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

4.6.1.2.9 PPM calculations . The manufacturer shall establish a ppm system in accordance with 3.3.2 for

assessing and calculating average outgoing quality of capacitors. A ppm rate combining dc leakage, capacitance,

dissipation factor, and ESR shall be assessed for lots that have passed the group A inspection. The manufacturer's

ppm system shall also address rectification procedures for lots failing ppm assessment. Data from the rectification

process shall not be used to calculate ppm.

4.6.1.3 Periodic group C inspection (ER only). Group C inspection shall consist of the tests specified in table X, in

the order shown. Group C inspection shall be made on sample units selected from inspection lots which have

passed group A inspection; however, sample units subjected to surge voltage and solderability shall not be used.

4.6.1.3.1 Sampling plan. There shall be 87 (up to 62 for Weibull) sample units of each specification sheet taken

from production every 3 months and subdivided as specified for the subgroups listed in table X and subjected to the

tests specified in those subgroups, in the order shown. The maximum and minimum case sizes manufactured during

that 3-month period shall be represented in the sample in at least the approximate ratio of production. Styles

CWR09, CWR19, and CWR29 may be combined for group C inspection, styles CWR06 and CWR16 may be

combined for Group C testing as well. On an annual basis, all voltage groups produced, as defined in 4.6.1.1.1, shall

be represented. Allowable failures shall be as specified in table X.

4.6.1.3.2 Disposition of sample units. Sample units which have been subjected to group C inspection shall not be

delivered on the contract or order.

4.6.1.3.3 Noncompliance. If the sample fails to pass group C inspection, the supplier shall take corrective action

on the materials or processes, or both, as warranted, and on all units of product which can be corrected and which

were manufactured under essentially the same conditions, with essentially the same materials and processes, and

which are considered subject to the same failure. Acceptance of the product shall be discontinued until corrective

action, acceptable to the Government, has been taken. After the corrective action has been taken, group C

inspection shall be repeated on additional sample units (all inspections or the inspection that the original sample

failed, at the option of the Government). Group A inspection may be reinstituted; however, final acceptance shall be

withheld until the group C reinspection has shown the corrective action was successful. In the event of failure after

reinspection, information concerning the failure and corrective action taken shall be furnished to the cognizant

inspection activity and the qualifying activity.