IEC TS 63337:2024 PDF

Overview

IEC TS 63337:2024 - Basic qualification of DC-link film capacitors for automotive use specifies general requirements, test conditions and tests to validate the electrical, mechanical and environmental characteristics - including service life - of customized DC‑link film capacitors intended for motor‑vehicle power electronics. The technical specification applies to capacitors used as DC‑link components in HV applications and in the intermediate circuit of the 48 V on‑board electrical system. Standard DC‑link capacitors already qualified under other IEC standards or AEC‑Q200 are explicitly excluded.

Key topics and requirements

• Scope and exclusions: Focus on customized film capacitors for automotive power electronics; not a replacement for full component‑level vehicle tests or AEC‑Q200-qualified parts.
• Electrical characterisation: Capacitance, insulation resistance, ESR (equivalent series resistance), ESL (equivalent series inductance) and external insulation checks.
• Mechanical characterisation: Geometry, visual inspection and dimensional checks.
• Environmental and exposure tests: Thermal shock, damp heat (steady state), high‑temperature load (overload and operating life), vibration, charge/discharge cycles and short‑circuit testing.
• Service life and qualification: Methods to assess lifetime behaviour under specified electrical and thermal stresses; sampling, parameter tests and acceptance criteria.
• Test sequencing & documentation: Test sequence diagrams, required measurements, and reporting guidance; annexes include example data sheet and rules for qualification after design changes.
• Limitations: No tests in this TS validate the thermal interface between capacitors, power electronics and the cooling system at the component level.
• Flexibility for innovation: Qualification requirements can be expanded or adapted for technologically innovative designs; supplements must be agreed and documented between stakeholders prior to sourcing.

Applications and practical value

• Ensures consistent qualification and reliability of DC‑link film capacitors used in automotive inverters, converters and power electronics modules.
• Useful for:
  • Capacitor manufacturers preparing automotive product qualifications
  • Automotive OEMs and Tier‑1 suppliers specifying capacitor acceptance criteria
  • Test laboratories performing component qualification and lifetime testing
  • Design and reliability engineers validating DC‑link performance in HV and 48 V systems
• Helps reduce field failures, guide supplier selection, and provide repeatable test evidence for procurement and compliance.

Related standards

• AEC‑Q200 (automotive electronic components) - parts qualified under AEC‑Q200 are outside this TS’s scope.
• Other IEC standards for capacitors (general IEC publications) - IEC TS 63337 complements but does not replace component‑level or vehicle manufacturer environmental qualification standards.

Keywords: IEC TS 63337:2024, DC-link film capacitors, automotive qualification, HV applications, 48 V system, capacitor service life, AEC‑Q200, power electronics testing.