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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. Insulation resistance: Humidity, steady state, 1.3 �0.25 volts - Shall meet the initial +25�C requirement

specified in 3.14. Moisture resistance, normal voltage - not less than 50 percent of the initial +25�C

requirement specified in 3.14.

d. Capacitance: Change not to exceed �10 percent from initial measured value for BX and BR characteristics,

and not more than �.3 percent or .3 pF, whichever is greater, for BP and BG characteristics.

TABLE V. Capacitance change with reference to +25�C.

Steps E through G

Steps A through D

of table XVIII

Characteristic

Bias = 0 volt

Bias = rated voltage

�15 percent

+15, -40 percent

�15 percent

+15, -25 percent

0 �30 ppm/�C

BP 1/

90 �20 ppm/�C

BG 1/

1/ At the +25�C stability point, the capacitance measurement may be � .2

percent or -0.05 pF, whichever is greater, from the +25�C reference.

TABLE VI. Temperature coefficient tolerances for characteristics BP

and BG values below 20 pF.

Permissible capacitance change from capacitance at +25�C in ppm/�C

Temperature

Less than 2.1 pF

2.15 pF to 4.2 pF

4.3 pF to 8.0 pF

8.1 pF to 18 pF

Greater than 18 pF

+125�C

�250 ppm/�C

�120 ppm/�C

�60 ppm/�C

�30 ppm/�C

-55�C 2/

+246.25

+116.25

+55.00

+27.50

-326.25

-166.25

-91.25

-53.75

1/ Not practically measurable.

2/ The ppm/�C values for -55�C were calculated by dividing ppm by -80�C.

3.21 Vibration, high frequency (leaded capacitors only). When capacitors are tested as specified in 4.6.17, there

shall be no intermittent contacts of 0.5 millisecond (ms) or greater duration, open or short circuitry, or evidence of

mechanical damage.

3.22 Resistance to solvents. When capacitors are tested as specified in 4.6.18, there shall be no evidence of

mechanical damage and the marking shall remain legible.

3.23 Life (at elevated ambient temperature). When tested as specified in 4.6.19, capacitors shall meet the

following requirements:

a. 250-hour limits:

(1) Insulation resistance (at +125�C): Shall not be less than 50 percent of the value specified (see 3.14).

(2) Visual examination: No mechanical damage. Marking shall remain legible.

(3) Insulation resistance (at +25�C): Shall not be less than 50 percent of the value specified (see 3.14).