MIL-PRF-39005 Resistors, Fixed, Wirewound \(Accurate\), Nonestablished Reliability, Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\), established reliability \(ER\), accurate, wire-wound, fixed resistors that have a maximum resistance tolerance of 1 percent and a high degree of stability with respect to time under specified environmental conditions. The resistors are capable for continuous full-load \(or voltage\) operation at any ambient temperature up to 125??C, and when derated, up to 145??C \(see 6.5\). They are not capable for application where the alternating current \(ac\) characteristics are of critical importance. ER resistors have life failure rates \(FR\) ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.5\). These FR are established at 60-percent confidence level on the basis of the life tests. The FR, identified by the appropriate symbol, is referred to operation at full rated voltage and temperature.

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MIL-PRF-39005G

a. The nominal ohmic value shall be marked below the broken line as shown.

JRBR52L-----AM

1123550

b. If two lines are used, the nominal ohmic value shall be marked below the last line of the

PIN as shown.

JRBR52L

-----AM

1123550

NOTE: Standard marking procedure as shown (see 3.25), where applicable.

3.25.2 Alternate marking. When the physical size of the resistor precludes the marking of the above in

3.25, the alternate method will be as specified in the associated specification sheet (see 3.1).

3.26 Product level substitution. A manufacturer may supply to all higher FRL s than that to which he is

qualified. Parts qualified and marked to lower FRL s are substitutable, with acquiring agency approval, for

higher FRL parts, and shall not be remarked unless specified in the contract or order (see table VII).

TABLE VII. Product level substitution.

Product level

Product level substitute

---

S, R

S, R, P

C (non-ER)

S, R, P, M

3.26.1 Resistance tolerance substitution. A manufacturer may supply to all higher resistance

tolerances than that to which he is qualified. Parts qualified and marked to lower resistance tolerances

are substitutable, with acquiring agency approval, for higher tolerance parts and shall not be remarked

unless specified in the contract or order (see table VIII).

TABLE VIII. Resistance tolerance substitution.

Resistance

Resistance tolerance

tolerance

substitute

---

T, Q

T, Q, A

T, Q, A, B

3.27 Soldering. Electrical connections shall be mechanically secure before and electrically continuous

after soldering.

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

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

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

advantageous life cycle costs.