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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 VIII. Qualification inspection.

Number of

Requirement

Method

Number of

defectives

Inspection

paragraph

sample units to

allowed 1/

be inspected

Group I 2/

102

4.7.2

3.6

Dielectric withstanding voltage

4.7.3

3.7

High voltage stabilization

Group II 2/

4.7.1

3.1, 3.4 to 3.5,

Visual and mechanical

3.23 to 3.24.1

examination 3/

4/ 102

Barometric pressure

Insulation resistance

Capacitance

Dissipation factor

Group III

Solderability

Vibration

Temperature coefficient and

capacitance drift

4.7.11

3.15

Thermal shock and immersion

Group IV

4.7.12

3.16

Shock, specified pulse

Terminal strength

Resistance to soldering heat

4.7.15

3.19

Moisture resistance

Group V

4.7.16.1.1

3.20

Life (rated conditions)

4.7.16.1.2

3.20

Life (accelerated conditions)

Group VI

Fungus 5/

Resistance to solvents

1/ A sample unit having one or more defects shall be considered a single defective.

2/ Nondestructive tests.

3/ Marking defects are based on visual examination only and shall be charged only for illegible, incomplete, or

incorrect marking.

4/ Sample units shall be selected from those which have passed group I inspection.

5/ Certification of fungus resistance may be substituted for testing.

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A inspection.

4.6.1.1 Inspection and production lot.

4.6.1.1.1 Inspection lot. An inspection lot shall consist of all capacitors from the same production line or lines, of

the same style, rated voltage, dielectric material, and offered for inspection during a single work month. Each lot

shall be kept separate from every other lot. The sample selected from the lot shall be representative of the

capacitance values and case sizes in the lot. Styles CMR03, CMR04, CMR06, CMR07, and CMR08 may be

combined for FRL maintenance.

4.6.1.1.2 Production lot. A production lot shall consist of all capacitors of the same style, voltage rating,

characteristic, nominal capacitance value, capacitance tolerance, and case size. The manufacturer of all parts in the

lot shall have been started, processed, assembled, and tested as a group. Lot identity shall be maintained

throughout the manufacturing cycle.