MIL-PRF-11693 Capacitors, Feed Through, Radio-Interference Reduction, Dc \(Hermetically Sealed In Metal Cases\), Established And Non-Established Reliability General Specification ForThis specification covers the general requirements for established reliability \(ER\) and non-ER capacitors designed for operation with direct current \(dc\), paper, paper plastic, and plastic \(extended foil\) dielectric, radio-interference-reduction, feed-through capacitors, hermetically sealed in metal cases \(see 6.6.2\), for use primarily in broadband, radio-interference suppression application. Capacitors meeting the established reliability requirements specified herein have a maximum failure rate of 1.0 percent per 1,000 hours. This failure rate is established with a 90-percent confidence limit based on the life test parameters specified and are maintained at a 10-percent producer?╞s risk. An acceleration factor of 5:1 has been used to relate the life test data obtained at 140 percent of rated dc voltage at the applicable high test temperature to the rated voltage at the applicable high test temperature.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16

MIL-PRF-11693E

3.13 DC resistance. When measured as specified in 4.7.9, the dc resistance shall not exceed the value specified

(see 3.1).

3.14 Resistance to soldering heat. When tested as specified in 4.7.10, there shall be no damage to the capacitors

or the terminal insulators that will cause electrical failure of the capacitors, or which will cause hermetically sealed

capacitors to leak. Unless the chipping extends to the outer periphery, chipping of terminal insulators alone shall not

be cause for failure. Capacitors shall also meet the following requirements:

a. Insulation resistance: Not less than the value specified (see 3.1).

b. Capacitance: Change not more than the value specified (see 3.1).

c. Dissipation factor: Shall not exceed 1.5 percent.

3.15 Salt atmosphere (corrosion). When capacitors are tested as specified in 4.7.11, there shall be no harmful or

extensive corrosion and at least 90 percent of any exposed metallic surfaces of the capacitor shall be protected by

the finish. In addition, there shall be not more than 10-percent corrosion of the terminal hardware or mounting

surface. Marking shall remain legible after the test.

3.16 Thermal shock and immersion. When tested as specified in 4.7.12, capacitors shall meet the following

requirements:

a. Dielectric withstanding voltage: As specified in 3.8.

b. Insulation resistance (at +25�C): Not less than the value specified (see 3.1).

c. Capacitance: Change not more than the value specified (see 3.1) from the initial value obtained when

measured as specified in 4.7.6.

d. Dissipation factor: Shall not exceed 1.5 percent.

e. Insertion loss: Change at any frequency not more than 3 dB from the initial value obtained when measured

as specified in 4.7.8 except that for those frequencies at which the initial value is 60 dB or greater, the change

may exceed 3 dB provided the insertion loss does not drop below 60 dB.

f. Visual examination: There shall be no harmful or extensive corrosion and at least 90 percent of any exposed

metal surfaces of the capacitor shall be protected by the finish. In addition, there shall be not more than 10-

percent corrosion of the terminal hardware or mounting surface. Marking shall remain legible after the test.

3.17 Shock (specified pulse). When capacitors are tested as specified in 4.7.13, there shall be no intermittent

contacts of 0.5 millisecond (ms) or greater duration, open or short-circuiting and no mechanical damage to the

capacitors. After completion of the shock test, the units shall be subjected to the insertion loss test (see 4.7.8). The

change at any frequency shall be not more than 3 dB from the initial value obtained when measured as specified (see

3.1), except for those frequencies at which the initial value is 60 dB or greater, which may exceed 3 dB provided the

insertion loss does not drop below 60 dB.

3.18 Vibration, high frequency. When capacitors are tested as specified in 4.7.14 there shall be no intermittent

contacts of 0.5 ms or greater duration, open-circuiting, short-circuiting and no mechanical damage to the capacitors.

3.19 Moisture resistance. When tested as specified in 4.7.15, capacitors shall meet the following requirements:

a. Dielectric withstanding voltage: As specified in 3.8.

b. Insulation resistance (at +25�C): Not less than the value specified (see 3.1).

c. Capacitance: Change not more than the value specified (see 3.1) from the initial value obtained when

measured as specified in 4.7.6.