IEC 61332:2016

Overview

IEC 61332:2016 - Soft ferrite material classification defines standardized classification rules for soft ferrite materials used in inductive components such as inductors and transformers in the electronic industries. The standard helps suppliers and users compare materials, understand catalogue data, select appropriate ferrites for specific applications, and use uniform nomenclature and benchmarks for new material development.

Key topics

• Material cross-referencing: Provides rules to cross-reference ferrite grades from multiple suppliers to enable direct comparison.
• Catalogue-data interpretation: Guidance to customers for understanding and comparing published technical data (losses, permeability, etc.) in supplier catalogues.
• Material selection guidance: Recommendations to help designers and purchasers choose the most applicable ferrite material for a given inductive component or operating condition.
• Nomenclature and benchmarks: Establishes consistent naming conventions for IEC ferrite-related standards and uniform performance benchmarks to guide suppliers during new material development.
• Edition changes (significant technical updates in 2016):
  • Deleted the "c" rank from a subclass in Table 3 because of excessive power loss density.
  • Added an "a-wide" rank in subclasses PW3, PW4 and PW5 in Table 3.
  • Changed the B level for PW3 class from 100 mT to 200 mT; corresponding B × f and power loss density values were updated.
  • Changed the B level for PW4 class from 50 mT to 100 mT; corresponding B × f and power loss density values were updated.

Note: B refers to magnetic flux density and B × f to the product of flux density and frequency - parameters used to characterize ferrite loss behavior.

Applications

IEC 61332:2016 is practical for:

• Design and specification of inductors and transformers for power electronics, signal processing, and general-purpose electronics.
• Comparing ferrite materials for efficiency-sensitive or thermal-limited applications (e.g., switching power supplies, EMI suppression).
• Developing supplier catalogues and data sheets with standardized, comparable technical information.
• R&D and qualification of new soft ferrite materials where uniform performance benchmarks are required.

Who should use it

• Ferrite material suppliers (catalogue standardization, benchmarking)
• Component manufacturers (inductor/transformer designers)
• Electronics design engineers and procurement specialists (material selection)
• Test labs and standards committees (nomenclature and conformity assessment)

Related standards

Refer to other IEC standards and technical reports addressing ferrite characterization, magnetic material testing, and inductive component design for complementary guidance on measurement methods and component specifications.