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

For exponential ER product the manufacturer shall still maintain the required number of unit hours in the maintenance

period using those styles produced in order to remain qualified to the applicable failure rate levels. In the case where

the lowest failure rate for an un-produced style is M, styles need not be manufactured for testing only but the

manufacturer must certify that the capability and facilities needed to produce that style are still in place. In the event

that units must be built for the purpose of maintaining the required hours, they shall also undergo all required testing

prior to being placed on life test. For ER exponential or non-ER parts, if during three consecutive reporting periods

there has been no production of a given style, the manufacturer may be required, at the discretion of the qualifying

activity, to submit a newly-produced (not from stock) representative product of that style to testing.

For Weibull parts, if during two consecutive reporting periods, there has been no production of the lowest Weibull

failure rate level for which the manufacturer is qualified for any QPL style device, the manufacturer may be required,

at the discretion of the qualifying activity, to submit a newly-produced (not from stock) representative product of that

style to testing to the lowest Weibull failure rate in accordance with qualification inspection requirements.

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A inspections. For

"T" level, inspection of product for delivery shall consist of group A and group C, subgroups I, II, and III.

4.6.1.1 Inspection and production lot.

4.6.1.1.1 Inspection lot (exponential distribution). An inspection lot shall consist of capacitors of the same

specification sheet (see 3.1), from the same production line or lines, of the same basic design, produced under

essentially the same conditions, and offered for inspection during a single month. Capacitors of the same

specification sheet must be maintained to at least the P level. The capacitance values and voltages produced shall

be represented in the lot in approximately the ratio of production. Voltage groups shall be as follows:

Group I

4 to 20 volts inclusive

Group II

25 to 50 volts inclusive

4.6.1.1.2 Inspection lot (Weibull distribution). An inspection lot shall consist of capacitors of the same specification

sheet (see 3.1), voltage rating, style, and nominal capacitance rating produced in the same case size. Manufacture

of all parts in the lot shall have been started, processed, assembled, and tested as a group. Lot identity shall be

maintained throughout the manufacturing cycle. All anodes shall be fabricated from a single identifiable powder lot.