MIL-PRF-15733J
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products which are
at the time set for opening of bids, qualified for inclusion in the applicable 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 Defense Supply
Center Columbus (DSCC-VQP), Post Office Box 3990, Columbus, OH 43218-3990 or by E-mail at
vqp.chief@dla.mil. An online listing of products qualified to this specification may be found in the Qualified Products
Database (QPD) at https://assist.daps.mil.
6.4 Solder coating. It is intended that solder coatings on terminals withstand extended storage without
deterioration of soldering qualities or appreciable increase in resistance.
6.5 Tin whisker growth. Pure tin plating is prohibited (see 3.3.2 and 3.4.3) since it may result in tin whisker growth.
The use of alloys with tin content greater than 97 percent 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. Tin whisker growth could adversely affect the operation of electronic equipment systems. For additional
information on this matter, refer to ASTM-B545 (Standard Specification for Electrodeposited Coating of Tin).
6.6 Environmentally preferable material. Environmentally preferable materials should be used to the maximum
extent possible to meet the requirements of this specification. As of the date 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 at https://www.epa.gov/osw/hazard/wastemin/priority.htm.
6.7 Previous classification information. This information is provided to maintain a cross-reference to the former
classification coding system.
6.7.1 Type designation. The type designation shall be in the following form and as specified :
FL22
D
D
1E
A
1
Style
Current
Insertion-loss
Terminal
Operating
Grade
(6.7.1.1)
rating
characteristic
identification
temperature
(6.7.1.6)
(6.7.1.2)
(6.7.1.3)
(6.7.1.4)
range
(6.7.1.5)
6.7.1.1 Style. The style is identified by the two-letter symbol "FL" followed by a two digit number. The letters
identify radio frequency interference filters; the digits identify the general shape and mounting of the case.
6.7.1.2 Current rating. The current rating, at maximum operating temperature; is identified by a single letter, in
accordance with table X.
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