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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

4.6.2.1.3 Subgroup 6 (ER parts only). Six sample units shall be selected from lots produced during a 6-month

period. Allowable failures shall be as specified in table IX. The accumulated life test data shall be used for

maintenance of FR qualification, and shall be verified for failure rate level maintenance with 90 percent confidence

level, at 2-year intervals.

4.6.2.2 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be

delivered on the contract or order.

TABLE IX. Group B inspection.

Number of defects

Number of

permitted

Requirement

Method

sample

Inspection

paragraph

units to be

NON-ER

inspected

Subgroup 1

Terminal strength 1/

Insertion loss

Subgroup 2

Resistance to soldering heat 1/

3.14

4.7.10

Salt atmosphere (corrosion) 1/

3.15

4.7.11

Thermal shock and immersion 1/

3.16

4.7.12

Subgroup 3

Shock (specified pulse) 2/

3.17

4.7.13

Vibration (high frequency) 2/

3.18

4.7.14

Moisture resistance 1/

3.19

4.7.15

Subgroup 4 3/

Solderability

3.20

4.7.16

Resistance to solvents 1/

3.21

4.7.17

Subgroup 5 (NON-ER parts only)

Low temperature and capacitance

change at reduced temperature

3.22

4.7.18

N/A

Insulation resistance (at the high

3.9

4.7.5

ambient temperature)

Life (240 hours)

3.23

4.7.19.2.1

Subgroup 6 (ER parts only)

Low temperature and capacitance

change at reduced temperature

3.22

4.7.18

1 4/

Insulation resistance (at the high

N/A

ambient temperature)

Life (2,000 hours)

1/ If the manufacturer can demonstrate that this test has been performed five consecutive times with zero failure,

this test, with the approval of the qualifying activity, can be deleted. The manufacturer, however, shall perform

this test every 3 years after the deletion as part of long term design verification. If the design, material,

construction processing of the part is changed, or if there are any quality problems, the qualifying activity may

require resumption of the specified testing. Deletion of testing does not relieve the manufacturer from meeting

the test requirements in case of dispute.

2/ The time requirement for shock and vibration tests is a minimum of once every 24 months.

3/ Two capacitors with sleeve and one unsleeved.

4/ The number of defects is also governed by the requirement of 4.5, wherein the qualified product must meet the

90 percent failure rate plan on an annual basis.