Overview
IEC 62137-3:2011 titled Electronics assembly technology - Part 3: Selection guidance of environmental and endurance test methods for solder joints is an international standard developed by the International Electrotechnical Commission (IEC). It provides a comprehensive methodology for selecting appropriate environmental and endurance test methods to evaluate the reliability of solder joints in electronic assemblies. This standard covers solder joints for a variety of device types including surface mount devices (SMD), array type devices, leaded devices, and lead insertion type devices, utilizing various solder alloy materials.
This edition of IEC 62137-3 cancels and replaces the previous IEC/PAS 62137-3:2008, introducing editorial improvements with no technical changes. It serves as a vital resource to ensure consistent and reproducible reliability testing of solder joints under environmental stress, helping manufacturers and testing laboratories maintain high quality in electronic assembly technologies.
Key Topics
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Selection Methodology for Test Methods
The standard outlines a step-by-step procedure to select suitable environmental and endurance test methods based on the shape, type, and solder alloy of the device. This includes consideration of field stresses and device terminations.
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Test Methods for Various Devices
Detailed frameworks are provided for test selection across different device types:
- Surface Mount Devices (SMD)
- Lead Insertion Type Devices
- Array Types and Leaded Devices
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Environmental Stress Factors
It emphasizes the impact of rapid temperature changes, dry heat, and damp heat conditions on solder joint reliability, detailing specific test conditions appropriate for different solder alloys.
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Mechanical and Endurance Tests
Descriptions and guidance on numerous mechanical strength tests such as:
- Pull strength and shear strength tests
- Torque shear strength and monotonic bending strength tests
- Cyclic bending fatigue, mechanical shear fatigue, and cyclic drop tests
- Specialized tests for lead insertion devices including creep strength evaluations
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Soldering and Mounting Conditions
The standard includes recommendations regarding soldering methods like reflow and wave soldering as well as mounting techniques to ensure consistent test conditions.
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Evaluation Criteria
Clear guidelines are presented for selecting test parameters and interpreting results to assess solder joint quality accurately.
Applications
IEC 62137-3:2011 provides practical value to electronics manufacturers, quality assurance teams, and testing labs by enabling:
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Reliability Testing of Solder Joints
Ensures solder joints meet durability requirements under environmental stresses, enhancing product lifespan and reducing failure rates.
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Design Validation and Process Control
Helps engineers select appropriate tests during design verification and manufacturing process development to validate solder joint integrity.
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Standardized Test Protocols
Establishes uniformity in testing procedures across different organizations and regions, facilitating global compliance and product interoperability.
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Material and Device Compatibility Assessment
Guides the choice of environmental tests based on the solder alloy composition and device configuration, promoting optimal material-device compatibility.
This standard is especially relevant in sectors such as consumer electronics, automotive, aerospace, industrial equipment, and telecommunications where reliable electronics performance is critical.
Related Standards
To complement IEC 62137-3:2011, professionals should consider these related IEC standards and resources:
- IEC 60068 Series – Environmental testing methods for electronic components and systems
- IEC 61191 Series – Flexible printed boards and soldering quality requirements
- IEC 61010 – Safety requirements for electrical equipment used in measurement and testing
- Electropedia – IEC’s online dictionary for electronic and electrotechnical terms, useful for terminology clarification
- IEC 62137 Parts 1 & 2 – Other parts of the series covering different aspects of electronics assembly technology and solder joint testing
Using IEC 62137-3 in coordination with these standards ensures a holistic approach to electronics assembly reliability and conformity to international best practices.
Keywords: IEC 62137-3, solder joint testing, electronics assembly, environmental test methods, endurance testing, reliability tests, surface mount devices, lead insertion devices, solder alloys, electronic component reliability, IEC standards, electronics manufacturing testing.