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

b. Test temperature and tolerance: The applicable high temperature specified in table II (see 3.1).

c. Operating conditions: A potential of 140 percent of the rated dc voltage shall be applied between the terminal

and the case. Rated current shall be flowing through the feed through conductors (see 3.1).

d. Test condition: F (2,000 +96, -0 hours) for ER parts and 240 +48, -0 for non-ER parts.

e. Measurements after exposure: Capacitors shall be returned to the inspection conditions specified in 4.3, and

shall be visually examined for leakage of impregnant or filling compound and deformation of case. Insulation

resistance at +25�C, capacitance, dissipation factor, and insertion loss shall then be measured as specified in

4.7.19.2 Life (Conformance inspection).

4.7.19.2.1 240 hour (group B inspection) (see 3.23). Capacitors shall be tested as specified in 4.7.19.1, except

that the duration of the test shall be 240 +48, 0 hours.

4.7.19.2.2 2,000 hour (group B inspection) (ER parts only) (see 3.23). Capacitors shall be tested as specified in

4.7.19.1, except the duration of the test shall be 2,000 +96, -0 hours.

4.7.20 Flashpoint of impregnant or filling compound (see 3.24). This test is applicable only to liquid impregnants

and filling compounds and to solid impregnants having a melting point of less than +135�C. The flashpoint of the

impregnant or filling compound shall be measured as specified in ASTM D92, except that fire point and precision do

not apply. "Impregnant or filling compound" shall be substituted for the word "oil" throughout the test method.

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order

(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel

need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are

maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or

within the military service's system commands. Packaging data retrieval is available from the managing Military

Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible

packaging activity.

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. The capacitors covered by this specification are primarily designed for use in broadband, radio-

interference suppression applications. They are military unique due to the fact that they must be able to operate

satisfactorily in military systems under the following demanding conditions: -55�C to +85�C or +125�C operating

temperature range, 15 Gs of vibration, 50 - 100 Gs of shock, 48 hours of salt spray, 2,000 hours of use at the

maximum temperature and 140 percent of rated voltage. In addition these military requirements are verified under a

qualification system. Commercial components are not designed to withstand these military environmental conditions.

6.2 Acquisition requirements. Acquisition documents must specify the following:

a. Title, number, and date of the specification.

b. Packaging requirements (see section 5.1).

c. Direct Governmental purchases should specify machine nuts and washers.