IEC 60384-2:2011

Overview

IEC 60384-2:2011 is an international standard published by the International Electrotechnical Commission (IEC) that specifies requirements for fixed metallized polyethylene terephthalate (PET) film dielectric direct current (d.c.) capacitors used in electronic equipment. These fixed capacitors, characterized by metallized electrodes and PET film dielectrics, are engineered primarily for applications with minimal alternating current (a.c.) components relative to their rated voltage.

The fourth edition of this standard supersedes the 2005 edition and incorporates updated sampling plans, inspection procedures, and preferred voltage values. IEC 60384-2:2011 supports two performance grades - Grade 1 for long-life applications and Grade 2 for general use - and focuses on capacitors with possible self-healing attributes under specific operational conditions. It excludes capacitors designed for electromagnetic interference suppression and surface-mounted types covered by IEC 60384-14 and IEC 60384-19, respectively.

Key Topics

• Scope & Application
  Applicable to fixed d.c. capacitors with metallized electrodes and PET film dielectric, primarily for electronic equipment requiring stable capacitor performance with low a.c. ripple.

• Performance Grades

  • Grade 1: Capacitors designed for long-life applications
  • Grade 2: Capacitors suited for general applications

• Self-Healing Properties
  These capacitors may inherently repair minor electrode damage under certain conditions, improving durability and reliability.

• Preferred Ratings and Characteristics
  The standard defines preferred voltage ratings and capacitor characteristics in alignment with ISO 3 preferred numbers (series R5 and R10), ensuring uniformity and interchangeability.

• Quality Assessment and Testing Procedures
  IEC 60384-2 outlines rigorous test schedules including qualification approval, lot-by-lot, and periodic inspections. Tests cover electrical parameters, mechanical robustness, environmental resistance, and endurance, such as:

  • Visual and dimensional inspections
  • Electrical tests (capacitance, dissipation factor, insulation resistance)
  • Robustness of terminations and solderability
  • Climatic sequencing and rapid temperature changes
  • Vibration, shock, and damp heat testing

• Sampling Plans and Inspection Levels
  Sampling methods and permissible non-conformance levels are updated to reflect a risk-based approach focusing on assessment level EZ, enhancing consistency in quality control.

• Normative References
  The standard references related IEC and ISO standards to support consistent application, including IEC 60384-1 (general fixed capacitor specifications), IEC 60063 (preferred number series), IEC 61193-2 (sampling plans), and ISO 3 (preferred number series).

Applications

IEC 60384-2 compliant metallized PET film capacitors are widely used in:

• Electronic Equipment
  Ensuring reliable direct current filtering, energy storage, and signal processing where a.c. ripple is limited.

• Long-Life Industrial Systems
  Grade 1 capacitors withstand demanding conditions for extended service life, ideal for critical electronic circuits.

• General-Purpose Consumer Electronics
  Grade 2 capacitors provide cost-effective, standard performance suitable for everyday devices.

• Power Supply Units
  Capacitors that maintain stable capacitance and low loss, contributing to efficient power conditioning.

• Control and Instrumentation
  Components requiring stable dielectric properties and mechanical robustness under varying environmental stresses.

Related Standards

• IEC 60384-1:2008 – General specification covering fixed capacitors used in electronic equipment; IEC 60384-2 builds on these general principles and adapts them for metallized PET film dielectric d.c. capacitors.

• IEC 60384-14 – Specifies fixed capacitors for electromagnetic interference (EMI) suppression, a different capacitor category not covered by IEC 60384-2.

• IEC 60384-19 – Concerns surface mount fixed metallized PET film dielectric d.c. capacitors, distinguished by mounting technology.

• IEC 60063 – Defines preferred number series for resistors and capacitors, essential for standardized rated voltage values and other electrical characteristics.

• IEC 61193-2 – Provides guidance on selecting sampling plans for inspection, relevant to quality assurance in capacitors servicing electronic equipment.

Practical Value

By adhering to IEC 60384-2:2011, manufacturers and users of fixed metallized PET film d.c. capacitors benefit from:

• Assured component reliability suited to application-specific needs, particularly for low a.c. ripple environments.
• Standardized test procedures that validate durability, electrical performance, and environmental resilience.
• Simplified design and sourcing through aligned rated voltages and preferred characteristics consistent with international norms.
• Enhanced confidence in self-healing capacitor technology, increasing lifespan and reducing maintenance.
• Clear quality assessment frameworks facilitating consistent production quality and compliance verification.

This standard is fundamental for engineers, designers, and quality professionals involved in the development, selection, and utilization of fixed capacitors in the electronics industry. It ensures that capacitor components meet rigorous technical and safety criteria, support international interoperability, and promote technological advancement.