Overview
IEC TS 62647-3:2014 is a technical specification developed by the International Electrotechnical Commission (IEC) as part of the IEC 62647 series. The document establishes performance testing procedures for aerospace and defence electronic systems utilizing lead-free solder and finishes. With the global transition towards lead-free electronics due to environmental and regulatory pressure, especially from the EU Restriction of Hazardous Substances (RoHS) directive, ensuring the reliability and performance of such systems has become crucial for avionics and high-reliability defense applications.
This standard provides both a default test method for organizations lacking resources to develop customized testing and a protocol allowing experienced manufacturers to tailor performance testing to their products and operational requirements. The aim is to assist suppliers in meeting reliability and performance requirements aligned with IEC/TS 62647-1 and IEC/TS 62647-21, supporting quality assurance throughout the supply chain.
Key Topics
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Default Performance Testing Method:
- For companies needing a pre-defined, conservative approach, the standard outlines a method to assess reliability, qualification, and performance when transitioning to or deploying lead-free solder in electronic circuit card assemblies (CCAs).
- Ensures risk minimization, emphasizing conservative benchmarks to protect avionics and defense users.
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Flexible Protocol for Custom Test Design:
- Organizations with adequate expertise and resources may develop their own performance test methods, provided they robustly characterize the materials, assembly attributes, and application scenarios.
- The protocol section details how to document test vehicles, select appropriate test parameters, and interpret data.
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Preconditioning and Environmental Simulation:
- Performance testing often begins with preconditioning, such as thermal aging, to simulate the material changes that occur over a product lifecycle.
- Environmental test procedures described include thermal cycling, vibration, mechanical shock, and testing under combined environments, closely mirroring real-world aerospace and military conditions.
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Failure Analysis and Life Projection:
- Focuses on identifying failure mechanisms, specifically solder joint fatigue, which is a primary mode of failure in aerospace and defense electronics.
- Accurate failure mode identification empowers reliability assessments and life projection efforts.
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Documentation and Stakeholder Involvement:
- Emphasizes thorough documentation of test vehicle attributes, assembly processes, and sample size determination based on statistical principles.
- Suggests stakeholder concurrence for reliability, verification, or qualification test results.
Applications
IEC TS 62647-3:2014 is intended for use by:
- Aerospace and Defence OEMs and Suppliers managing CCAs with lead-free solder, either in newly designed products or legacy systems in transition from tin-lead to lead-free assemblies.
- Repair and Maintenance Facilities responsible for servicing equipment where full product history or custom test methods may not be available.
- High Performance Electronics Sectors (e.g., avionics, military, space) that contend with harsh environments, long service lifetimes, and where failure consequences are severe.
- Quality Assurance and Reliability Teams who require structured, approved methods to validate solder joint performance, understand potential failure mechanisms, and ensure compliance with contractual and legal requirements.
This standard assists organizations at every stage of the transition to lead-free solder, from products re-qualified for lead-free use to new designs and mixed-technology assemblies.
Related Standards
- IEC/TS 62647-1: Process management for avionics - Overview and requirements.
- IEC/TS 62647-21 and IEC/TS 62647-22: Further technical guidelines and implementation considerations for lead-free electronic systems in aerospace and defense.
- IPC-9701A: Performance Test Methods and Qualification Requirements for Surface Mount Solder Attachments.
- IPC-SM-785: Guidelines for Accelerated Reliability Testing of Surface Mount Solder Attachments.
- JESD22-B110A: Mechanical shock testing for electronic subassemblies.
- MIL-STD-810G: Environmental engineering considerations and laboratory tests for military equipment.
By aligning with IEC TS 62647-3:2014, organizations ensure they meet best practice guidelines for managing the reliability of lead-free soldered electronic assemblies in mission-critical aerospace and defense systems.