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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11

MIL-PRF-87164A

3.5.2 Connections. All electrodes (foils, clips, and leads) used as terminations for the silvered mica conductor

must be mechanically and electrically bonded together. Foils (and solder if used) must have a minimum melting

point of 260�C. Solder, if used, for bonding the lead wires to the clips shall have a minimum melting point of 182�C

and will be of the same alloy as the tin-lead coating on the lead wire.

3.6 Dielectric withstanding voltage. The capacitors shall withstand the direct current (dc) potential specified in

4.7.2 without damage, arcing, or breakdown.

3.7 Barometric pressure. The capacitors shall withstand the dc potential specified in 4.7.3 without damage,

arcing, or breakdown.

3.8 Insulation resistance.

3.8.1 At room ambient temperature. When measured as specified in 4.7.4.1, the insulation resistance shall be

not less than the applicable value specified on figure 1.

3.8.2 At high ambient temperature. When measured as specified in 4.7.4.2, the insulation resistance shall be not

less than the applicable value specified on figure 1.

3.9 Capacitance. When measured as specified in 4.7.5, the capacitance shall be within the tolerance designated

by the PIN (see 3.1).

3.10 Dissipation factor. When measured as specified in 4.7.6, the dissipation factor shall not exceed the

applicable value shown on figure 2.

3.11 High voltage stabilization. When the capacitors are tested as specified in 4.7.7, there shall be no evidence

of damage, arcing, or breakdown; and the insulation resistance shall be not less than the applicable value specified

on figure 1.

3.12 Solderability. When the capacitors are tested as specified in 4.7.8, the dipped surface of the lead shall be at

least 95 percent covered with continuous new solder coating. The remaining 5 percent of the lead surface shall

show only small pinholes or voids. These shall not be concentrated in one area. No individual view of the dipped

surface shall show less than 95 percent coverage. Bare base metal and areas where the solder dip failed to cover

the original coating are indications of poor solderability, and shall be cause for failure. In case of dispute, the

percent of coverage with pinholes or voids shall be determined by actual measurement of these areas, as compared

to the total area.

3.13 Vibration, high frequency. When the capacitors are tested as specified in 4.7.9, there shall be no intermittent

contacts of 0.5 milliseconds (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.

3.14 Temperature coefficient and capacitance drift. When measured as specified in 4.7.10, the temperature

coefficient and capacitance drift shall be within the limits specified in table I for the characteristic listed (see 3.1).