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

FIGURE 2. Capacitance value versus DF.

3.16 Shock, specified pulse. When capacitors are tested as specified in 4.7.12, there shall be no intermittent

contacts of 0.5 ms or greater duration, or momentary arcing, or other indication of breakdown, nor shall there be any

open-circuiting or short-circuiting or evidence of mechanical damage.

3.17 Terminal strength. When capacitors are tested as specified in 4.7.13, the terminals shall not loosen or

rupture and no other damage shall result. Chipping of the resinous coating on the leads, in the "R" dimension area

only (see 3.1), shall not be considered a failure.

3.18 Resistance to soldering heat. When tested as specified in 4.7.14, capacitors shall meet the following

requirements:

a. IR: Shall not be less than the initial requirement (see 3.9).

b. Cap: The capacitance change shall not exceed �5 percent or �5 pF, whichever is greater, from the initial

measurement.

c. DF: Shall not exceed initial requirement.

3.19 Moisture resistance. When tested as specified in 4.7.15, capacitors shall meet the following requirements:

a. DWV: As specified in 3.6.

b. IR: Shall be not less than 25 percent of the initial requirement (see 3.9).

c. Cap: The capacitance change shall not exceed 1 percent or 1 pF, whichever is greater, from the reference

measurement (see 4.3.2.1).

d. DF: Shall not exceed 150 percent of the initial requirement specified in 3.11.

e. Visual examination: No visible evidence of deterioration, permanent damage to the leads or case, nor

corrosion on the leads.