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

6.7 Subject term (key word) listing.

Capacitance

Microstrip

Stripline

6.8 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin

whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture

and can develop under typical operating conditions, on products that use such materials. Conformal coatings applied

over top of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass,

have shown to inhibit the growth of tin whiskers. For additional information on this matter, refer to ASTM-B545

(Standard Specification for Electrodeposited Coatings of Tin).

6.9 Environmentally preferable material. Environmentally preferable material. Environmentally preferable

materials should be used to the maximum extent possible to meet the requirements of this specification. As of the

dating of this document, the U.S. Environmental Protection Agency (EPA) is focusing efforts on reducing 31 priority

chemicals. The list of chemicals and additional information is available on their website at

https://www.epa.gov/osw/hazard/wastemin/priority.htm. Included in the EPA list of 31 priority chemicals are cadmium,

lead, and mercury. Use of these materials should be minimized or eliminated unless needed to meet the

requirements specified herein (see Section 3)."

6.10 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate

where changes from the previous issue were made. This was done as a convenience only and the Government

assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to

evaluate the requirements of this document based on the entire content irrespective of the marginal notations and

relationship to the last previous issue.