. Figure 6. MIL-HDBK-217F Notice 2 formulas. Quality Factor: All of these multipliers are applied to the established or base failure rate of the part. The CLR Series is qualified under U.S. military specification MIL- PRF-39006. Failure rates as low as 0.001% kHr are available under this test program. For series not covered by military specifications, an internal sampling program is operated by KEMET Quality Assurance whereby parts are put on life test at rated voltage for 2000 hours. The confidence level cho- sen for the reporting data is 60%. )The cost of sampling each batch would be prohibitive, and no claim is made to quarantee the failure rate of each batch.) With this test- ing and each new qualification test for new parts, the average failure rate for all commercial Series lies between 0.1% and 1.0% per thousand-piece-hours. Fit Calculator All of these factors are gathered into a Windows based software, available free from the KEMET web site (www.kemet.com). The “FIT Calculator” software does all the calculations and look-ups based on information entered or selected by the operator. A manual may also be downloaded from the same web page to explain the controls and displays. The Manual as well as a help screen also detail the environmental conditions. 17. Environmental Consideration It is not possible to foresee all the conditions to which capacitors may be subjected. Following is a list of standard tests which each Series will survive. Data may be available (upon request) under more severe stresses for certain Series. • Life Test 85°C or 125°C, 2000 Hours; when subjected to 2000 hours at 85°C at full rated DC voltage, or 125°C at 2/3 of 85°C voltage, the capacitor shall meet the following requirements when tested at 25°C. - The DCL shall be within 1.25 times the initial DCL limit. - Capacitance shall be within limits specified in MIL-PRF-39006. • Low Temperature (Storage) per MIL-PRF- 39006. Post test of capacitor shall meet the following requirements when tested at 25°C: - The DCL shall be within the initial DCL limit. - Capacitance shall be within limits in MIL-PRF- 39006. - The DF shall not exceed the initial limit. • Lead Strength MIL-STD-202 Method 211: Pull test will be performed as in MIL-STD-202, Method 211. The following details and excep- tions shall apply. a. Test condition letter - A b. The body of the capacitor will be securely clamped during test. c. Applied force - 3 pounds (1.4 kg) d. Duration of applied force: 30 seconds • Vibration; High Frequency: Per MIL-STD-202, Method 204, Condition D, 10 Hz to 2000 Hz. a. Mounting - Capacitors shall be mounted on a fixture by the body. Leads shall be supported by rigidly supported terminals b. Electrical load conditions - During the test, the specified DC rated voltage shall be applied to the capacitors. 7 |
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