Overview
IEC 63563-3:2025 - Qi Specification version 2.0, Part 3: Mechanical, Thermal, and User Interface defines the basic physical, thermal and user-interface requirements and guidance for wireless power products. Published by IEC and based on the Wireless Power Consortium (WPC) Qi v2.0 documentation, the standard covers product and system dimensions, alignment aids, interface surface temperature behaviour, and user indications for Power Transmitter and Power Receiver products.
Key topics and requirements
- Scope and compliance
- Establishes mandatory design provisions (unless called out as informative or recommended) and follows ISO/IEC directives for normative language.
- Mechanical design
- Recommended Interface Surface sizes for good user experience:
- Baseline Power Profile (BPP): at least 107 × 177 mm.
- Extended Power Profile (EPP): recommended 439 × 329 mm.
- Guidance to mark or otherwise indicate Active Area(s) on the transmitter (visual markings, lighting, logos).
- Power Receiver form-factor guidance (X,Y dimensions) aligned to the same profile limits.
- Alignment and coil placement
- Power Receiver designs must include a Secondary Coil and Interface Surface. The distance from the Secondary Coil to the Interface Surface shall not exceed 2.5 mm across the bottom face of the coil.
- Alignment aids for both transmitter and receiver are described to improve user experience and charging efficiency.
- Thermal (interface surface temperature rise)
- The document specifies requirements and test guidance related to the interface surface temperature rise during wireless power transfer and how to indicate thermal states to users (section on surface temperature rise is normative).
- User interface requirements
- Defines required user interactions and indications for both transmitter and receiver products (status, alignment, thermal warnings, etc.) to ensure predictable behavior and safety.
- Power Profiles
- Clarifies BPP and EPP capabilities and related mechanical expectations (compatibility between transmitter and receiver).
Applications and who uses this standard
- Product designers and mechanical engineers building wireless chargers, mobile devices, wearables, accessories, automotive or furniture-integrated charging surfaces.
- Thermal engineers responsible for interface surface temperature compliance and testing.
- UX/UI designers implementing alignment cues and user indications (LEDs, haptics, displays).
- Compliance and certification labs, manufacturers, and system integrators ensuring interoperability with Qi ecosystems and IEC conformity.
Related standards
- Other parts of the Qi Specification series: Power Delivery, Communications Physical Layer, Communications Protocol, Foreign Object Detection, NFC Tag Protection, Authentication Protocol (see the Qi Specification structure in IEC 63563 series).
- ISO/IEC Directives referenced for editorial and compliance conventions.
Keywords: IEC 63563-3:2025, Qi Specification version 2.0, wireless power, power transmitter, power receiver, mechanical design, thermal, user interface, alignment, interface surface temperature.