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This specification deals with soft magnetic manganese zinc ferrite core materials for high frequency power transformer and filter inductor applications. The size of this soft magnetic manganese zinc ferrite power transformer core is often constrained by the core loss and saturation flux density while the size of filter inductor core is constrained by the inductance index, which is dependent on the material permeability. The typical material constants for tensile strength, coefficient of linear expansion, compressive strength, and density are given.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers the requirements to which the specified grades of soft magnetic manganese zinc (MnZn) ferrite materials shall conform. Cores made from these materials are used primarily in transformers and inductors.
1.2 Frequency—MnZn ferrite cores are primarily used for frequencies in the range of 10 kHz to 1 MHz. Many inductors have a DC component as well.
1.3 Magnetic Flux Density—Applications consist of two main categories, high and low magnetic flux density.
1.3.1 High Magnetic Flux Density—Transformers used for power conversion. Inductors or chokes used in high current applications.
1.3.2 Low Magnetic Flux Density—Transformers, inductors, chokes used for signal conditioning.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to customary (cgs-emu and inch-pound) units, which are provided for information only and are not considered standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A1013 Test Method for High-Frequency (10 kHz-1 MHz) Core Loss of Soft Magnetic Core Components at Controlled Temperatures Using the Voltmeter-Ammeter-Wattmeter Method
ICS Number Code 29.100.10 (Magnetic components)
UNSPSC Code 31380000(Magnets and magnetic materials)
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ASTM A1009-18, Standard Specification for Soft Magnetic MnZn Ferrite Core Materials for Transformer and Inductor Applications, ASTM International, West Conshohocken, PA, 2018, www.astm.orgBack to Top