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

c. Test condition E (50's): Except frequency range of 10 through 3,000 Hz.

d. Duration and direction of motion: Equal amounts of time in each of three mutually perpendicular planes (total

of 8 hours).

e. Measurements during vibration: During the last cycle in each direction, an electrical measurement shall be

made to determine intermittent contacts of 0.5 ms or greater duration, or open- or short-circuiting.

f. Examination after vibration: Capacitors shall be visually examined for evidence of mechanical damage.

4.6.18 Resistance to solvents (see 3.22). Capacitors shall be tested in accordance with method 215 of

MIL-STD-202. The following details shall apply:

a. The marked portion of the capacitor body shall be brushed.

b. The number of sample units to be examined shall be as specified in table IX.

c. Capacitors shall be visually examined for evidence of mechanical damage and obliteration of marking.

4.6.19 Life (at elevated ambient temperature) (see 3.23). Capacitors shall be tested in accordance with method

108 of MIL-STD-202. The following details and exceptions shall apply:

a. Minimum sample size and accept/reject criteria shall be in accordance with table XIX.

b. Distance of temperature measurements from specimens, in inches, not applicable.

c. Test temperature and tolerance: +125�C, +4�C, -0�C.

d. Capacitors shall be subjected to the voltage and circuit specified in 4.6.6.2.1. In the event of a fuse failure,

the procedure specified in 4.6.6.2.1 shall apply.

e. Test duration: 4,000 hours for qualification and 1,000 hours for group B.

f. Measurements during and after exposure: At the conclusion of 250, 1,000, 2,000, and 4,000 hours, and

while the capacitors are at the applicable high-test temperature, the insulation resistance shall be measured

as specified in 4.6.10. At the option of the manufacturer, the units may be immediately transferred (period of

transfer not to exceed 15 minutes) to another chamber maintained at the same temperature for the purpose

of measuring insulation resistance. The insulation resistance measurement shall be made only after the

units have stabilized at the test temperature. The capacitors shall then be returned to the inspection

conditions specified in 4.3 and shall be visually examined for evidence of mechanical damage and

obliteration of marking; capacitance, dissipation factor, and insulation resistance shall be measured as

specified in 4.6.7, 4.6.8, and 4.6.10, respectively.

TABLE XIX. Life test.

250 - 4,000 hours

Lot size

Minimum sample size

Reject

1 - 1,200

1,201 - 10,000

10,001 - 150,000

125