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

e. Measurements during vibration: During the last cycle, an electrical measurement shall be made to determine

intermittent operation or open-circuiting or short-circuiting. Observations shall also be made to determine

intermittent contact or arcing or open-circuiting or short-circuiting. Detecting equipment shall be sufficiently

sensitive to detect any interruption with a duration of 0.5 ms or greater.

f. Measurements after vibration: Not applicable.

g. Examination after test: Capacitors shall be visually examined for evidence of mechanical damage.

4.8.9 Thermal shock (see 3.12). Capacitors shall be tested in accordance with method 107 of MIL-STD-202. The

following details and exceptions shall apply:

a. Test condition letter A.

b. Measurements after thermal shock: DC leakage, capacitance, and dissipation factor shall be measured as

specified in 4.8.4, 4.8.5, and 4.8.6, respectively.

c. Examination after test: Capacitors shall be visually examined for evidence of harmful corrosion, mechanical

damage, and obliteration of marking (wherever applicable).

4.8.10 Resistance to soldering heat (see 3.13). Capacitors shall be tested in accordance with method 210 of MIL-

STD-202. The following details and exceptions shall apply:

a. Test condition letter B: Leads shall be immersed to within .025 inch (0.64 mm) of the end seal or capacitor

body.

b. Cooling time prior to final examinations and measurements after test: Not applicable.

c. Examination after test: Capacitors shall be visually examined for evidence of mechanical damage.

4.8.11 Terminal strength (see 3.14). Capacitors shall be tested in accordance with method 211 of MIL-STD-202.

Unless otherwise specified (see 3.1), the following details shall apply:

a. Test condition letter A: The body of the capacitor shall be secured; 2-pound applied force.

b. Test condition letter C: One pound applied force, three bends.

c. Measurements after test: After the test, capacitors shall be visually examined for loosening of the terminals

and permanent damage to the terminals.

4.8.12 Moisture resistance (see 3.15). Capacitors shall be tested in accordance with method 106 of MIL-STD-202.

The following details and exceptions shall apply:

a. Mounting: Special mounting not required.

b. Initial measurements: Capacitance as specified in 4.8.5.

c. Number of cycles: Ten continuous cycles except steps 7a and 7b are not required.

d. Loading voltage: Not applicable.

e. Final measurements: After removal from chamber, capacitors shall be dried for 1 hour at room temperature.

Within 2 hours to 6 hours after the drying period, dc leakage, capacitance, and dissipation factor shall be

measured as specified in 4.8.4, 4.8.5, and 4.8.6, respectively.

f. Examination after test: Capacitors shall be visually examined for evidence of harmful corrosion, mechanical

damage, and obliteration of marking (wherever applicable).