Overview
IEC 62435-7:2020 is an international standard developed by the International Electrotechnical Commission (IEC) that focuses on the long-term storage of micro-electromechanical systems (MEMS) devices. This part of the IEC 62435 series provides guidelines specifically for the storage of MEMS semiconductor devices intended to remain viable after extended storage periods exceeding 12 months.
The standard addresses fundamental principles, best practices, and environmental controls necessary for effective storage. It is particularly relevant for industries facing component obsolescence challenges, such as aerospace, railway, and energy sectors, where equipment lifecycles may span several decades. IEC 62435-7 supports obsolescence mitigation strategies by providing a structured approach to preserve MEMS device functionality during extended storage durations.
Key Topics
- Scope & Applicability: Covers storage requirements for micro-electromechanical devices used in electronic semiconductor applications, including unpackaged and packaged MEMS components.
- Failure Mechanisms: Identification of common failure causes during storage, such as moisture ingress, electrostatic discharge, temperature extremes, UV exposure, and contamination.
- Storage Environment: Specifies ideal conditions to minimize degradation, including temperature, humidity control, use of moisture barrier bags, desiccants, and dry packing techniques.
- Materials & Handling: Best practices for materials management, inventory control, and documentation to ensure traceability and maintain component integrity.
- Moisture Sensitivity Designation: Guidance for classifying MEMS devices per their sensitivity to moisture and methods for tailored storage solutions.
- Inventory Maintenance: Recommendations for periodic inspection, moisture indicator cards, refreshing dry packing, and reassessing stored components over time.
- Packaging Considerations: Emphasizes use of barrier materials, labelling, and proper dunnage to protect devices within storage media.
Applications
IEC 62435-7:2020 is highly valuable for organizations and professionals involved in:
- Obsolescence Management: Industries where components become unavailable but must be preserved for long-term support and repair.
- Lifetime Buys and Spare Parts Storage: Managing large quantities of MEMS devices purchased for future production runs or warranties with prolonged shelf lives.
- Quality Assurance: Ensuring that MEMS devices retain their original electronic and mechanical functionality after storage.
- Supply Chain Management: Standardizing storage procedures to reduce risks associated with environmental exposure and handling.
- Reliability Engineering: Mitigating degradation factors by adhering to recognized storage standards to maintain device performance and extend product lifecycle.
This standard helps minimize economic risk by maintaining device reliability, preventing operational failures, and supporting continuity in manufacturing and maintenance processes.
Related Standards
IEC 62435-7:2020 forms part of the IEC 62435 series, which addresses long-term storage of electronic semiconductor devices. Other parts focus on different device types such as discrete semiconductors, integrated circuits, and optoelectronic components.
For comprehensive storage protocol development, users often consult:
- IEC 62435-1: General long-term storage requirements for electronic components.
- IEC 60749: Semiconductor device reliability testing and guidance.
- JEDEC Standards: Moisture sensitivity practices and packaging standards.
- ISO/IEC Directives: Standard development and conformity assessment processes.
Integration of IEC 62435-7 with complementary standards supports harmonized global practices in electronic component preservation.
By adopting IEC 62435-7:2020, manufacturers, storage facilities, and users of MEMS devices can confidently implement proven long-term storage methods aligned with international best practices, limiting degradation risks and extending device service life. This standard plays a crucial role in sustaining electronic system integrity amidst evolving technology landscapes and supply chain complexities.