MIL-PRF-914 Resistor Networks, Fixed, Film, Surface Mount, Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), hermetically sealed \(see 3.27\) and nonhermetically sealed networks \(see 3.27.1\). These networks consist entirely of fixed, film resistors. They are primarily intended for use in surface mount applications where space is a major concern. ER resistors covered by this specification will have life failure rates \(FR\) ranging from 1 percent to 0.001 percent per 1,000 hours \(see 1.2.1.7\). The ER FR are established at a minimum 60-percent confidence level on the basis of life tests. Designers are CAUTIONED on using these resistors in pulse applications \(see 6.4.4\).

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MIL-PRF-914C

4.4.2 Test routine. Sample units shall be subjected to the qualification inspection specified in table XII, in the order

shown. All sample units shall be subjected to the inspection of group I, except for the sample units required for

group X. All sample units shall be divided as specified in table XII for group II through group IX inclusive, and

subjected to the inspection for their particular group. Sample sizes and extent of qualification shall be as specified in

appendix A of this specification.

4.4.3 Defectives. Defectives in excess of those allowed in table XII shall be cause for refusal to grant qualification.

4.4.4 FRL and quality level verification (ER styles only).

4.4.4.1 FR qualification. FR qualification shall be in accordance with the general requirements and detail

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

Procedure I: Qualification at the initial FR level. Level M (1.0 percent of FRSP-60) shall apply. Sample

units shall be subjected to the qualification inspection specified in group VII of table XII (see 4.4.2). Entire

life test sample shall continue on test to 10,000 hours as specified in 4.8.19, upon completion of the 2,000

hour qualification.

Procedure II: Extension of qualification to lower FR levels. To extend qualification to the R (0.01 percent)

and S (0.001 percent) FRL, unit hours from two or more styles of similar construction may be combined.

Style combinations shall be as described for lot formation (see 4.6.2.1).

Procedure III: Maintenance of FR level 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 (see 4.7, periodic group C inspection).

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.

Design of networks has not been modified.

Lot rejection for group A (subgroup 1 and subgroup 3) does not exceed 5 percent or one lot, whichever is

greater.

Lot rejection for group B does not exceed 5 percent or one lot, whichever is greater.

Periodic group C inspection.

FRL.

PPM assessment (NOTE: Grouping of styles is permitted).

Continued qualification to non-ER level (C) shall be based on continued maintenance of qualification for the

ER part (minimum M FRL maintained).

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery.

4.6.1.1 Non-ER networks. Group A inspection for non-ER resistors shall be used for preparation for delivery

(see 4.6.3.1, non-ER group A inspection).

4.6.1.2 ER networks. Inspection of product for delivery shall consist of the group A and group B inspection.