MT 1 - TC 51/MT 1

IEC 60205:2016 specifies uniform rules for the calculation of the effective parameters of closed circuits of ferromagnetic material. This edition includes the following significant technical changes with respect to the previous edition:
a) addition, in 5.1, of the drawing of a core of rectangular cross-section with chamfer;
b) addition, in 5.1.3, of the equation of a core of rectangular cross-section with chamfer;
c) equations in 5.1.4, 5.6, 5.7, 5.8, 5.9, 5.11, 5.12, 5.14 are amended or replaced;
d) drawings RM6-S and RM6-R in 5.7 are amended;
e) addition of EC-cores, see 5.15.
The contents of the corrigendum of July 2018 have been included in this copy.

IEC 61332:2016 specifies classification rules for soft ferrite materials used in inductive components (inductors and transformers) fulfilling the requirements of the electronic industries. This document addresses the following issues for ferrite suppliers and users:
- cross-reference between materials from multiple suppliers;
- assistance to customers in understanding the published technical data in catalogues when comparing multiple suppliers;
- guidance to customers in selecting the most applicable material for each application;
- setting of nomenclature for IEC standards relating to ferrite;
- establishing uniform benchmarks for suppliers for performance in new development of materials.
This edition includes the following significant technical changes with respect to the previous edition:
a) deleted "c" rank from subclass from Table 3, because of too large power loss density;
b) added "a-wide" rank in subclasses PW3, PW4 and PW5 in Table 3;
c) changed "B" of PW3 class from 100 mT to 200 mT; "B x f" and "power loss density" have also been changed;
d) changed "B" of PW4 class from 50 mT to 100 mT; "B x f" and "power loss density" have also been changed.

IEC 60401-3:2015 gives guidelines for a uniform method of presentation for the properties of magnetically soft ferrite materials and measuring conditions under which they should be determined. It is intended for use in manufacturers' catalogues of transformer and inductor cores, in order to aid the comparability of such data. Additional guidance is given for users and manufacturers concerning testing and specification of reliability for ferrite cores and for devices using ferrite cores. This edition includes the following significant technical changes with respect to the previous edition:
- addition of reliability in Clause 6.

IEC 62358:2012 provides standard AL values (inductance factors) and their tolerances of Pot, RM, ETD, E, EER, EP, PQ and low-profile gapped ferrite cores. This edition includes the following significant technical changes with respect to the previous editions:
a) addition of AL value (inductance factor) and its tolerance for PQ-cores;
b) addition of AL value (inductance factor) and its tolerance for EFD-cores;
c) addition of AL value (inductance factor) and its tolerance for Low-profile ER-I-cores;
d) addition of AL value (inductance factor) and its tolerance for Low-profile ER-cores (ER9,5 x 2,5 x 5, ER11 x 2,5 x 6, ER14,5 x 3 x 7 ferrite cores are same as the previous edition);
e) addition of AL value (inductance factor) and its tolerance for Low-profile PQ-I-cores.

IEC 60205:2006 lays down uniform rules for the calculation of the effective parameters of closed circuits of ferromagnetic material.

Specifies requirements for audiometric equipment designed for use in pure tone audiometry in the frequency range from 8 000 Hz to 16 000 Hz, in addition to those that are applicable and specified in IEC 645-1.

Specifies classification rules for soft ferrite materials used in inductive components (inductors and transformers) fulfilling the requirements of the electronic industries. Provides cross-reference between materials from multiple suppliers; assistance to customers in understanding the published technical data in catalogues when comparing multiple suppliers; guidance to customers in selecting the most applicable material for each application; nomenclature for IEC standards relating to ferrites.

Defines the terms, definitions, symbols, quality system, test, assessment and verification methods and other requirements relevant to the design, manufacture and supply of ferrite cores in compliance with the general requirements of the IECQ-CECC System for components of assessed quality.

IEC 60424-1:2015 gives guidelines on the allowable limits of surface irregularities of ferrite cores. This standard should be considered as a general specification useful in the dialogue between ferrite core manufacturers and customers about surface irregularities. This edition includes the following significant technical changes with respect to the previous edition:
- addition of pores in 3.5 and crystallites in 3.6.

IEC 60424-4:2015 gives guidance on allowable limits of surface irregularities applicable to ring-cores in accordance with the relevant generic specification defined in IEC 60424-1. This standard is considered as a sectional specification useful in the negotiations between ferrite core manufacturers and customers about surface irregularities. This edition includes the following significant technical changes with respect to the previous edition:
- addition of crystallites in 3.1.3 and of pores in 3.1.4.

IEC 62317-6:2015 specifies the dimensions that are of importance for mechanical interchangeability for ETD-cores made of ferrite, the essential dimensions of coil formers to be used with them, and the effective parameter values to be used in calculations involving them. This first edition cancels and replaces the second edition of IEC 61185 published in 2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Changed dimension A of ETD 54 core.

IEC 60424-2:2015 provides guidelines on the allowable limits of surface irregularities applicable to RM-cores in accordance with the relevant generic specification. This standard should be considered as a sectional specification useful in the negotiations between ferrite core manufacturers and customers about surface irregularities. Normative reference. This edition includes the following significant technical changes with respect to the previous edition:
- addition of crystallites in 3.6 and of pores in 3.7.

IEC 62317-11:2015 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EC-cores, the essential dimensions of coil formers to be used with them, and the effective parameter values to be used in calculations involving them. This first edition cancels and replaces the first edition of IEC 60647 published in 1979. This edition constitutes a technical revision and includes the following significant technical changes with respect to the first edition of IEC 60647:
- addition of EC90 and EC120 cores in Table 1,
- addition of effective parameter and Amin values and main dimensions of coil formers for EC90 and EC120 cores.

IEC 60424-3:2015 gives guidelines on allowable limits of surface irregularities applicable to ETD-cores, EER-cores, EC-cores and E-cores in accordance with the relevant general specification. This standard is a specification useful in the negotiations between ferrite core manufacturers and customers about surface irregularities. This edition includes the following significant technical changes with respect to the previous edition:
a) addition of allowable areas of chips for EC-cores in Table 3,
b) addition of crystallites in 4.5 and pores in 4.6.

IEC 62317-5:2015 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EP-cores, the essential dimensions of coil formers to be used with these cores and the locations of their terminal pins on a 2,50 mm printed wiring grid in relation to the base outlines of the cores, and the effective parameter values to be used in calculations involving them. This first edition cancels and replaces the first edition of IEC 61596 published in 1995. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 61596:
a) addition of EP5-core in Table 1,
b) addition of effective parameter and Amin values, main dimensions of coil formers, and pin locations and base outlines for EP5-core.

IEC 62317-2:2010 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of pot-cores made of ferrite, and the dimensional limits for coil formers to be used with them. The selection of core sizes for this standard is based on the philosophy of including those sizes which are industrial standards, either by inclusion in a national standard, or by broad-based use in industry. See IEC 62317-1 for more detail concerning the philosophy of selecting core sizes to be included. This first edition cancels and replaces the fourth edition of IEC 60133 published in 2000. The main changes with respect to the previous edition of IEC 60133 are listed below:
- changed "e dimension" of P4,6/3,1 in Table 6 from 3,20 Max. to 3,40 Max.;
- removed "derived standards" from Annex B (informative) in the fourth edition of IEC 60133;
- changed the name of core parts in Subclause 3.1.2 from "Grooves" to "Wire-ways" in accordance with IEC 62317-1 Subclause 5.6.

IEC 60401-2:2009 presents a method for defining the designation nomenclature for the major physical attributes of soft ferrite core shapes. The purpose of this standard is to facilitate uniform usage of dimensional characters by manufacturers, specifiers, and users when describing core dimensions on drawings, in tables, and on catalogue specification sheets. This edition includes the following significant technical changes with respect to the previous edition: New ferrite core shapes "half pot core for inductive proximity switches and PM core" in accordance with IEC 62317 series have been added respectively as Figure 13 and Figure 14 in Clause 5: core illustrations.

Specifies the dimensions that are of importance for mechanical interchangeability for E-cores with rectangular cross-section made of ferrite, the dimensions of coil formers to be used with them, and the effective parameter values to be used in associated calculations.

IEC 62317-4:2005 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of RM-cores and low-profile RM-cores made of ferrite, and the locations of their terminal pins on a 2,54 mm printed wiring grid in relation to the base outlines of the cores. It also specifies the test conditions and clamping forces to be used for inductance measurement. This international standard cancels and replaces the second edition of IEC 60431 published in 1983, its amendment 1 (1995), and its amendment 2 (1996). This international standard constitutes a technical revision of IEC 60431. The contents of the corrigendum of July 2016 have been included in this copy.

Specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EER-cores made of ferrite, the essential dimensions of coil formers to be used with them, and the effective parameter values to be used in calculations involving them.

IEC 61185:2005 specifies the dimensions that are of importance for mechanical interchangeability for ETD-cores made of ferrite, the essential dimensions of coil formers to be used with them, and the effective parameter values to be used in calculations involving them.