IEC 61188-6-3:2024

Overview

IEC 61188-6-3:2024 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies requirements for the design of land patterns and lands on circuit boards specifically for mounting through hole technology (THT) components. This standard addresses the dimensioning and description of soldering surfaces on printed circuit boards (PCBs), aiming to ensure robust and reliable solder joints in line with the soldering requirements set out in IEC 61191-1 and IEC 61191-3.

As the electronics industry continues to evolve, IEC 61188-6-3:2024 provides updated guidelines that reflect advancements in component design, assembly techniques, and PCB manufacturing processes. The main focus is achieving manufacturability and reliability when designing land patterns for through hole components, considering the requirements and realities of both manual and automated assembly.

Key Topics

• Land Pattern Requirements: Defines how to design the shape and dimensions of lands (pads) and holes on PCBs for components with leads, ensuring compatibility with various soldering methods.
• Padstack Definition: Describes the composition and structure of padstacks, including the configuration of layers, pads, holes, and relevant attributes such as annular rings.
• Soldering Surfaces: Provides guidance on designing solderable hole patterns, including plated through holes, to support reliable electrical connections.
• Component Lead Types: Addresses common lead profiles such as round, square, and rectangular and how these affect land and hole design.
• Annular Ring Calculation: Establishes proportional relationships between lead size and annular ring dimensions to optimize solder joint strength and reliability.
• Manufacturing Considerations: Discusses the impact of different hole creation techniques (drilling, milling, punching, additive methods) on land pattern design.
• Assembly Process Adaptation: Integrates considerations for both manual and automated assembly processes, ensuring the land pattern accommodates typical tolerances, assembly methods, and soldering conditions.
• Thermal Management: Highlights the role of pad and land design in controlling thermal behavior during soldering, aiding in process optimization.
• Standard Harmonization: This edition replaces the IEC 61188-5 series, aligning with the latest industry practices and requirements.

Applications

IEC 61188-6-3:2024 is essential for professionals involved in:

• PCB Design and Layout: Engineers and designers use this standard to create land patterns for THT components that ensure manufacturable and reliable solder joints.
• Electronic Manufacturing: Ensures that contract manufacturers and assembly houses have clear guidelines to optimize production yields, reduce defects, and meet international quality benchmarks.
• Component Specification: Facilitates communication between component suppliers and PCB designers regarding footprint requirements for new or custom THT components.
• Quality Assurance: Serves as a reference for inspectors and quality engineers to assess conformity of PCB assemblies to industry standards.
• Education and Training: Provides a foundation for curricula teaching best practices in electronics design, assembly, and soldering technologies.

Related Standards

• IEC 61191-1 / IEC 61191-3: Core references for solder joint requirements, guiding the criteria for robust electrical and mechanical connections.
• IEC 60194-2: Provides terminology and definitions for PCB design, manufacturing, and assembly.
• IEC 60352-5: Details requirements for solderless press-in connections, relevant for certain through hole assembly cases.
• IPC-7351: Industry-accepted guidelines for land pattern design, referenced historically and harmonized with developments in the IEC 61188 series.
• IEC 61188-6-x Series: Broader series covering other aspects of PCB and component land pattern design.

Practical Value

By adhering to IEC 61188-6-3:2024, stakeholders in the electronics industry can achieve:

• Enhanced reliability and durability in soldered THT assemblies
• Improved productivity and reduced rework due to standardized land pattern practices
• Compatibility with a wide range of manufacturing and assembly technologies
• Confidence in international compliance and easier cross-border collaboration

This standard is a key resource for anyone involved in the design, manufacture, or quality assessment of printed circuit boards employing through hole components.