Overview
IEC 62435-4:2018 - "Electronic components - Long-term storage of electronic semiconductor devices - Part 4: Storage" is an international standard that defines methods and recommended conditions for the long-term storage (LTS) of electronic components and semiconductor devices. Long-term storage in this standard refers to durations that may exceed 12 months for products planned for extended shelf life. The standard covers facility design, logistics, security, storage philosophy, and good working practices to minimize degradation risks such as moisture, outgassing, UV, temperature excursions and electrostatic damage.
Key topics and technical focus
The standard addresses practical technical topics and requirements, including:
- Storage environment and facility controls: guidance on ambient environment selection, location, security and cost-of-ownership considerations for LTS facilities.
- Storage methods: recommended approaches such as dry cabinets, moisture barrier bag (MBB) storage, controlled atmospheres (dry nitrogen or high-purity dry air), oxygen-controlled or outgassing-controlled regimes.
- Packaging and materials: use and selection of desiccants, humidity indicator cards (HIC), moisture barrier bags, storage containers, cushioning foams and other packing materials.
- Identification and traceability: labelling, storage identification and records to maintain lot history and retrieval control.
- Maintenance and monitoring: procedures for maintaining storage conditions, periodic checks, and tests to verify continued suitability for use.
- Removal and handling: precautions on de-storage, electrostatic discharge (ESD) protection and requalification steps after extended storage.
- Redundancy and risk mitigation: double-containment strategies and recommended checklists (Annex A) for LTS facilities.
Practical applications and who uses this standard
IEC 62435-4 is used by organizations that need to preserve electronic parts for years rather than months. Typical users include:
- OEMs and contract manufacturers conducting lifetime buys for long-lived systems
- Aerospace, defense, railway and energy industries managing spares for multi-decade equipment
- Maintenance, repair and overhaul (MRO) centers and repair agencies
- Semiconductor suppliers, distributors and specialized long-term storage providers
- Asset managers and procurement teams responsible for obsolescence mitigation
Applying IEC 62435-4 helps organizations reduce degradation risks, maintain solderability and functional reliability after storage, and document storage practices for audits and traceability.
Related standards
- IEC 62435 series - other parts address related long-term storage topics.
- IEC TR 62258-3 - covers moisture-sensitive device storage for shorter durations.
Using IEC 62435-4 supports robust long-term storage programs for electronic components, enabling better obsolescence management and safer long-duration inventory strategies.