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.

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MIL-PRF-11693E

d. Dissipation factor: Shall not exceed 1.5 percent.

e. 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.

3.20 Solderability. When capacitors are tested as specified in 4.7.16, the dipped surface of the capacitor leads

shall be at least 95 percent covered with a new continuous solder coating, free from pinholes or voids. The remaining

5 percent of the lead surface shall show only small pinholes or voids. These shall not be concentrated in one area.

Bare base material and areas where the solder dip failed to cover the original coating are indications of poor

solderability and shall be cause for failure. In case of dispute, the percentage covered by pinholes or voids shall be

determined by actual measurement of those areas, as compared to the total area.

3.21 Resistance to solvents. When capacitors are tested as specified in 4.7.17, there shall be no evidence of

mechanical damage, and the marking shall remain legible.

3.22 Low temperature and capacitance change at reduced temperature. When capacitors are tested as specified

in 4.7.18, there shall be no evidence of breakdown, flashover, or fracture. The capacitance change at -55� �3�C shall

not exceed 15 percent of the value measured at +25�C.

3.23 Life. When tested as specified in 4.7.19, there shall be no mechanical failure or leakage of impregnant or

filling compound and capacitors shall meet the following requirements:

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

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

measured as specified in 4.7.6.

c. Dissipation factor: Shall not exceed 1.5 percent.

d. Insertion loss: Unless otherwise specified (see 3.1), 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.

3.24 Flashpoint of impregnant or filling compound. When measured as specified in 4.7.20, the flashpoint of the

impregnant or filling compound shall be not lower than +145�C for characteristic K, and +135�C for characteristics E.

3.25 Marking. Capacitors shall be marked with the PIN, "JAN" marking when applicable (see 3.25.2), trade

mark , Commercial and Government Entity (CAGE) code, date code, and voltage and current ratings. The marking

shall be placed on the exposed cylindrical surface of the case and shall remain legible after all environmental tests.

Labels shall not be used. Other markings that in any way interfere with, obscure, or confuse those specified herein

are prohibited. There shall be no space between the symbols that comprise the type designation. If space limitation

requires it, the type designation may appear on two lines. In this event, the type designation shall be divided between

the current symbol and the characteristic symbol as shown in the following examples:

CZ23B

CZR23B

KB473

KB473M

JAN

12345

CAGE code

0411

Date code

100 Volt

20 Amps

NOTE: The trademark may appear anyplace on the capacitor. Successful qualification is a prerequisite for "JAN"

branding.