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MIL-PRF-39001 Capacitors, Fixed, Mica Dielectric, Established Reliability And Nonestablished Reliability, General Specification ForThis specification covers the general requirements for established reliability \(ER\) and nonestablished reliability \(non-ER\), mica dielectric, fixed capacitors \(see 6.1\). The ER capacitors have a failure rate level \(FRL\) ranging from 1.0 percent per 1,000 hours to 0.001 percent per 1,000 hours \(see 1.2.1.7\). The FRL is established at a 90 percent confidence level. The FRL, identified by the applicable symbol specified in table V is referred to operational life at full rated voltage \(see 1.2.1.6\) at 125 degrees C or 150 degrees C, as applicable. An acceleration factor of 25:1 has been used to relate the life test at 150 percent of rated voltage at rated temperature to rated voltage at rated temperature.

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MIL-PRF-39001E

TABLE XI. Group C inspection.

Inspection

Requirement

Method

Number of

Allowable

paragraph

sample units

failures

Subgroup 1

Vibration 1/

3.13

4.7.9

Temperature coefficient &

3.14

4.7.10

capacitance drift

Thermal shock and immersion

3.15

4.7.11

Subgroup 2

Shock, specified pulse 1/

Terminal strength 1/

Resistance to soldering heat 1/

Moisture resistance

Subgroup 3

Life (2,000 hours accelerated)

3.20

4.7.16.2

10 2/

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

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

shall perform this test every three years after the deletion as part of long term design verification. If the

design, material, construction or 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/ See 4.6.2.1.1.2.

4.7 Methods of inspection.

4.7.1 Visual and mechanical examination. Capacitors shall be examined to verify that the materials, design,

construction, physical dimensions, marking, and workmanship are in accordance with the applicable requirements

(see 3.1, 3.4 to 3.5.2 inclusive, and 3.23 to 3.24.1, inclusive).

4.7.2 Dielectric withstanding voltage (see 3.6). Capacitors shall be tested in accordance with

method 301 of MIL-STD-202. The following details shall apply:

a. Magnitude and nature of test voltage: 200 percent of rated dc voltage.

b. Duration of application of test voltage: Not less than 1 second nor more than 5 seconds. The duration of the

test shall begin when 95 percent of the test potential is reached.

c. Points of application of test voltage: Between terminals.

d. Limiting value of surge current: Shall not exceed 50 milliamperes (mA) during charging and discharging.

e. Examination after test: Capacitors shall be examined for evidence of damage, arcing, and breakdown.

4.7.3 High voltage stabilization (see 3.7). Capacitors shall be subjected to 200 percent of rated dc voltage at a

minimum temperature of 125C or 150C, as applicable, for a minimum of 48 hours. During the test, the capacitors

shall be adequately protected against voltage surges of 25 percent or more of test voltage and surge current shall

not exceed 50 mA. Capacitors shall be examined for evidence of damage, arcing, and breakdown. Insulation

resistance shall then be measured as specified in 4.7.5.1.

4.7.4 Barometric pressure (see 3.8) (for qualification only). Capacitors shall be tested in accordance with

method 105 of MIL-STD-202. The following details shall apply:

a. Method of mounting: Not applicable.

b. Test condition: D (100,000 feet).