MIL-PRF-55365 Capacitor, Fixed, Electrolytic \(Tantalum\), Chip, Established Reliability, Nonestablished Reliability, And High Reliability, General Specification ForThis specification covers the general requirements for non-established reliability \(non-ER\), established reliability \(ER\), and high reliability tantalum dielectric, fixed chip capacitors, primarily intended for use in thick and thin film hybrid circuits or surface mount applications for filter, bypass, coupling, and other applications where the alternating current \(ac\) component is small compared to the direct current \(dc\) rated voltage and where supplemental moisture protection is available \(see 6.1\). The established reliability capacitors have reliability ratings established on the basis of life tests performed at specified voltage at +85??C for failure rate levels \(FRL\) ranging from: a. 1.0 percent per 1,000 hours to 0.001 percent per 1,000 hours in accordance with MIL-STD-690. These FRL?╞s are established at a 60-percent confidence level and are maintained at a 10-percent producer?╞s risk \(exponential distribution\). b. 0.1 percent per 1,000 hours to 0.001 percent per 1,000 hours or 1 FIT \(FIT = failure unit = one failure per 109 device hours\) at 90-percent confidence level \(Weibull distribution\).

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MIL-PRF-55365H

APPENDIX A

A.3.1.3 Combined-voltage submission (Weibull). Three hundred sample units of the highest capacitance value of

the lowest voltage and 300 sample units of the highest capacitance value of the highest voltage in each voltage group

for each style for which qualification is sought shall be submitted (see table A-I). Weibull FRL grading shall be

performed in accordance with 3.23 and 4.7.20 instead of voltage aging (exponential only) in group I of table VI. DC

leakage, capacitance, dissipation factor, and ESR (when specified, see 3.1) shall be performed only once. All other

exponential tests in table VI shall not apply.

A.3.1.4 Styles CWR09, CWR19 and CWR29. Qualifying to CWR29 will extend qualification to styles CWR09 and

CWR19.

A.4 EXTENT OF QUALIFICATION

A.4.1 Single-style submission. Capacitance-range qualification will be restricted to values equal to or less than the

capacitance value submitted. Capacitance-tolerance qualification will be restricted to tolerances equal to and wider

than the tolerance submitted. Voltage rating qualification shall be restricted to those submitted.

A.4.2 Combined voltage submission. Capacitance range qualification will be restricted to values equal to or less

than the capacitance value submitted. Capacitance tolerance qualification will be restricted to tolerances equal to

and wider than the tolerance submitted. Voltage rating qualification shall be restricted to those submitted.

A.4.3 Weibull qualification via similarity. Capacitance range qualification will be restricted to values equal to or

less than the capacitance value submitted. Capacitance tolerance qualification will be restricted to tolerances equal

to and wider than the tolerance submitted. Voltage rating qualification shall be restricted to those submitted.

A.4.4 Non-ER capacitors (A level). Qualification of the A (non-ER) level is predicated upon meeting the

qualification requirements for the established reliability FRL B.

NOTE: Since the non-ER (A level) is the ER design without the mandatory conformance inspection and FRL

assessment, the product is still expected to meet the environmental qualification type requirements (e.g., moisture

resistance, or thermal shock.).

NOTE: "T" level qualification requires that the manufacturer is qualified to weibull grade C or D of equivalent part.