MIL-PRF-20 Capacitor, Fixed, Ceramic Dielectric \(Temperature Compensating\), Established Reliability And Non-Established Reliability, General Specification ForThis specification covers the general requirements for established reliability \(ER\) and non-ER, temperature compensating, fixed capacitors for use primarily where compensation is necessary for circuit applications due to temperature changes, in bypass and coupling applications. Capacitors meeting the ER requirements specified herein have a failure rate level \(FRL\) ranging from 1.0 percent per 1,000 hours to 0.00l percent per 1,000 hours. These failure rate levels are established at a 90-percent confidence level based on the life test parameters specified and are maintained at a 10-percent producer\'s risk. An acceleration factor of 8:1 has been used to relate the life test data at 200 percent of rated voltage at the applicable high test temperature to the rated voltage at the applicable high test temperature. A part per million \(ppm\) quality system is used for documenting and reporting the average outgoing quality of ER capacitors supplied to this specification. Statistical process control \(SPC\) techniques are required in the manufacturing process to minimize variation in production of ER capacitors supplied to the requirements of this specification.

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MIL-PRF-20M

1.2.1.1 Style. The style is identified by either the three-letter symbol "CCR" (ER parts) or by the two-letter symbol

"CC" (non-ER parts) followed by a two-digit number. The letters identify temperature compensating, ceramic

dielectric, fixed capacitors, and the number identifies the shape and dimensions of the capacitor.

1.2.1.2 Characteristic. The characteristic is identified by a two-letter symbol in accordance with table I. The first

letter identifies the nominal temperature coefficient; the second letter identifies the approximate tolerance envelope

for the temperature coefficient (G = 30 ppm/�C; H = 60 ppm/�C; J = 120 ppm/�C; and K = 250 ppm/�C) (see figure 1

and 6.5).

TABLE I. Characteristic.

Symbol

Nominal temperature coefficient

0 �30 ppm/�C

0 �60 ppm/�C

0 �120 ppm/�C

0 �250 ppm/�C

Not practically measurable

1.2.1.3 Capacitance. The nominal capacitance value expressed in picofarads (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" indicates 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 is identified by a single letter in accordance with table II.

TABLE II. Capacitance tolerance.

Symbol

Capacitance tolerance

�0.1 pF

�0.25 pF

�0.5 pF

F 1/

�1 percent

G 1/

�2 percent

�5 percent

�10 percent

1/ For nominal capacitance of 10 pF or

less, the capacitance tolerances are

�1.0 pF (F) and �2.0 pF (G).

1.2.1.5 Product level designator. The product level designation in percent per 1,000 hours is identified by a single

letter in accordance with table III. This is also known as the failure rate level (FRL).

TABLE III. Product level designator.

Product level

Symbol

(percent per 1,000 hours)

1.0

0.1

0.01

0.001