MIL-PRF-39001 Capacitors, Fixed, Mica Dielectric, Established Reliability And Nonestablished Reliability, General Specification ForThis specification covers the general requirements for established reliability \(ER\) and nonestablished reliability \(non-ER\), mica dielectric, fixed capacitors \(see 6.1\). The ER capacitors have a failure rate level \(FRL\) ranging from 1.0 percent per 1,000 hours to 0.001 percent per 1,000 hours \(see 1.2.1.7\). The FRL is established at a 90 percent confidence level. The FRL, identified by the applicable symbol specified in table V is referred to operational life at full rated voltage \(see 1.2.1.6\) at 125 degrees C or 150 degrees C, as applicable. An acceleration factor of 25:1 has been used to relate the life test at 150 percent of rated voltage at rated temperature to rated voltage at rated temperature.

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MIL-PRF-39001E

TABLE I. Characteristic.

Symbol

Temperature coefficient

Capacitance drift

Parts/million/C (ppm/�C)

-200 to +200

� (0.5 percent + 0.1 picofarad (pF))

-20 to +100

� (0.1 percent + 0.1 pF)

-0 to +70

� (0.05 percent + 0.1 pF)

1.2.1.3 Capacitance. The nominal capacitance value expressed in pF is identified by a three-digit number; the

first two digits represent significant figures and the last digit specifies the number of zeros to follow. When the

nominal value is less than 10 pF, the letter R is used to indicate the decimal point and the succeeding digit(s) of the

group represent significant figure(s). For example 1R0 indicates 1.0 pF; R75 indicates 0.75 pF; and 0R5 indicates

0.5 pF.

1.2.1.4 Capacitance tolerance. The capacitance tolerance in percent or pF, as applicable, is identified by a single

letter in accordance with table II.

TABLE II. Capacitance tolerance.

Symbol

Capacitance tolerance

�0.5 pF

�1 percent

�2 percent

�5 percent

1.2.1.5 Operating temperature range. The operating temperature range is identified by a single letter in

accordance with table III.

TABLE III. Operating temperature range.

Operating temperature range, C

Symbol

-55 to +125

-55 to +150

1.2.1.6 Rated voltage. The rated voltage is identified by a single letter in accordance with table IV.

TABLE IV. Rated voltage.

Symbol

DC rated voltage, volts

100

300

500

1.2.1.7 Product level designator. The FRL in percent per 1,000 hours is identified by a single letter in accordance

with table V and is based on rated voltage at 125C or 150C, as applicable.

TABLE V. Product level designator.

Symbol

Product level designator

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1.0 percent per 1,000 hours

0.1 percent per 1,000 hours

0.01 percent per 1,000 hours

0.001 percent per 1,000 hours