MIL-PRF-49464 Capacitors, Chip, Single Layer, Fixed, Parallel Plate, Ceramic Dielectric, Established Reliability, General Specification ForThis specification covers the general requirements for ceramic plate, single layer capacitors. These capacitors are intended for stripline or microstrip applications, usually at frequencies of 1 GHz and higher. Capacitors covered by this specification have failure rate levels \(FRL\) ranging from 1.0 to 0.001 percent per 1,000 hours. These failure rate levels are established at a 90-percent confidence level and maintained at a 10-percent producer\'s risk. They are based on life tests performed at a maximum rated voltage at maximum rated temperature. An acceleration factor of 8:1 has been used to relate life test data obtained at 200 percent of rated voltage at maximum rated temperature, to rated voltage at rated temperature. Statistical Process Control \(SPC\) techniques are required in the manufacturing process to minimize variation in production of capacitors supplied to the requirements of this specification.

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MIL-PRF-49464C

TABLE I. Temperature coefficient limits.

Capacitance change with

Symbol

Class

temperature

0 �25 ppm/�C

0 �30 ppm/�C

�20 percent

1.2.1.2 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" 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 and 0R5 indicates 0.5 pF.

1.2.1.3 Capacitance tolerance. The capacitance tolerance is identified by a single letter in accordance with table II.

TABLE II. Capacitance tolerance.

Symbol

Capacitance tolerance

� .05 pF

� .10 pF

� .25 pF

� .50 pF

�5 percent

�10 percent

�20 percent

1.2.1.4 Rated voltage. The rated voltage for continuous operation at +125�C is identified by a single letter as

shown in table III.

TABLE III. Rated voltage.

Symbol

Rated voltage

100

1.2.1.5 Case code. The case code is identified by a single letter (see 3.1).

1.2.1.6 Termination configuration code. There are three termination configurations available (see 3.1):

A - Borders on top and bottom,

B - Border on top and full metallization on bottom, and

C - Full metallization on top and bottom.