DIN EN 60115-1:2025-01

This part of the 60115 series of standards is a generic specification and is applicable to fixed resistors for use in electronic equipment. Fixed resistors are resistors whose resistance value is only slightly dependent on the applied voltage, the prevailing temperature, or a mechanical setting. This document introduces standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. If the individual topics require the specification of conditions or parameters that specifically relate to the particular subfamily or type of fixed resistors, then these specifications shall be stated in one of the subordinate specifications. The standard differs from DIN EN 60115-1:2016-03 as follows: a) this edition uses a new document structure in which the tests of the previous Clause 4 are now listed in Clauses 6 to 12, with an informative Annex ZX providing a list of cross-references to the previous version of this standard; b) the terms have been revised and amended, supplemented by a new clause on resistor technologies and a new clause on product classification levels; c) a new Subclause 4.7 on recommendations for permissible substitutions has been added; d) the provisions for packaging, storage, and transport in 4.8, 4.9, and 4.10 have been completely revised; e) a new Subclause 5.3 on standard limit deviations for the most common test parameters has been added; f) the generic resistance measurement procedure, now 5.6, has been separated from the test for compliance with a specified resistance value in 6.1 as a revision of the previous 4.5; g) the test for the temperature coefficient of the resistance value from 6.2 is a revision of the previous test 4.8, Temperature dependence of the resistance value, whereby the special concessions for resistances below 10 ohms have been omitted; h) the high-voltage overload test with single pulses from 8.2 (previously 4.27) has been completely revised; i) the high-voltage overload test with periodic pulses from 8.3 (previously 4.28) has been revised and a corrected table with severity levels has been provided; j) the overload test with periodic pulses from 8.4 (previously 4.39) has been rejected and simplified and now includes the severity level previously used in subordinate specifications; k) Subclause 9.1 on visual inspection, 9.2 on gauge measurements, and 9.3 on the evaluation of individual measurements (previously all parts of 4.4) have been completely revised; l) tests for mechanical strength of connections (previously 4.16) have been revised and divided into tests for the strength of solderable connections, 9.5, and tests for the strength of pin or screw connections, 9.6; m) the continuous shock test from 9.9 (previously 4.20) and the shock test from 9.10 (previously 4.21) have been revised to reflect the combined corresponding test standard EN 60068-2-29; n) the accelerated test "moist heat, constant" from 10.5 (previously 4.37) has been supplemented by an option for a reduced number of stress cycles; o) the corrosion test from 10.6 has been completely revised to apply the more suitable test method according to EN 60068-2-52 instead of the previously used EN 60068-2-11; p) the whisker growth test from 10.7 has been revised to reflect the changes in the new version of the test methods in EN IEC 60068-2-82; q) the test methods for solderability in 11.1 (previously 4.17) and for heat resistance during soldering in 11.2 (previously 4.18) have been completely revised to include the necessary option for selecting leaded solder alloys and lead-free solder alloys as well as the corresponding process conditions; r) the solvent resistance test from 11.3 combines the previous tests 4.29, Solvent resistance of the component, and 4.30, Solvent resistance of the marking, into one test; s) the "Hazardous overload" test from 12.3 (previously 4.26) has been completely revised. Specifications for fixed resistors for use in electronic circuits and equipment are organized in a three-level hierarchy: generic specification, sectional specification, and detail specification. The generic specification covers everything that applies or is applicable to the entire range of fixed resistors, in particular terms and test methods. Sectional specifications provide specifications that are only applicable to the part of the product range described therein and are mostly used in associated detail specifications. These are typically preferred values for types and their dimensions, for characteristic electrical parameters, but also specific specifications for the application of test methods specified in the technical specification, or even the description of additional, specific methods. Each sectional specification also provides a set of preferred acceptance criteria for the resistors after the respective tests and outlines test plans, which are specified in detail in the associated detail specifications. In the field of fixed resistors for use in electronic circuits and equipment the following sectional specifications are available, among others: - low power layer resistors with lead wires - high power resistors - low power resistors for surface mounting - resistor arrays and networks for surface mounting. Detail specifications provide all the information necessary to comprehensively describe a type and range of fixed resistors, either directly in the text or by reference to the designated higher-level documents. This includes specifications for dimensions and properties, as well as all the information necessary for the application of a quality assurance system (test plan, severity of tests, acceptance criteria). Detail specifications are not usually issued by the relevant IEC Technical Committee. However, for the purpose of global harmonization of all detail specifications for a particular type of fixed resistor, templates for a detail specification define the form and minimum requirements for the content of the detail specifications to be drafted.