IEC 60938-1:2021

Overview

IEC 60938-1:2021 is the International Electrotechnical Commission's (IEC) global standard that specifies generic requirements for fixed inductors designed to suppress electromagnetic interference (EMI) in all types of electrical and electronic equipment. This third edition updates and replaces the 1999 version, reflecting technological advancements and improved testing methodologies. It defines terms, general requirements, normative references, and detailed test procedures essential to ensure reliability, performance, and safety of EMI suppression inductors.

This standard is critical for manufacturers, designers, and quality assurance professionals working with fixed inductors for EMI mitigation. It establishes a harmonized framework to classify, test, and verify fixed inductors to effectively reduce electromagnetic noise, contributing to robust and compliant electronic devices.

Key Topics

• Scope and Application
  IEC 60938-1:2021 applies to fixed inductors used to suppress electromagnetic interference within all kinds of electrical and electronic equipment. It serves as a generic specification supplementing sectional specifications with detailed requirements like creepage distances and clearance values defined separately.

• General Requirements
  The standard covers preferred values for ratings including inductance and current, temperature derating considerations, marking, and insulation specifics. It stipulates information required in detail specifications such as outline drawings, mounting methods, and performance characteristics.

• Test and Measurement Procedures
  A comprehensive suite of tests is prescribed for assessing fixed inductors, including but not limited to:

  • Visual examination and inspection
  • Insulation resistance and AC voltage withstand tests
  • Inductance and resistance measurements
  • Insertion loss and temperature rise tests
  • Endurance, shock, vibration, and solderability assessments
  • Climatic tests such as damp heat and rapid temperature changes
  • Special tests for earth inductors as per Annex B

• Technical Updates
  Key technical enhancements since the previous edition include:

  • Addition of material tests to verify component reliability
  • Clear separation between generic test descriptions and sectional specification requirements
  • Relocation of creepage and clearance criteria exclusively to sectional documents
  • Introduction of AC voltage testing in the voltage test procedures

Applications

IEC 60938-1:2021 benefits various sectors where EMI suppression is vital to ensure safe and efficient operation of electronic systems, including:

• Consumer electronics
• Industrial control systems
• Telecommunications equipment
• Medical devices
• Automotive electronic modules
• Power supplies and energy management systems

Applying this standard guarantees that EMI suppression inductors can consistently meet operational requirements under diverse conditions, enhancing device immunity to electromagnetic noise and reducing susceptibility to interference. It also aids compliance with broader EMC (Electromagnetic Compatibility) regulations globally.

Related Standards

IEC 60938-1:2021 forms part of the IEC 60938 series which covers fixed inductors for EMI suppression. Other relevant standards to consider alongside include:

• Sectional specifications within the IEC 60938 series which detail application-specific requirements such as creepage distances, clearance, and environmental conditions.
• IEC 61000 series standards on Electromagnetic Compatibility (EMC) for test methods and limits concerning conducted and radiated disturbances.
• IEC 60068 series for environmental testing that complement climatic and mechanical endurance tests applied to fixed inductors.

Together, these standards provide a comprehensive framework to design, test, and certify inductors that meet international safety and performance criteria.

Keywords: IEC 60938-1, fixed inductors, electromagnetic interference suppression, EMI filters, electronic equipment standards, inductance testing, voltage test AC, insulation resistance, EMI mitigation, electromagnetic compatibility, IEC standards.