prEN IEC 60115-4-20:2025
(Main)Fixed resistors for use in electronic equipment - Part 4-20: Blank detail specification: Power resistors with axial leads for through-hole assembly on circuit boards (THT), for high performance electronic equipment, classification level P, or for high-performance high-reliable electronic equipment, classification level R
Fixed resistors for use in electronic equipment - Part 4-20: Blank detail specification: Power resistors with axial leads for through-hole assembly on circuit boards (THT), for high performance electronic equipment, classification level P, or for high-performance high-reliable electronic equipment, classification level R
Résistances fixes utilisées dans les équipements électroniques - Partie 4-20: Spécification particulière-cadre: Résistances de puissance à broches axiales pour assemblage par trous traversants sur cartes de circuit imprimé (THT), pour les équipements électroniques de haute performance (niveau de classification P), ou pour les équipements électroniques de haute performance et de haute fiabilité (niveau de classification R)
Fiksni upori za uporabo v elektronski opremi - 4-20. del: Neizpolnjena podrobna specifikacija - Močnostni upori z aksialnimi priključki za montažo skozi prehodne luknje tiskanih vezij (THT) za visokozmogljivo elektronsko opremo, razvrstitvena raven P, ali za visokozmogljivo in zelo zanesljivo elektronsko opremo, razvrstitvena raven G
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2026
Fiksni upori za uporabo v elektronski opremi - 4-20. del: Neizpolnjena podrobna
specifikacija - Močnostni upori z aksialnimi priključki za montažo skozi prehodne
luknje tiskanih vezij (THT) za visokozmogljivo elektronsko opremo, razvrstitvena
raven P, ali za visokozmogljivo in zelo zanesljivo elektronsko opremo,
razvrstitvena raven G
Fixed resistors for use in electronic equipment - Part 4-20: Blank detail specification:
Power resistors with axial leads for through-hole assembly on circuit boards (THT), for
high performance electronic equipment, classification level P, or for high-performance
high-reliable electronic equipment, classification level R
Résistances fixes utilisées dans les équipements électroniques - Partie 4-20:
Spécification particulière-cadre: Résistances de puissance à broches axiales pour
assemblage par trous traversants sur cartes de circuit imprimé (THT), pour les
équipements électroniques de haute performance (niveau de classification P), ou pour
les équipements électroniques de haute performance et de haute fiabilité (niveau de
classification R)
Ta slovenski standard je istoveten z: prEN IEC 60115-4-20:2025
ICS:
31.040.10 Fiksni upor Fixed resistors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
40/3265/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60115-4-20 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-12-05 2026-02-27
SUPERSEDES DOCUMENTS:
40/3207/CD, 40/3248/CC
IEC TC 40 : CAPACITORS AND RESISTORS FOR ELECTRONIC EQUIPMENT
SECRETARIAT: SECRETARY:
Netherlands Mr Ronald Drenthen
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Fixed resistors for use in electronic equipment - Part 4-20: Blank detail specification: Power
resistors with axial leads for through-hole assembly on circuit boards (THT), for high
performance electronic equipment, classification level P, or for high-performance high-reliable
electronic equipment, classification level R
PROPOSED STABILITY DATE: 2034
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, o r any part of it,
for any other purpose without permission in writing from IEC.
IEC CDV 60115-4-20 © IEC:2025
1 CONTENTS
3 FOREWORD . 5
4 1 Scope . 11
5 2 Normative references . 12
6 3 Terms and definitions . 13
7 4 Characteristics and ratings . 13
8 4.1 General . 13
9 4.2 Dimensions . 13
10 4.3 Ratings . 15
11 4.4 Resistance range and tolerance on resistance . 17
12 5 Tests and test severities . 18
13 5.1 General . 18
14 5.2 Resistance . 19
15 5.3 Temperature coefficient of resistance . 19
16 5.4 Temperature rise . 19
17 5.5 Endurance . 19
18 5.6 Endurance at a maximum temperature: UCT . 19
19 5.7 Short-term overload . 20
20 5.8 Single-pulse high-voltage overload test . 20
21 5.9 Periodic-pulse high-voltage overload test . 20
22 5.10 Electrostatic discharge (ESD) test . 21
23 5.11 Visual examination . 21
24 5.12 Gauging of dimensions . 21
25 5.13 Detail dimensions . 22
26 5.14 Robustness of terminations . 22
27 5.15 Vibration . 22
28 5.16 Rapid change of temperature . 22
29 5.17 Rapid change of temperature, ≥ 100 cycles . 22
30 5.18 Climatic sequence . 22
31 5.19 Damp heat, steady state . 23
32 5.20 Solderability, with lead-free solder . 23
33 5.21 Solderability, with SnPb solder . 24
34 5.22 Resistance to soldering heat . 24
35 5.23 Solvent resistance . 24
36 5.24 Insulation resistance . 24
37 5.25 Voltage proof . 24
38 5.26 Flammability . 25
39 6 Performance requirements . 25
40 6.1 General . 25
41 6.2 Limits for change of resistance at tests . 25
42 6.3 Temperature coefficient of resistance . 27
43 6.4 Temperature rise . 27
44 6.5 Visual examination . 27
45 6.6 Solderability . 28
46 6.7 Insulation resistance . 28
IEC CDV 60115-4-20 © IEC:2025
47 6.8 Flammability . 29
48 6.9 Non-linearity . 29
49 7 Marking, packaging and ordering information . 29
50 7.1 Marking of the component . 29
51 7.2 Packaging . 30
52 7.3 Marking of the packaging . 30
53 7.4 Ordering information . 30
54 8 Additional information . 30
55 8.1 General . 31
56 8.2 Storage and Transportation. 31
57 8.3 Substrate for assembly . 31
58 8.4 Soldering process . 31
59 8.5 Use of cleaning agents or solvents. 31
60 8.6 Coating or potting after assembly . 32
61 9 Quality assessment procedures . 32
62 9.1 General . 32
63 9.2 Qualification approval . 33
64 9.3 Maintenance of a qualification approval . 34
65 9.4 Sample size for assessment of a failure rate level . 34
66 Annex A (normative) Symbols and abbreviated terms . 48
67 A.1 Symbols . 48
68 A.2 Abbreviated terms . 50
69 Annex B (normative) Reference for visual examination . 51
70 Annex C (informative) Application note on … . 52
71 Bibliography . 53
73 Figure 1 – Outline and dimensions . 13
74 Figure 2 – Lead eccentricity of the wire terminations . 15
75 Figure 3 – Length of excessive coating on the wire terminations . 15
76 Figure 4 – Derating curve for power resistors . 16
rd
77 Figure 5 – 3 harmonic ratio requirement A . 29
3 min
79 Table 1 – Styles and dimensions . 14
80 Table 2 – Climatic categories . 15
81 Table 3 – Ratings . 16
82 Table 4 – Temperature coefficients, tolerances and resistance ranges of products
83 classified to level P, for climatic category . / . / . . 17
84 Table 5 – Temperature coefficients, tolerances and resistance ranges of products
85 classified to level R, for climatic category . / . / . . 18
86 Table 6 – Short-term overload duration . 20
87 Table 7 – Pulse voltage factors for the single-pulse high-voltage overload test . 20
88 Table 8 – Pulse voltage factors for the periodic-pulse high-voltage overload test . 21
89 Table 9 – ESD test voltages . 21
90 Table 10 – Number of temperature cycles of the rapid change of temperature test . 22
91 Table 11 – Additional cycles of the damp heat, cyclic test . 23
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92 Table 12 – Damp heat, steady state test duration . 23
93 Table 13 –Limits for change of resistance at tests . 26
94 Table 14 – Permitted change of resistance due to the variation of temperature . 27
95 Table 15 – Required sample size for qualification of a failure rate level . 35
96 Table 16 – Sample size for maintenance of a failure rate level based on a 60 %
97 statistical confidence level . 36
98 Table 17 – Sample size for maintenance of a failure rate level based on a 10 %
99 statistical confidence level . 36
100 Table 18 – Test schedule for the qualification approval of power resistors (1 of 5) . 37
101 Table 19 – Test schedule for quality conformance inspection of power resistors (1 of 5) . 42
IEC CDV 60115-4-20 © IEC:2025
104 INTERNATIONAL ELECTROTECHNICAL COMMISSION
105 ____________
107 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT –
109 Part 4-20: Blank detail specification:
110 Power resistors with axial leads
111 for through-hole assembly on circuit boards (THT),
112 for high-performance electronic equipment, classification level P,
113 or for high-performance and high-reliable electronic equipment,
114 classification level R
116 FOREWORD
117 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
118 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
119 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
120 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
121 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
122 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
123 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
124 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
125 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
126 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
127 consensus of opinion on the relevant subjects since each technical committee has representation from all
128 interested IEC National Committees.
129 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
130 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
131 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
132 misinterpretation by any end user.
133 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
134 transparently to the maximum extent possible in their national and regional publications. Any divergence between
135 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
136 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
137 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
138 services carried out by independent certification bodies.
139 6) All users should ensure that they have the latest edition of this publication.
140 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
141 members of its technical committees and IEC National Committees for any personal injury, property damage or
142 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
143 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
144 Publications.
145 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
146 indispensable for the correct application of this publication.
147 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
148 rights. IEC shall not be held responsible for identifying any or all such patent rights.
149 IEC 60115-4-20 has been prepared by IEC technical committee 40: Capacitors and resistors
150 for electronic equipment. It is an International Standard
151 This edition includes the following significant technical changes with respect to the high
152 performance and high reliable previous edition:
153 a) it employs the product classification based on application requirements as defined in the
154 generic specification IEC 60115-1:2020;
155 b) it permits the specification additional dimensional requirements concerning the
156 eccentricity of termination wires and the coating extending onto wires;
IEC CDV 60115-4-20 © IEC:2025
157 c) it provides for a tabulated presentation of resistance ranges in relationship to the
158 temperature coefficient and the tolerance;
159 d) it supports solderability testing for both, traditional lead-bearing soldering and up-to-date
160 lead-free soldering, as required;
161 e) it introduces a test for the specimens’ robustness to electrostatic discharge if required;
162 f) it introduces a test for the specimens’ resistance to solvents if required;
163 g) it introduces a test for the flammability of the specimens if required;
164 h) it employs consistent stability requirements grouped in stability classes;
165 i) it supports the provision of detailed visual acceptance criteria
166 j) it includes the requirement for a visual inspection of the primary and proximity packaging;
167 k) it provides the correlated test schedules for a qualification approval and for subsequent
168 quality conformance inspections side by side;
169 l) it employs quality assessment procedures which meet the requirements of a zero -defect
170 approach, which evades the use of historic AQL levels and the permission of non -
171 conforming specimens in test groups;
172 m) it provides for the inclusion of specific visual acceptance criteria, to be applied in addition
173 to those given in Annex B of the sectional specification IEC 60115-4:2022;
175 The text of this International Standard is based on the following documents:
FDIS Report on voting
XX/XX/CDV XX/XX/RVD
177 Full information on the voting for the approval of this International Standard can be found in the
178 report on voting indicated in the above table.
179 The language used for the development of this International Standard is English
180 A list of all parts in the IEC 60115 series, published under the general title Fixed resistors for
181 use in electronic equipment, can be found on the IEC website.
182 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
183 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
184 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
185 described in greater detail at www.iec.ch/publications
186 The committee has decided that the contents of this document will remain unchanged until the
187 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
188 the specific document. At this date, the document will be
189 • reconfirmed,
190 • withdrawn,
191 • replaced by a revised edition, or
192 • amended.
IEC CDV 60115-4-20 © IEC:2025
194 0 Introduction to the template provided by this blank detail specification
195 COMMENT This introduction is not intended to be copied into the drafted detail specification. Therefore, it is
196 positioned in front of the conventional document structure and clause numbering range. It nevertheless contains
197 normative requirements to the drafted detail specification.
198 0.1 Scope of this blank detail specification
199 This part of IEC 60115-4 is applicable to the drafting of detail specifications for power resistors
200 with leads, classified to level P or to levels P and R, based on the definitions of the product
201 classification levels in IEC 60115-1:2020, 3.4.
202 Another part of IEC 60115-4 provides a separate blank detail specification for the drafting of
203 detail specifications for power resistors with axial leads, classified to level G.
204 Yet other parts of IEC 60115-4 may be issued to provide blank detail specifications for the
205 drafting of detail specifications for power resistors with axial leads, of other technologies or of
206 other classification levels.
207 0.2 Function of this blank detail specification
208 A blank detail specification is a supplementary document to the sectional specification and
209 contains requirements for style, layout and minimum contents of detail specifications. Detail
210 specifications not complying with these requirements shall not be accepted as being in
211 accordance with IEC specifications nor shall they be described as such.
212 Detail specifications complying with the requirements of this blank detail specification are a
213 legitimate basis for the quality assessment of leaded fixed power resistors under an adequate
214 quality assessment system, e.g. the IEC Quality Assessment System for Electronic Components
215 (IECQ System), whereas the plain blank detail specification is not a suitable basis.
216 The detail specification should contain a table of contents prior the first page of the actual
217 specification.
218 In the preparation of the detail specification, the content of IEC 60115-4:2022, 8.2 shall be
219 taken into account. The detail specification should be written by using the preferred values
220 given in IEC 60115-4.
221 Units, graphical symbols and letter symbols shall, whenever possible, be taken from those
222 prescribed by the following standards:
223 – IEC 60027-1, Letter symbols to be used in electrical technology – Part 1: General
224 – IEC 60617, Graphical symbols for diagrams
225 – IEC 80000 (all parts), Quantities and units
226 – ISO 80000 (all parts), Quantities and units
227 This blank detail specification uses for its purpose two different kinds of notes:
228 – NOTE For notes which give additional information intended to assist the
229 understanding or use of the resulting document and therefore shall be copied
230 as NOTE into the drafted detail specification. As outlined in the ISO/IEC
231 directives, these notes shall not contain any requirement, instruction,
232 recommendation or permission.
233 – COMMENT For editorial notes which are intended to aid and direct the specification writer
234 and therefore shall not be copied into the drafted detail specification. In order
235 to accomplish their function, editorial notes require the use of instructions,
IEC CDV 60115-4-20 © IEC:2025
236 recommendations and permissions addressed to the writer of the detail
237 specification.
238 0.3 Identification of the detail specification and the resistor
239 The first page of the detail specification should have a layout starting with a title block as
240 recommended on the following page.
241 The numbers in square brackets are editorial references, which are not intended to be copied
242 into the drafted detail specification, and which correspond to the following information on the
243 contents which shall be inserted in the indicated fields.
244 [1] The name of the standardisation organisation under whose authority the detail
245 specification is published and, if applicable, the organization from whom the detail
246 specification is available.
247 [2] The number allocated to the detail specification by the IEC or by the responsible
248 standardisation organisation, together with the date of issue and issue number, as
249 applicable. Further reference details required by the responsible standardisation
250 organisation or quality assessment system may be given here, including an established
251 mark of conformity, as applicable.
252 [3] The number and issue date and number, as applicable, of the relevant generic
253 specification, sectional specification and blank detail specification, where the referenced
254 issues shall be the most recent issues of the respective specifications.
255 [4] The title of the detail specification, providing a short description of the type of resistors.
256 This entry should support the discrimination between similar specifications and should be
257 suitable for an entry in a register of approvals or in a catalogue of standards. It may
258 duplicate information given in fields [6] and [7] and in the textual scope in Clause 1.
259 [5] An outline drawing or illustration of the products. This entry should aid the easy
260 recognition of the specified resistors and, if possible, support the discrimination between
261 similar specifications. It may duplicate information given in Figure 1.
262 [6] Information on the typical construction of the resistors (where applicable), information of
263 the specified resistors being insulated or non-insulated (see IEC 60115-1:2020, 3.1.7),
264 and information on compatibility with a specific soldering process (if applicable, see 8.4).
265 This entry may duplicate information given in the textual scope in Clause 1.
266 [7] The classification level(s) of the resistors covered by this detail specification, the level of
267 quality assessment (Assessment level EZ), and the general level of stability requirements
268 at performance tests (Stability class).
269 This information may duplicate information given in the textual scope in Clause 1.
270 [8] Optional field for table notes.
271 [9] Statement(s) about the availability of information on components qualified to this detail
272 specification, if applied within a full quality assessment system.
274 Example for the use within the IECQ system:
276 Information about components qualified to this detail specification is available in the
277 approvals section of the website http://www.iecq.org.
IEC CDV 60115-4-20 © IEC:2025
Specification available from:
IEC 60115-4-20xx: 20yy
[1]
[2]
Electronic components of assessed quality in accordance with:
Generic specification: IEC 60115-1:2020 [3]
Sectional specification: IEC 60115-4:2022
Blank detail specification: IEC 60115-4-20:202X
FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT –
Part 4-20xx: Detail specification: Power resistors with axial leads for through-hole
assembly on circuit boards (THT),
…,
for high-performance electronic equipment, classification level P,
or for high-performance and high-reliable electronic equipment, classification level R
[4]
Technology …
[6]
Insulated / Non-insulated
Termination plating …
[5]
Product classification level P;
and/or
Product classification level R with
assessed failure rate level
Assessment level EZ [7]
Stability classes .
[8]
278 COMMENT 1 The title of the drafted detail specification, given in field [4] and in some other places, may be modified
279 in order to reflect the actually applied product classification level(s).
280 COMMENT 2 The designation of product classification levels in field [7] may be modified in order to reflect the
281 actually applied product classification level(s).
282 COMMENT 3 The remainder of this page is intentionally left empty in order to start Clause 1 on top of the next
283 page.
285 Information about components qualified to this detail specification is available ….
286 [9]
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IEC CDV 60115-4-20 © IEC:2025
290 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT –
292 Part 4-20: Detail specification:
293 Power resistors with axial leads
294 for through-hole assembly on circuit boards (THT),
295 …,
296 for high-performance electronic equipment, classification level P,
297 and/or for high-performance high-reliable electronic equipment, classification level R
299 COMMENT The above title without the introductory word “blank” is to become the title of the intended detail
300 specification, which is drafted on the basis of this blank detail specification.
301 The actual title of the intended detail specification should hold some wording descriptive for the particular kind of
302 components covered therein, where indicated by “…”, in order to support the differentiation between parallel detail
303 specification on the same level. An example for such descriptive wording would be: stability classes 0,1; 0,25.
304 The statement on the applied classification level(s) should be modified as required by the intended detail
305 specification.
306 1 Scope
307 COMMENT 1 The text of this clause may repeat information already given in some fields of the above title block.
308 Essential information on the special type of components covered by the drafted detail specification may be added,
309 preferably at the place marked with "…".
310 This detail specification specifies the characteristics and ratings of power resistors with leads
311 for use in electronic equipment, which are typically assembled in through-hole technology (THT)
312 on circuit boards.
313 .
314 The resistors covered herein are classified to level P or to level R, which includes level P.
315 Classification level P is defined in IEC 60115-1:2020, 3.4 for high-performance electronic
316 equipment, typically operated under harsh environmental conditions, typically built for an
317 extended lifetime, where uninterrupted performance is desired or mandatory. Examples for level
318 P include professional equipment, telecommunication transmission systems, industrial control
319 and measurement systems and most automotive applications operated outside the passenger
320 compartment.
321 Classification level R is defined in IEC 60115-1:2020, 3.4 for high-performance and high-
322 reliable electronic equipment, with se same operating conditions and requirements as given for
323 level P, with the additional requirement for established reliability and a formally assessed failure
324 rate level. Examples for Level R include military and defense equipment, avionics and
325 aerospace applications.
326 This detail specification is based upon the blank detail specification IEC 60115 -4-20:202X.
327 This detail specification establishes test schedules and performance requirements permitting
328 the quality assessment of the resistors covered herein according to the quality assessment
329 procedures prescribed by IEC 60115-1:2020, Annex Q.
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334 2 Normative references
335 The following documents are referred to in the text in such a way that some or all of their content
336 constitutes requirements of this document. For dated references, only the edition cited applies.
337 For undated references, the latest edition of the referenced document (including any
338 amendments) applies.
339 IEC 60062, Marking codes for resistors and capacitors
340 IEC 60063, Preferred number series for resistors and capacitors
341 IEC 60115-1:2020, Fixed resistors for use in electronic equipment – Part 1: Generic
342 specification
343 IEC 60115-2:2023, Fixed resistors for use in electronic equipment – Part 2: Sectional
344 specification – Low-power film resistors with leads for through-hole assembly on circuit boards
345 (THT)
346 IEC 60115-4:2022, Fixed resistors for use in electronic equipment – Part 4: Sectional
347 specification – Power resistors for through-hole assembly on circuit boards (THT) or for
348 assembly on chassis
349 IEC 60115-4-20:202x, Fixed resistors for use in electronic equipment – Part 4-20: Blank detail
350 specification –Power resistors with axial leads for through-hole assembly on circuit boards (THT
351 IEC 60286-1, Packaging of components for automatic handling – Part 1: Tape packaging of
352 components with axial leads on continuous tapes
353 IEC 60294, Measurement of the dimensions of a cylindrical component with axial terminations
354 IEC 60301, Preferred diameters of wire terminations of capacitors and resistors
355 IEC 61760-1, Surface mounting technology – Part 1: Standard method for the specification of
356 surface mounting components (SMDs)
357 IEC 61193-2:2007, Quality assessment systems - Part 2: Selection and use of sampling plans
358 for inspection of electronic components and packages
359 .
360 COMMENT 1 The above list of normative references provides an example and needs to be adapted to the actual
361 requirements of the drafted detail specification.
362 COMMENT 2 According to the ISO/IEC directives, dated references are required when reference is made to a
363 specific part of the referenced standard and generally should be applied only in such cases.
364 COMMENT 3 It is recommended to update any dated references to the most recent revision of the referenced
365 standard when drafting a detail specification. This involves updating of the dated normative references within the
366 text of the drafted detail specification.
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368 3 Terms and definitions
369 For the purposes of this document, the terms and definitions given in IEC 60115-1 and in
370 IEC 60115-4, as well as the following, apply.
372 …
373 COMMENT Any terms and their respective definitions specifically required for the scope of the drafted detail
374 specification may be inserted in the space marked with "…", using the prescribed numbering and format. Otherwise,
375 the above statement should be reduced to "For the purposes of this document, the terms and definitions given in
376 IEC 60115-1 and in IEC 60115-4 apply." if no further terms or definitions are required in the drafted detail
377 specification.
378 ISO and IEC maintain terminological databases for use in standardization at the following
379 addresses:
380 • IEC Electropedia: available at http://www.electropedia.org/
381 • ISO Online browsing platform: available at http://www.iso.org/obp
382 4 Characteristics and ratings
383 4.1 General
384 Various parameters of this component are precisely defined in this specification. Unspecified
385 parameters can vary from one component to another.
386 4.2 Dimensions
387 The shape and dimensions of the resistors covered by this specification are shown in Figure 1,
388 with the specific styles and their respective dimensions given in Table 1. Other shapes are
389 permissible within the given dimensions.
391 Figure 1 – Outline and dimensions
IEC CDV 60115-4-20 © IEC:2025
392 COMMENT 1 See IEC 60115-4:2022, 8.2.1.
393 COMMENT 2 The details shown in Figure 1 may repeat information already given in some fields of the title block
394 above. Figure 1 in particular needs to define all dimensions intended to be verified by measurements, which generally
395 includes those dimensions to be prescribed in Table 1.
397 Table 1 – Styles and dimensions
f
Dimensions
Style Mass
b c d e
D L d l m
a min
Metric X Y
mm mm mm mg
mm
a
Historical style code, for information only.
b
The body diameter of the resistor D shall be gauged as prescribed in IEC 60294, see IEC 60115-4:2022,
5.3.11.
c
The body length of the resistor L shall be gauged and measured according to IEC 60294, see IEC 60115-
4:2022, 5.3.11 and 5.3.12, respectively.
d
Nominal diameter of the lead wires d, with permissible tolerances according to IEC 60301.
e
The minimum lead length l for products in tape packaging according to IEC 60286-1 applies to the length
min
of the free sections of lead wire between the resistor body and each tape. For untapped resistors it applie s to
the length of each lead wire.
f
For information only.
398 COMMENT 3 See IEC 60115-4:2022, 8.2.2.
399 COMMENT 4 The metric style designation is the normative designation used in all other places throughout this
400 detail specification, see IEC 60115-4:2022, 4.2.1. Column X is an optional column for additional style information,
401 e.g. for traditional alphabetic designations, which generally need to be marked with a respective footnote, e.g. as
402 “Historical style code, for information only”.
403 COMMENT 5 The dimensions for body diameter D, body length L, lead wire diameter d and minimum free lead
404 length l are given as example based on the requirements for axial leaded resistors with cylindrical body and need
min
405 to correspond to the dimensions identified in Figure 1. The choice of prescribed dimensions needs to be adapted to
406 the actual requirements of the drafted detail specification and the shape of products covered therein. The dimensions
407 may be given in the format of nominal values plus tolerance, or by stating permissible minimum and maximum values.
408 Columns for additional dimensions may be inserted as required.
409 COMMENT 6 Column Y represents one or more optional column(s) for the prescription of an additional dimension,
410 e.g. the permissible lead eccentricity and/or the permissible length of excessive coating on the leads, as required.
411 COMMENT 7 The prescribed minimum lead length should take account of the variety of inside tape spacing
412 prescribed as dimension B by IEC 60286-1, plus the permissible window for the lateral resistor body location, given
413 there as dimension K.
414 COMMENT 8 The component mass is not intended to be verified by an inspection procedure. It should be given as
415 the maximum mass of a single component and should be marked with a respective footnote as “For information only”.
416 The wire terminations of the resistor shall emerge concentrically from the end faces of the
417 resistor body, see IEC 60115-4:2022, 4.2.4 with Figure 6. The real eccentricity e, as shown in
418 below Figure 2, shall not exceed the limit given in Table 1. For gauging of the lead eccentricity,
419 the effective eccentricity e’ should be used, see IEC 60115-4:2022, 4.2.4.
IEC CDV 60115-4-20 © IEC:2025
421 Figure 2 – Lead eccentricity of the wire terminations
422 COMMENT 9 The above paragraph and figure are optional and given as an example for the specification of a
423 permissible lead eccentricity. If this specification is used in the drafted detail specification, a suitable method for
424 gauging and/or measuring of the lead eccentricity needs to be described, e.g. in the respective subclauses of Clause
425 5. Alternatively, the deletion of this paragraph and figure will result in the need to update the numbering of subsequent
426 figures accordingly.
427 The resistor shall be properly coated in order to provide a suitable protection against
428 mechanical, electrical and climatic influences, e.g. by means of a conformal lacquer coating. It
429 is typical for such coating to also cover the end faces of the resistor body, which can lead for
430 some amount of excessive coating to spread onto the leads, see IEC 60115-4:2022, 4.2.2 with
431 Figure 4. The length of excessive coating c, as shown in below Figure 3, shall not exceed the
432 limit given in Table 1.
434 Figure 3 – Length of excessive coating on the wire terminations
435 COMMENT 10 The above paragraph and figure are optional and given as an example for the specification of a
436 permissible length of excessive coating on the wire terminations. If this specification is used in the drafted detail
437 specification, a suitable method for gauging and/or measuring of the length of excessive coating needs to be
438 described, e.g. in the respective subclauses of Clause 5. Alternatively, the deletion of this paragraph and figure will
439 result in the need to update the numbering of subsequent figures accordingly.
441 4.3 Ratings
442 The climatic categories applied in this detail specification are given in Table 2.
443 Table 2 – Climatic categories
Climatic category
LCT / UCT / duration
... / ... / ...
... / ... / ...
444 COMMENT 1 See IEC 60115-4:2022, 8.2.3.
445 COMMENT 2 Table 2 may be amended with a column showing the key parameter to which
...
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