MIL-PRF-39017 Resistors, Fixed, Film \(Insulated\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), insulated, film, fixed resistors. These resistors are capable of full load operation at an ambient temperature of 70 Degrees C and have a resistance temperature characteristic of 100 parts per million \(PPM\) and 350 PPM per degree Celsius \(PPM/Degrees C\). The ER resistors have life failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.4\). These FR levels are established at a 60 percent confidence level on the basis of life tests. Designers are CAUTIONED on using these resistors in high power pulse applications \(see 6.13.2\).

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MIL-PRF-39017G

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

e. Periodic group C inspection.

FR levels.

g. PPM assessment (NOTE: Grouping of style is permitted).

h. Continued qualification to non-ER ("C") shall be based on continued maintenance of qualification

for the ER part (minimum "P" FR level maintained).

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery.

4.6.1.1 Non-ER resistors. Inspection of product for delivery shall consist of the requirements in 4.6.3.1.

4.6.1.2 ER resistors. Inspection of product for delivery shall consist of group A and group B

inspections. Group B inspection for preparation of delivery is not required when the qualifying activity has

allowed group B testing to be performed annually (see table XIII).

4.6.2 Inspection and production lot.

4.6.2.1 Inspection lot. An inspection lot, as far as practicable, shall consist of all resistors of the same

style, characteristic, and protective enclosure or coating and manufactured under essentially the same

process and conditions during a manufacturing period of 1 month maximum. For purposes of lot

formation all terminal types may be included in the same lot; however, all lead types which are combined

shall have the same method of terminal attachment. All leads in the lot shall be represented in a similar

proportion by samples selected for inspection. Non-ER and ER lots shall be kept separate.

4.6.2.2 Production lot. A production lot shall consist of all resistors of the same style, nominal

resistance value, resistance tolerance, resistance temperature characteristic, and termination type.

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. Non-ER and ER lots shall be kept

separate.

4.6.3 Group A inspection.

4.6.3.1 Non-ER resistors. The manufacturer shall establish and maintain an inspection system to

verify resistors meet dc resistance, visual/mechanical, and solderability requirements. In-line or process

control may be part of such a system. The inspection system shall also include criteria for lot rejection

and corrective actions. The inspection system shall be verified under the overall MIL-STD-790 QPL

system. NOTE: Since the non-ER (C level) is the ER design without the mandatory conformance

inspection and FR level assessment, this product is still expected to meet the environmental qualification

type requirements (e.g., moisture resistance, shock, vibration, etc.).