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

6.15 Subject term (keyword listing).

Axial leads

Semiprecision

Small size

Solderable

Weldable

6.16 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may

exhibit tin whisker growth problems (see 3.5.3.1) after manufacture. Tin whiskers may occur anytime

from a day to years after manufacture and can develop under typical operating conditions, on products

that use such materials. Conformal coatings applied over top of a whisker-prone surface will not prevent

the formation of tin whiskers. Alloys of 3 percent lead, by mass, have shown to inhibit the growth of tin

whiskers. For additional information on this matter, refer to ASTM-B545 (Standard Specification for

Electrodeposited Coatings of Tin).

6.17 Environmentally preferable material. Environmentally preferable materials should be used to the

maximum extent possible to meet the requirements of this specification. Table XIX lists the

Environmental Protection Agency (EPA) top seventeen hazardous materials targeted for major usage

reduction. Use of these materials should be minimized or eliminated unless needed to meet the

requirements specified herein (see section 3).

TABLE XIX. EPA top seventeen hazardous materials.

Benzene

Dichloromethane

Tetrachloroethylene

Cadmium and Compounds

Lead and Compounds

Toluene

Carbon Tetrachoride

Mercury and Compounds

1,1,1 � Trichloroethane

Chloroform

Methyl Ethyl Ketone

Trichloroethyene

Chromium and Compounds

Methyl Isobutyl Ketone

Xylenes

Cyanide and Compounds

Nickel and Compounds

6.18 Changes from previous issue. The margins of this specification are marked with asterisks to

indicate where changes from the previous issue were made. This was done as a convenience only and

the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and

contractors are cautioned to evaluate the requirements of this document based on the entire content

irrespective of the marginal notations and relationship to the last previous issue.