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MIL-PRF-87164 Capacitors, Fixed, Mica Dielectric, High Reliability, General Specification For \(See Notice 1 For Replacement Information\)This specification covers the general requirements for high reliability, mica dielectric, fixed capacitors for space, missile, and other high reliability applications. Capacitors covered by this specification may be used in critical applications where the utmost in stability and dependability is required and where variations in capacitance with respect to temperature, voltage, frequency, and life cannot be tolerated \(see 6.1\). An acceleration factor of 25:1 has been used to relate life test data obtained at 150 percent of rated voltage at rated temperature to rated voltage at rated temperature.

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MIL-PRF-87164A
3.15 Thermal shock and immersion. When tested as specified in 4.7.11, the capacitors shall meet the following
requirements:
Dielectric withstanding voltage:
As specified in 3.6.
Insulation resistance:
Shall be not less than 30 percent of initial requirement (see 3.8).
Capacitance:
The capacitance change shall not exceed 1 percent or 1 pF, whichever is
greater, from the reference measurement (see 4.3.2.1).
Dissipation factor:
Shall not exceed 150 percent of the initial requirement specified in 3.10.
Visual examination:
No visible evidence of deterioration, permanent damage to leads or case, nor
corrosion on leads.
3.16 Shock, specified pulse. When the 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 the 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 as a failure.
3.18 Moisture resistance. When tested as specified in 4.7.14, capacitors shall meet the following requirements:
Dielectric withstanding voltage:
As specified in 3.6.
Insulation resistance:
Shall be not less than 25 percent of initial requirement (see 3.8).
Capacitance:
The capacitance change shall not exceed 1 percent or 1 pF, whichever is
greater, from the reference measurement (see 4.7.2.1).
Dissipation factor:
Shall not exceed 150 percent of the initial requirement specified in 3.10.
Visual examination:
No visible evidence of deterioration, permanent damage to leads or case, nor
corrosion on leads.
3.19 Life. When tested as specified in 4.7.15, capacitors shall meet the following requirements:
Dielectric withstanding voltage:
As specified in 3.6.
Insulation resistance:
Shall be not less than the applicable value specified on figure 1.
Capacitance:
The capacitance change shall not exceed ±1 percent or ±1 pF, whichever is
greater, from the initial measurement.
Dissipation factor:
Shall not exceed 150 percent of the initial requirement specified in 3.10.
Visual examination:
No visible evidence of deterioration, permanent damage to leads or case,
arcing, or breakdown.
3.20 Fungus. The manufacturer shall certify that all external materials are fungus resistant or shall perform the
test specified in 4.7.16. When the capacitors are tested as specified in 4.7.16, examination shall disclose no
evidence of fungus growth on the external surface of the capacitor.
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