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

2.3 Non-government publications. The following documents form a part of this document to the extent

specified herein. Unless otherwise specified, the issues of the documents which are those listed in the

solicitation or contract.

TECHAMERICA

Assessment of Outgoing Nonconforming Levels in Parts Per Million (PPM).

Statistical Process Control Systems (SPC).

(Copies of these documents are available online at www.techamerica.org or from TechAmerica, 601

Penn NW, North Building, Suite 600, Washington DC, 20004-2650.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, or in the event of a conflict

between the text of this document and the references cited herein (except for related specification

sheets), the text of this document takes precedence. Nothing in this document, however, supersedes

applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Specification sheets. The individual item requirements shall be as specified herein and in

accordance with the applicable specification sheet. In the event of any conflict between the requirements

of this specification and the specification sheet, the latter shall govern (see 6.2).

3.2 Qualification. The resistors furnished under this specification shall be products which are

authorized by the qualifying activity for listing on the applicable Qualified Products List (QPL) at the time

of award of contract (see 4.4 and 6.3). In addition, the manufacturer shall obtain certification from the

qualifying activity that the reliability and quality requirements of 4.2 have been met and are being

maintained. Authorized distributors that are approved to MIL-STD-790 distributor requirements by the

QPL manufacturer are listed in the QPL.

3.3 QPL system. The manufacturer shall establish and maintain a QPL system for parts covered by

this specification. Requirements for this system are specified in MIL-STD-790 (all product levels) and

MIL-STD-690 (ER parts only). In addition, the manufacturer shall also establish a Statistical Process

Control (SPC) and Part Per Million (ppm) system that meets the requirements as described in 3.3.1 and

3.3.2 respectively.

3.3.1 SPC system. As part of the overall MIL-STD-790 QPL system, the manufacturer shall establish a

SPC system that meets the requirements of EIA-557. Typical manufacturing processes for application of

SPC include formation of resistance elements, weld strength, trimming, and termination. In addition, the

manufacturer shall demonstrate resistance temperature characteristic (RTC) control in the process.