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

3.5.3.1 Pure tin. The use of pure tin, as an underplate or final finish is prohibited both internally and

externally. Tin content of resistor components and solder shall not exceed 97 percent, by mass. Tin

shall be alloyed with a minimum of 3 percent lead, by mass (see 6.16).

3.5.3.2 Flux. Flux shall be of such a quality as to enable the resistors to meet all the requirements of

this specification.

3.5.3.3 Solder dip (retinning) leads. The manufacturer (or his authorized category B or category C

distributor) may solder dip/retin the leads of product supplied to this specification provided the solder dip

process (see appendix) has been approved by the qualifying activity.

3.5.4 Weight. Resistors shall not exceed the maximum weight specified (see 3.1).

NOTE: Exposed copper or base metal due to lead attachment within .050 (1.27 mm) of the resistor

body shall not be considered a reliability problem.

FIGURE 1. Solderability requirements.