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

3.27.4 Supplying to higher product levels. A manufacturer may supply to all higher FR levels than that

to which they are qualified. Parts qualified and marked to lower FR levels, with procuring agency

approval, are substitutable for higher rate level parts, and shall not be remarked unless specified in the

contract or purchase order (see 6.2 and table VII).

TABLE VII. Product level substitution.

Product

Acceptable product

level

level substitution

S (.001)

R (.01)

S, R

P (0.1)

S, R, P

M (1.0)

C (non-ER)

S, R, P, M

3.27.5 Supplying lower resistance tolerances. Parts qualified and marked to more restrictive tolerance

levels, with procuring agency approval, are substitutable for parts marked to higher tolerances levels and

shall not be remarked unless specified in the contract or purchase order (see 6.2 and table VIII).

TABLE VIII. Resistance tolerance substitution.

Resistance

Acceptable

tolerance

resistance

tolerance substitution

F, G

F, G, J

3.28 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or

environmentally preferred materials should be used to the maximum extent possible provided that the

materials meets or exceeds the operational and maintenance requirements, and promotes economically

advantageous life cycle costs.

3.29 Workmanship. Resistors shall be processed in such a manner as to be uniform in quality and

shall be free any defects that will affect life, serviceability or appearance.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as

follows:

a. Qualification inspection (see 4.4).

b. Verification of qualification (see 4.5).

Conformance inspection (see 4.6).

d. Periodic group C inspection (see 4.7).