MIL-PRF-39001E
6.6 FRL determination. The curves presented on figure 3 and figure 4 are the best engineering approximation of
the reliability characteristics (random failures) for these capacitors when employed repeatedly, within their
specification ratings, in complex electronic equipment. These reliability characteristics are based on ground-level
severity experience. Failures are considered to be opens, shorts, or radical departures from initial characteristics.
The failures are considered to be occurring in an unpredictable manner and in too short a period of time to permit
detection through normal preventive maintenance. The curves shown on this figure are based on catastrophic
failures and will differ from the FR established in the specification, since the established FR are based on parameter
failures over long term life tests at rated conditions. Figure 3 and figure 4 have been extracted from MIL-HDBK-217,
"Reliability Stress and Failure Rate Data for Electronic Equipment." The curves have been modified from their
original versions in that the ordinate has been normalized in order to provide multiplier factors in place of discrete
FRLs and in order that the multiplying factor for a FR at rated conditions is unity. As indicated, these curves are the
best estimates based on catastrophic failures; however, they can provide an estimate of the relative effect of
operating under conditions other than rated.
6.7 Subject term (key word) listing.
Capacitance
6.8 Tin plated finishes. Tin plating is prohibited (see 3.5.1) because it may result in tin whisker growth. Tin
whisker growth could adversely affect the operation of electronic equipment systems. For additional information, see
ASTM B545, "Standard Specification for Electrodeposited Coating of Tin."
6.9 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
is available on their website https://www.epa.gov/osw/hazard/wastemin/priority.htm. Included in the EPA llist of 31
priority chemicals are cadmium, lead, and mercury. Use of these materials on the list 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 asterisks 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.
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