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

3.21 Marking. Capacitors shall be marked in accordance with method I of MIL-STD-1285. Polarity for polarized

units shall be indicated by a plus (+) symbol near the positive terminal. At the option of the manufacturer, a

contrasting color may also be used to indicate polarity. Paper labels shall not be used. Marking shall remain legible

after all tests. Capacitor marking shall include the specified information, in the sequence shown in the following

example.

105K - Coded capacitance (in picofarads); capacitance tolerance.

+50T - Polarity, voltage, and manufacturers trade mark. 1/

1412A � Date code and lot symbol 2/

1/ Polarity symbol shall be near the positive terminal and may be placed on either end of the last line of type,

depending on the marking orientation with respect to the polarity.

2/ Date code and lot symbol marking are at the option of the manufacturer.

3.22 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered,

environmentally preferable, or biobased materials should be used to the maximum extent possible, provided that the

material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous

life cycle costs.

3.23 Workmanship. Capacitors shall be processed in such a manner that when examined under 3X magnification,

they shall be uniform in quality and shall be free from pits, cracks, rough edges, and other defects that will affect life,

serviceability, or appearance.

3.23.1 Soldering. All excess flux or solder shall be removed. Electrical connections shall be electrically

continuous after soldering.

4. VERIFICATION

4.1 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient

accuracy, quality and quantity to permit performance of required inspection shall be established and maintained by

the contractor. The establishment and maintenance of a calibration system to control the accuracy of the measuring

and test equipment shall be in accordance with ISO/IEC 17025, ISO 10012 or approved equivalent.

4.2 Classification of inspections. The inspection requirements specified herein are classified as follows:

a. Qualification inspection (see 4.4).

b. Verification of qualification (see 4.5).

c. Conformance inspection (see 4.6).

d. Periodic group C inspection (see 4.7).

4.3 Inspection conditions.

4.3.1 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accordance

with the test conditions specified in the "GENERAL REQUIREMENTS" of MIL-STD-202.

4.3.2 AC measurements. AC measurements shall be made at the frequency specified. The magnitude of the ac

voltage shall be equal to or less than 1.0 volt root mean square (rms). The maximum dc bias voltage shall be equal

to or less than 2.2 volts for all ac measurements of polarized capacitors.

4.3.3 Reference measurements. When requirements are based on comparative measurements made before and

after conditioning, the reference measurement shall be considered the last measurement made at +25�C �5�C prior

to conditioning. Unless reference measurements have been made within 30 days prior to the beginning of

conditioning, they shall be repeated.