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

4.4.4.1.1 Exponential. Exponential FR qualification shall be in accordance with the general and detailed

requirements in MIL-STD-690 and the following details:

a. Procedure I: Qualification at the initial FRL. Level "M" (1.0 percent) of FRSP-60 shall apply. Sample units

shall be subjected to the qualification inspection specified in group VI, table VI (see 4.4.2). The entire life

test sample shall be continued on test to 10,000 hours, as specified in 4.7.19.1, on completion of the 2,000

hour qualification tests.

b. Procedure II: Extension of qualification to lower FRL's. To extend qualification to the "P" FRL, data from

two or more voltages within a style may be combined. For FRL's "R" and "S", the following styles of similar

construction (see 4.6.1.1) may be combined: CWR09, CWR11, CWR19 and CWR29.

c. Procedure III: Maintenance of FRL qualification. Maintenance period B of FRSP-10 shall apply.

Regardless of the number of production lots produced during this period, the specified number of unit hours

shall be accumulated to maintain qualification.

4.4.4.1.2 Weibull. Weibull FR qualification will be granted only to manufacturers who have achieved FRL P for any

capacitor style covered by this specification in accordance with 4.4.4.1.1. To extend qualification to include Weibull

FRL's, the manufacturer shall demonstrate the capability of Weibull FR grading (see 4.7.20) to the qualifying activity.

If during two consecutive reporting periods there has been no production of the lowest Weibull FRL for which the

manufacturer is qualified, the manufacturer may be required, at the discretion of the qualifying activity, to submit a

product of each style to testing in accordance with the qualification inspection requirements. Failure to meet this

requirement shall result in a loss of the manufacturer's FR to the lowest FR last demonstrated.

4.4.4.2 Quality level verification. The contractor is responsible for establishing a quality system to verify the ppm

defect level of lots that are subjected to the group A inspections. The ppm defect level shall be maintained for each

specification sheet. The ppm defect level shall be based on a 6-month moving average.

4.5 Verification of qualification. Every 6 months, the manufacturer shall provide verification of qualification to the

qualifying activity. Continued qualification is based on meeting the following requirements.

b. The capacitor design has not been modified.

c. Lot rejection for group A does not exceed 5 percent or one lot, whichever is greater; not applicable to

d. Periodic group C inspection.

e. Verification of FRL's.

PPM assessment. The ppm level defect shall be maintained for each performance specification sheet.

g. Continued qualification to non-ER (A level) shall be based upon continued maintenance of qualification for

the ER part FRL B.

In the event that there is no production of a single style ER or non-ER device during a maintenance period and the

manufacturer is listed for more than one style on the QPL, a report shall be submitted certifying that the manufacturer

still has the capabilities and facilities necessary to produce that product.