1、 EIA STANDARD Fixed Inductors for Electromagnetic Interference Suppression Part 2: Sectional Specification EIA-60938-2 (IEC 60938-2:1999, IDT) July 2014 EIA-60938-2 ANSI/EIA-60938-2-2014 Approved: July 28, 2014 NOTICE EIA Engineering Standards and Publications are designed to serve the public intere
2、st 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 Publicatio
3、ns 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 standar
4、d 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
5、 to parties adopting the Standard or Publication. This EIA Standard is identical (IDT) with the International Standard IEC Publication 60938-2:1999: Fixed Inductors for Electromagnetic Interference Suppression Part 2: Sectional Specification. This document is the EIA Standard EIA-60938-2-2014 Editio
6、n 2.1: Fixed Inductors for Electromagnetic Interference Suppression Part 2: Sectional Specification. The text, figures and tables of IEC 60938-2:1999 are used in this Standard with the consent of the IEC and the American National Standards Institute (ANSI). The IEC copyrighted material has been repr
7、oduced 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
8、 the responsibility 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. 5302, formulated under the cognizance of the Steering Committee for Passive Electronic Compo
9、nents 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 pe
10、rmission 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 Object .
11、3 1.3 Normative references 3 1.4 Information to be given in a detail specification 4 1.5 Definitions . 5 1.6 Marking . 5 2 Preferred ratings and characteristics 5 2.1 Climatic categories 5 2.2 Values of ratings . 6 3 Quality assessment procedures 6 3.1 Primary stage of manufacture 6 3.2 Structurally
12、 similar inductors 6 3.3 Certified records of released lots . 7 3.4 Qualification approval 7 3.5 Quality conformance inspection . 11 4 Test and measurement procedures . 11 4.1 Visual examination and check of dimensions . 11 4.2 Voltage proof . 12 4.3 Insulation resistance 12 4.4 Inductance 13 4.5 DC
13、 line resistance . 13 4.6 Robustness of terminations . 13 4.7 Resistance to soldering heat 13 4.8 Solderability 13 4.9 Rapid change of temperature . 13 4.10 Vibration . 14 4.11 Bump 14 4.12 Shock 15 4.13 Container sealing 15 4.14 Climatic sequence . 15 4.15 Damp heat, steady state 16 4.16 Temperatur
14、e rise (applies only to inductors with a mass 5 g) 16 4.17 Impulse voltage (applies to inductors with more than one winding) . 17 4.18 Endurance . 18 4.19 Passive flammability (if applicable) 19 4.20 Component solvent resistance (if applicable) . 19 4.21 Solvent resistance of marking (if applicable)
15、 19 Annex A (normative) Test schedule for safety tests only approval .20 Annex B (normative) Test schedule for safety tests and performance tests for qualification approval, assessment level D .23 Annex C (normative) Example of a suitable circuit for the endurance test voltage 28 Annex D (normative)
16、 Declaration of design (confidential to the manufacturer and the certification body) .29 Annex E (normative) Test methods for thyristor electromagnetic interference suppression inductors .30 ii Figure C.1 Endurance test circuit .28 Figure E.1 Test circuit for temperature rise 30 Figure E. 2 Test cir
17、cuit for interference voltage attenuation 31 Table 1 Sampling plan for safety tests only . 9 Table 2 Sampling plan for safety tests and performance tests, assessment level D .10 Table 3 Measuring points .12 Table 4 Acceleration 14 Table 5 Sweep cycles 14 Table 6 Preferred severities .15 EIA-60938-2
18、Page 1 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIXED INDUCTORS FOR ELECTROMAGNETIC INTERFERENCE SUPPRESSION Part 2: Sectional specification FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical com
19、mittees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technic
20、al Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmenta
21、l and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agre
22、ements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use
23、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 accurate, 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 promot
24、e international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicat
25、ed 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 conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to
26、 IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
27、 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 references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9)
28、 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 responsible for identifying any or all such patent rights. International Standard IEC 60938-2 has been prepared by IEC technical committee 40: Capacitor
29、s and resistors for electronic equipment. This consolidated version of IEC 60938-2 consists of the second edition (1999) documents 40/1111/FDIS and 40/1137/RVD and its amendment 1 (2006) documents 40/1603/CDV and 40/1700A/RVC. The technical content is therefore identical to the base edition and its
30、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 modified by amendment 1. The QC number that appears on the front cover of this publication is the specification number in the IEC Quality Ass
31、essment System for Electronic Components (IECQ). EIA-60938-2 Page 2 Annexes A, B, C, D and E form an integral part of this standard. The committee has decided that the contents of the base publication and its amendments will remain unchanged until the maintenance result date indicated on the IEC web
32、 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 revised edition, or amended. A bilingual version of this publication may be issued at a later date. EIA-60938-2 Page 3 FIXED INDUCTORS FOR
33、ELECTROMAGNETIC INTERFERENCE SUPPRESSION Part 2: Sectional specification 1 General 1.1 Scope This International Standard applies to fixed inductors designed for electromagnetic interference suppression and which fall within the scope of the generic specification, IEC 60938-1. It is restricted to fix
34、ed inductors for which safety tests are appropriate. This implies that inductors specified according to this specification will either be connected to mains supplies, when compliance with the mandatory tests of table 1 is necessary, or used in other circuit positions where the equipment specificatio
35、n prescribes that some or all of these safety tests are required. This standard applies to fixed inductors which will be connected to an a.c. mains or other supply with a nominal voltage not exceeding 1 000 V a.c. (r.m.s.) or d.c. between conductors and with a nominal frequency not exceeding 400 Hz.
36、 1.2 Object The object of this standard is to prescribe standard requirements for safety tests and standard ratings and characteristics, to select from IEC 60938-1 the appropriate methods of test and to give general performance requirements for suppression inductors. Test severities and performance
37、requirements prescribed in detail specifications referring to this sectional specification shall be of equal or higher performance level. In addition, the minimum require-ments for safety tests specified herein always apply. 1.3 Normative references Les documents de rfrence suivants sont indispensab
38、les pour lapplication du prsent document. Pour les rfrences dates, seule ldition cite sapplique. Pour les rfrences non dates, la dernire dition du document de rfrence sapplique (y compris les ventuels amendements). IEC 60060-1:1989, High-voltage test techniques Part 1: General definitions and test r
39、equirements IEC 60063:1963, Preferred number series for resistors and capacitors Amendment 1 (1967) Amendment 2 (1977) IEC 60085:1984, Thermal evaluation and classification of electrical insulation IEC 60279:1969, Measurement of the winding resistance of an a.c. machine during operation at alternati
40、ve voltage IEC 60938-1:1999, Fixed inductors for electromagnetic interference suppression Part 1: Generic specification ISO 3:1973, Preferred numbers Series of preferred numbers CISPR 16-1-1:2003, Specification for radio disturbance and immunity measuring apparatus and methods Part 1-1: Radio distur
41、bance and immunity measuring apparatus Measuring apparatus EIA-60938-2 Page 4 1.4 Information to be given in a detail specification 1.4.1 General Detail specifications shall be derived from the relevant blank detail specification. Detail specifications shall not specify requirements inferior to thos
42、e of the generic or sectional specification. When more severe requirements are included they shall be listed in 1.8 of the detail specification and indicated in the test schedules, for example by an asterisk. NOTE The information given in 1.4.2 may, for convenience, be presented in tabular form. The
43、 information given in 1.4.2 to 1.4.5 shall be given in each detail specification and the values quoted shall preferably be selected from those given in the appropriate clause of this sectional specification. 1.4.2 Outline drawing and dimensions There shall be an illustration of the inductor as an ai
44、d to easy recognition and for comparison of the inductor with others. Dimensions and their associated tolerances, which affect interchangeability and mounting, shall be indicated upon the drawing. All dimensions shall be stated in millimetres. Normally the numerical values shall be given for the len
45、gth of the body, the width and height of the body or for cylindrical types, the body diameter, and the length and diameter of the terminations. When necessary, for example when a number of items (inductance values/ voltage ranges) are covered by a detail specification, the dimensions and their assoc
46、iated tolerances shall be placed in a table below the drawing. When the configuration is other than described above, the detail specification shall state such dimensional information as will adequately describe the inductor. When the inductor is not designed for use on printed boards, this shall be
47、clearly stated in the detail specification. 1.4.3 Mounting The detail specification shall specify the method of mounting to be recommended for normal use and the method which is mandatory for the application of the vibration, bump and shock tests. The design of the inductor may be such that special
48、mounting fixtures are required in its use. In this case, the detail specification shall describe the mounting fixtures and they shall be used in the application of the bump, shock and vibration tests. The specified heat sink shall be used in the application of the endurance test. 1.4.4 Ratings and c
49、haracteristics The ratings and characteristics shall be in accordance with the relevant clauses of this specification. 1.4.4.1 Additional characteristics may be listed, when they are considered necessary to specify adequately the inductor for design and application purposes. 1.4.5 Marking Deviations from 1.6 of this sectional specification, shall be specifically stated in the detail specification. EIA-60938-2 Page 5 1.5 Definitions For the purpose of this International Standard, the definitions in IEC 60938-1
