1、 EIA STANDARD Fixed Inductors for Electromagnetic Interference Suppression Part 1: Generic Specification EIA-60938-1 (IEC 60938-1:1999, IDT) July 2014 EIA-60938-1 ANSI/EIA-60938-1-2014 Approved: July 28, 2014 NOTICE EIA Engineering Standards and Publications are designed to serve the public interest
2、 through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and Publications
3、 shall not in any respect preclude any member or nonmember of ECIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than ECIA members, whether the standard
4、is to be used either domestically or internationally. Standards and Publications are adopted by ECIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, ECIA does not assume any liability to any patent owner, nor does it assume any obligation whatever t
5、o parties adopting the Standard or Publication. This EIA Standard is identical (IDT) with the International Standard IEC Publication 60938-1:1999: Fixed Inductors for Electromagnetic Interference Suppression Part 1: Generic Specification. This document is the EIA Standard EIA-60938-1-2014 Edition 2.
6、1: Fixed Inductors for Electromagnetic Interference Suppression Part 1: Generic Specification. The text, figures and tables of IEC 60938-1:1999 are used in this Standard with the consent of the IEC and the American National Standards Institute (ANSI). The IEC copyrighted material has been reproduced
7、 with permission from ANSI. The IEC Foreword and Introduction are not part of the requirements of this standard but are included for information purposes only. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the r
8、esponsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. 5301, formulated under the cognizance of the Steering Committee for Passive Electronic Components
9、Standards (S-1). Published by Electronic Components Industry Association 2014 Engineering Department 2214 Rock Hill Road, Suite 265 Herndon, VA 20170 PLEASE! DONT VIOLATE THE LAW! This document is copyrighted by the ECIA and may not be reproduced without permission. Organizations may obtain permissi
10、on to reproduce a limited number of copies through entering into a license agreement. For information, contact: IHS 15 Inverness Way East Englewood, CO 80112-5704 or call USA and Canada (1-877-413-5184), International (303-397-7956) i CONTENTS FOREWORD 1 1 General . 3 1.1 Scope . 3 1.2 Normative ref
11、erences 3 2 Technical data . 5 2.1 Units and symbols . 5 2.2 Definitions . 5 2.3 Preferred values . 8 2.4 Marking . 8 3 Quality assessment procedures 8 3.1 General . 8 3.2 Primary stage of manufacture 8 3.3 Structurally similar inductors . 8 3.4 Qualification approval procedures . 8 3.5 Quality conf
12、ormance inspection . 9 3.6 Alternative test methods 9 3.7 Unchecked parameters . 10 4 Test and measurement procedure 10 4.1 General . 10 4.2 Standard atmospheric conditions . 10 4.3 Drying . 11 4.4 Visual examination and check of dimensions . 11 4.5 Insulation resistance . 13 4.6 Voltage proof 15 4.
13、7 Inductance 18 4.8 Insertion loss 18 4.9 Robustness of terminations . 18 4.10 Resistance to soldering heat . 19 4.11 Solderability (applicable only for terminations intended to be soldered) 20 4.12 Rapid change of temperature 20 4.13 Vibration . 21 4.14 Bump 21 4.15 Shock . 21 4.16 Container sealin
14、g 21 4.17 Climatic sequence . 22 4.18 Damp heat, steady state 23 4.19 Temperature rise . 23 4.20 Endurance 24 4.21 Passive flammability 24 4.22 Active flammability 25 4.23 Solvent resistance of marking 25 4.24 Component solvent resistance . 25 ii Annex A (normative) Interpretation of sampling plans
15、and procedures as described in IEC 60410 for use within the IEC quality assessment system for electronic components (IECQ) . 26 Annex B (normative) Rules for the preparation of detail specifications for capacitors and resistors for electronic equipment 27 Annex C (normative) Requirements for earth i
16、nductors . 28 Figure 1 Voltage proof test circuit 16 Table 1 Reference test: standard atmospheric conditions . 11 Table 2 Creepage distances and clearances 12 Table 3 Measuring voltage . 13 Table 4 Measuring points 14 Table 5 Force 19 Table 6 Torque 19 Table 7 Number of cycles 23 Table 8 Severities
17、and requirements 25 Table C.1 Rated current related to minimum cross-sectional area of copper lead (mm2) of the earth inductor . 28 EIA-60938-1 Page 1 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIXED INDUCTORS FOR ELECTROMAGNETIC INTERFERENCE SUPPRESSION Part 1: Generic specification FOREWORD 1) Th
18、e International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical an
19、d electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical co
20、mmittees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization
21、for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committ
22、ee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is a
23、ccurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and reg
24、ional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conform
25、ity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any
26、personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative
27、 references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsibl
28、e for identifying any or all such patent rights. International Standard IEC 60938-1 has been prepared by IEC technical committee 40: Capacitors and resistors for electronic equipment. This consolidated version of IEC 60938-1 consists of the second edition (1999) documents 40/1110/FDIS and 40/1136/RV
29、D and its amendment 1 (2006) documents 40/1602/CDV and 40/1699A/RVC. The technical content is therefore identical to the base edition and its amendment and has been prepared for user convenience. It bears the edition number 2.1. A vertical line in the margin shows where the base publication has been
30、 modified by amendment 1. The QC number that appears on the front cover of this publication is the specification number in the IEC Quality Assessment System for Electronic Components (IECQ). EIA-60938-1 Page 2 Annexes A, B and C form an integral part of this standard. The committee has decided that
31、the contents of the base publication and its amendments will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a rev
32、ised edition, or amended. A bilingual version of this publication may be issued at a later date. EIA-60938-1 Page 3 FIXED INDUCTORS FOR ELECTROMAGNETIC INTERFERENCE SUPPRESSION Part 1: Generic specification 1 General 1.1 Scope This International Standard applies to inductors designed for electromagn
33、etic interference suppression intended for use within, or associated with, electronic or electrical equipment and machines. It is restricted to inductors for which safety tests are appropriate. The combination of two or more inductors within one enclosure is also included. Inductors within the scope
34、 of this standard may also be used to protect apparatus and machines from electrical noise and voltage or current transients coming from either the supply or from other parts of the apparatus. This standard does not necessarily apply in its entirety to inductors intended for use on motor vehicles, i
35、n aircraft or for marine applications. 1.2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendm
36、ents) applies. IEC 60027 (all parts), Letter symbols to be used in electrical technology IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV) IEC 60062:1992, Marking codes for resistors and capacitors IEC 60068-1:1988, Environmental testing Part 1: General and guidance Amendment 1
37、(1992) IEC 60068-2-1:1990, Environmental testing Part 2: Tests Tests A: Cold Amendment 1 (1993) Amendment 2 (1994) IEC 60068-2-2:1974, Environmental testing Part 2: Tests Tests B: Dry Heat Amendment 1 (1993) Amendment 2 (1994) IEC 60068-2-3:1969, Environmental testing Part 2: Tests Test Ca: Damp hea
38、t, steady state Amendment 1 (1984) IEC 60068-2-6:1995, Environmental testing Part 2: Tests Test Fc: Vibration (sinusoidal) IEC 60068-2-13:1983, Environmental testing Part 2: Tests Test M: Low air pressure EIA-60938-1 Page 4 IEC 60068-2-14:1984, Environmental testing Part 2: Tests Test N: Change of t
39、emperature Amendment 1 (1986) IEC 60068-2-17:1994, Environmental testing Part 2: Tests Test Q: Sealing IEC 60068-2-20:1979, Environmental testing Part 2: Tests Test T: Soldering Amendment 2 (1987) IEC 60068-2-21:1983, Environmental testing Part 2: Tests Test U: Robustness of terminations and integrA
40、mendment 2 (1991) Amendment 3 (1992) IEC 60068-2-27:1987, Environmental testing Part 2: Tests Test Ea and guidance: Shock IEC 60068-2-29:1987, Environmental testing Part 2: Tests Test Eb and guidance: Bump IEC 60068-2-30:1980, Environmental testing Part 2: Tests Test Db and guidance: Damp heat, cycl
41、ic (12 + 12 hour cycle) Amendment 1 (1985) IEC 60068-2-45:1980, Environmental testing Part 2: Tests Test XA and guidance: Immersion in cleaning solvents Amendment 1 (1993) IEC 60294:1969, Measurement of the dimensions of a cylindrical component having two axial terminations IEC 60335-1:1991, Safety
42、of household and similar electrical appliances Part 1: General requirements IEC 60410:1973, Sampling plans and procedures for inspection by attributes IEC 60617 (all parts), Graphical symbols for diagrams IEC 60695-2-2:1991, Fire hazard testing Section 2: Needle-flame test Amendment 1 (1994) CISPR 1
43、7:1981, Methods of measurement of the suppression characteristics of passive radio interference filters and suppression components IEC QC 001002-3:1998, Rules of Procedure of the IEC Quality Assessment System for Electronic Components (IECQ) Part 3: Approval procedures ISO 1000:1992, SI units and re
44、commendations for the use of their multiples and of certain other units EIA-60938-1 Page 5 2 Technical data 2.1 Units and symbols Units, graphical symbols, letter symbols and terminology shall, whenever possible, be taken from the following publications: IEC 60027 IEC 60050 IEC 60617 ISO 1000 When f
45、urther items are required they shall be derived in accordance with the principles of the documents listed above. 2.2 Definitions For the purpose of this International Standard, the following definitions apply. 2.2.1 type a group of components having similar design features and the similarity of whos
46、e manufacturing techniques enables them to be grouped together either for qualification approval or for quality conformance inspection They are generally covered by a single detail specification. NOTE Components described in several detail specifications, may, in some cases, be considered as belongi
47、ng to the same type. 2.2.2 style a sub-division of a type, generally based on dimensional factors. A style may include several variants, generally of a mechanical order 2.2.3 family (of electronic components) a group of electronic components which predominantly displays a particular physical attribu
48、te and/or fulfils a defined function 2.2.4 sub-family (of electronic components) a group of components within a family manufactured by similar technological methods 2.2.5 rated voltage (UR) rated voltage is either the maximum r.m.s. operating voltage of rated frequency or the maximum d.c. operating
49、voltage which may be applied continuously to the terminations of the inductor at any temperature between the lower category temperature and the rated temperature NOTE For inductors with only one winding, the rated voltage should only be applied between one terminal and any conducting surface with which the case is liable to come into contact in normal use. For inductors having more than one winding, the rated voltage may be applied across two individual windings. EIA-60938-1 Pa
