MIL-PRF-49137 Capacitors, Fixed, Electrolytic \(Solid Electrolyte\), Tantalum, Molded, Conformal Coated And Metal Cased With Plastic End-Fill, Nonhermetically Sealed, General Specification ForThis specification covers the general requirements for fixed, electrolytic \(solid electrolyte\), tantalum, molded, conformal coated and metal cased with plastic end-fill nonhermetically sealed capacitors, primarily intended for filter, bypass, coupling, and other applications where the alternating current \(ac\) component is small compared to the direct current \(dc\) rated voltage. These capacitors are intended to be used only where supplemental moisture protection is provided or for noncritical applications where hermetic moisture protection is not required.

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MIL-PRF-49137E

4.3.4 Power supply. The power supply used for life testing shall have a regulation of �2 percent or less of the

rated voltage. The power source employed for dc leakage current measurements shall be stabilized to at least �100

parts per million. During measurements, there must be no voltage fluctuations of sufficient amplitude to produce a

variation in the current measurement as read with any dc leakage current tester used to test capacitors.

4.4 Qualification inspection. Qualification inspection shall he performed at a laboratory acceptable to the

Government (see 6.4) on sample units produced with equipment and procedures normally used in production.

4.4.1 Sample size. The number and style combinations of capacitors to be subjected to qualification inspection

shall be as specified in appendix A.

4.4.2 Inspection routine. The sample units shall be subjected to the inspections specified in table III, in the order

shown.

4.4.3 Failures. Failures in excess of those allowed in table III shall be cause for refusal to grant qualification

approval.

4.5 Verification of qualification. The manufacturer shall provide verification to the qualifying activity. Continuation

of qualification shall be based on meeting the following requirements:

a. The capacitor design has not been modified.

b. Lot rejection for group A inspection does not exceed 10 percent or one lot, whichever is greater.

c. Periodic group C inspection.

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and group B

inspections.

4.6.1.1 Inspection lot. An inspection lot shall consist of all capacitors of the same style (see 3.1), produced under

essentially the same conditions with the same basic materials, and offered for inspection during a single month. The

capacitance values and voltages produced shall be represented in the lot in approximately the ratio of production.

Voltage groups shall be as follows:

I - - - - - - - - - - - - - - - - - - - 6 through 20 volts.

II - - - - - - - - - - - - - - - - - - - 25 through 50 volts.