Overview
IEC TR 61188-8:2021 - "Circuit boards and circuit board assemblies - Design and use - Part 8: 3D shape data for CAD component library" - is a Technical Report from the IEC that defines how 2D drawings and 3D shape data for semiconductor devices and electrical components should be configured when registered in a CAD component library. The report helps standardize component shape data used in PCB design and electronic assembly workflows to improve interoperability, consistency and downstream manufacturability.
Key Topics and Requirements
Practical Applications and Users
Who benefits from IEC TR 61188-8:2021:
- PCB designers and layout engineers who maintain or consume CAD component libraries.
- Component manufacturers providing CAD models and datasheets.
- CAD library managers ensuring consistent model quality across projects.
- Mechanical and electronic integration teams performing collision checks, enclosure fits and virtual assembly.
- Assembly and pick‑and‑place process engineers relying on accurate reference points and placement angles.
Practical use cases:
- Creating interoperable CAD models (STEP/IGES/DXF) for component libraries.
- Ensuring consistent footprints, courtyards and placement metadata for automated assembly.
- Reducing errors during PCB layout, simulation, thermal/mechanical verification and manufacturing handover.
Related Standards and References
- IEC 61188 series - broader guidance for circuit board design and use.
- ISO 10303 (STEP), IGES, DXF - common CAD exchange formats referenced in the report for 3D/2D data interoperability.
By applying IEC TR 61188-8:2021, organizations can improve the quality and consistency of CAD component libraries, streamline PCB design-to-manufacture handover, and enhance cross‑discipline collaboration.