IEC 61332-2005 pdf – Soft ferrite material classification.
1 Scope This International Standard specifies classification rules for soft ferrite materials used in inductive components (inductors and transformers) fulfilling the requirements of the electronic industries. This standard addresses the following purposes 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. The numerical values given in this standard are typical values of parameters (properties) of the related materials. Direct translation from the material specification into the core specification is not always easy or possible. Every detailed material and core specification should be agreed upon between the user and the manufacturer. 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 amendments) applies. IEC 60050-221:1990, International Electrotechnical Vocabulary (IEV) – Chapter 221: Magnetic materials and components IEC 60401-3: 2003, Terms and nomenclature for cores made of magnetically soft ferrites – Part 3: Guidelines on the format of data appearing in manufacturers’ catalogues of transformer and inductor cores
3 Terms and definitions For the purposes of this document, the terms and definitions in Tables 1, 2 and 3 are defined in IEC 60050-221. 4 Classification 4.1 Material classification Soft ferrite materials may be classified by the following basic parameters: – initial permeability and the relevant operation frequency and/or applicable maximum frequency; – initial permeability as a function of the temperature; – applicable maximum flux density and/or amplitude permeability; – power loss at a given frequency, temperature and flux density; – normalized impedance at a given frequency.
4.2 Main classes Soft ferrite materials may be divided into three main classes identified by two letters as follows: – class IS materials are for use at a.c. low flux density as impedances in interference suppression (EMI) applications; – class SP materials are for use at low flux density in signal processing applications; – class PW materials are for use at high flux density (power application). 4.3 Subclasses Each main class is divided into subclasses identified by two letters and a serial number. Ferrite manufacturers’ catalogues may indicate more than one class into which a material grade can fall, where desired. 5 Soft ferrite material classes 5.1 Materials used as impedances in interference suppression applications (IS class) These materials are mainly used in the shape of rods, tubes, beads, wide band chokes, bobbin cores and rings. The relevant subclasses are given in Table 1.