MIL-PRF-123 Capacitors, Fixed, Ceramic Dielectric, \(Temperature Stable And General Purpose\), High Reliability, General Specification ForThis specification covers the general requirements for high reliability, general purpose \(BX and BR\) and temperature stable \(BP and BG\) ceramic dielectric fixed capacitors, leaded and nonleaded for space, missile, and other high reliability applications. Capacitors covered by this specification may be used in critical frequency determining applications, timing circuits, and other applications where absolute stability is required \(BP and BG\), and in applications where appreciable variations in capacitance with respect to temperature, voltage, frequency, and life can be tolerated \(BX and BR\). Life tests in this specification are performed at two times rated voltage at maximum rated temperature, and an assumed acceleration factor of 8:1 is used to relate life test data obtained at two times rated voltage to performance at rated voltage.

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MIL-PRF-123D

3.17.2 Solderability (nonleaded capacitors). When nonleaded capacitors are tested as specified in 4.6.13.2, the

immersed metallized surface shall be at least 85 percent covered with a smooth solder coating. The remaining 15

percent of the surface may contain small pinholes or exposed termination material; however, these shall not be

concentrated in one area.

3.18 Resistance to soldering heat.

3.18.1 Resistance to soldering heat (leaded capacitors). When tested as specified in 4.6.14.1, capacitors shall

meet the following requirements:

a. Insulation resistance at +25�C: Not less than the initial +25�C requirement (see 3.14).

b. Capacitance change:

(1) BR and BX characteristics: Shall change not more than -1.0 percent to +6.0 percent from the initial

measured value.

(2) BG and BP characteristics: Shall change not more than -1.0 percent to +2.0 percent or 0.5 pF, whichever

is greater, from the initial measured value.

c. Dissipation factor: Shall not exceed the initial limits (see 3.12).

3.18.2 Resistance to soldering heat (nonleaded capacitors). When tested as specified in 4.6.14.2, capacitors

shall meet the following requirements:

a. Visual examination: There shall be no evidence of mechanical damage or declamation or exposed

electrodes. Leaching shall be a maximum of 25 percent on each edge of mounting area (see figure 2).

b. Insulation resistance, capacitance change, and dissipation factor shall be measured as specified in 3.18.1.

FIGURE 2. Mounting area.

3.19 Voltage-temperature limits. The capacitance change over the range of temperatures specified in 4.6.15 shall

not exceed the limits specified in table V. The capacitance value obtained in step C of table XVIII shall be

considered as the reference point. For BP and BG values below 20 pF, see table VI.

3.20 Moisture resistance. When tested as specified in 4.6.16, capacitors shall meet the following requirements:

a. Visual examination: No mechanical damage. Marking shall remain legible.

b. Dielectric withstanding voltage (moisture resistance, normal voltage only): As specified in 3.13.