MIL-PRF-14409J
2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the
text of this document and the references cited herein, the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with
the applicable specification sheets. In the event of any conflict between requirements of this specification and the
specification sheets, the latter shall govern (see 6.1).
3.2 Qualification. Capacitors furnished under this specification shall be products that are authorized by the
qualifying activity for listing on the applicable qualified products list before contract award (see 4.3 and 6.2).
3.3 Material. The material shall be as specified herein. However, when a definite material is not specified, a
material shall be used which will enable the capacitors to meet the performance requirements of this specification.
Acceptance or approval of any constituent material shall not be construed as a guaranty of the acceptance of the
finished product.
3.3.1 Pure tin prohibition. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.5).
3.4 Design and construction. Capacitors shall be of the design, construction, and physical dimensions specified
(see 3.1).
3.4.1 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28, and shall be as specified
(see 3.1).
3.4.2 Locking of screw-thread assemblies. All screw-thread mounting assemblies shall be rendered resistant to
loosening under vibration. If needed, lockwashers and nuts compatible with assembly finish, shall be provided.
3.4.3 Terminals. All terminals shall be coated, electro-tin plated, or hot tin dipped with a solder having a minimum
tin content of 40 percent (pure tin is prohibited (see 3.3.1)) or shall be gold plated.
3.4.4 Connections. Electrical connections shall not depend upon wires, lugs, terminals, and the like clamped
between a metallic member and an insulating material. Such connections shall be soldered.
3.5 Thermal shock. When capacitors are tested as specified in 4.5.1, there shall be no evidence of fracture or
loosening of mechanical connections. In addition, corrosion of exposed metallic surfaces shall not exceed 10
percent. (Discoloration and tarnishing alone shall not be cause for rejection.)
3.6 Capacitance. When measured as specified in 4.5.3, the minimum capacitance shall be not more and the
maximum not less than the value specified (see 3.1). The capacitance range may be broader than that specified,
provided it encompasses the specified range.
3.7 Change of capacitance. When capacitors are tested as specified in 4.5.4, the rate of change of capacitance
as a function of the change of adjustment shall not change sign over the entire range of adjustment.
3.8 Insulation resistance. When capacitors are tested as specified in 4.5.5, the insulation resistance shall be not
less than the value specified (see 3.1).
3.9 Dielectric withstanding voltage. When capacitors are tested as specified in 4.5.6, there shall be no evidence
of damage, arcing, or breakdown.
3.10 Quality factor (Q). When capacitors are tested as specified in 4.5.7, the Q shall exceed the value specified
(see 3.1).
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