MIL-PRF-81F
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Capacitors covered by this specification are not intended for circuits where periodic adjustment
is objectionable. Capacitors covered by this specification are unique due to the fact that these devices must be able
to operate satisfactorily in high reliability military systems under the following demanding conditions: 15Gs of high
frequency vibration, 100Gs of shock (specified pulse), and wide temperature fluctuations. These capacitors also offer
very high reliability that is verified under a qualification system. Commercial components are not designed to
withstand these military environmental conditions.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a.
Title, number, and date of the specification, applicable specification sheet, and the complete type designation
(see 1.2.1 and 3.1).
Packaging requirements (see 5.1).
b.
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products that are,
at the time of award of contract, qualified for inclusion in Qualified Products List whether or not such products have
actually been so listed by that date. The attention of the contractors is called to these requirements, and
manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government
tested for qualification in order that they may be eligible to be awarded contracts or orders for the products covered
by this specification. Information pertaining to qualification of products may be obtained from the DLA Land and
Maritime, ATTN: VQP, PO Box 3990, Columbus, OH 43218-3990, or by email to vqp.chief@dla.mil.
6.4 Mounting. It is recommended that a resilient spacer between the unit and mounting surface be used to avoid
possible cracking or chipping of the ceramic mounting base.
6.5 Identification of maximum capacitance. For style CV11, the approximate maximum capacitance value is
obtained by rotating the plated area of the disk (rotor) until it coincides as nearly as possible with the area of the
solder button terminal of the stator.
6.6 Subject term (key word) listing.
Capacitance
Dissipation factor
6.7 Tin whisker growth. The use of alloys with a 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). (see 3.4.1)
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