EN IEC 62680-1-3:2026
(Main)Universal Serial Bus interfaces for data and power - Part 1-3: Common components - USB Type-C® cable and connector specification
General Information
- Abstract
IEC 62680-1-3:2026, this specification, defines the USB Type-C® receptacles, plug and cables. The USB Type-C Cable and Connector Specification is guided by the following principles: - Enable new and exciting host and device form-factors where size, industrial design and style are important parameters - Work seamlessly with existing USB host and device silicon solutions - Enhance ease of use for connecting USB devices with a focus on minimizing user confusion for plug and cable orientation The USB Type-C Cable and Connector Specification defines a receptacle, plug, cable, and detection mechanisms that are compatible with existing USB interface electrical and functional specifications. This specification covers the following aspects that are needed to produce and use this new USB cable/connector solution in newer platforms and devices, and that interoperate with existing platforms and devices: - USB Type-C receptacles, including electro-mechanical definition and performance requirements - USB Type-C plugs and cable assemblies, including electro-mechanical definition and performance requirements - USB Type-C to legacy cable assemblies and adapters - USB Type-C-based device detection and interface configuration, including support for legacy connections - USB Power Delivery optimized for the USB Type-C connector. IEC 62680-1-3:2026 cancels and replaces the sixth edition published in 2024 and constitutes an editorial revision. This standard is the USB-IF publication Universal Serial Bus Type-C Cable and Connector Specification Revision 2.4. New release primarily includes incorporation of all approved ECNs as of the revision date plus editorial clean-up.
- Status
- Published
- Publication Date
- 26-Mar-2026
- Current Stage
- 6060 - Document made available - Publishing
- Start Date
- 27-Mar-2026
- Due Date
- 31-Mar-2026
- Completion Date
- 27-Mar-2026
Overview
EN IEC 62680-1-3:2026 specifies the requirements for Universal Serial Bus (USB) Type-C® cable and connector interfaces for data transfer and power delivery. Developed by the European Committee for Electrotechnical Standardization (CLC) and aligned with international IEC guidelines, this standard defines the electro-mechanical parameters of USB Type-C receptacles, plugs, and cables. Its primary objective is to enable innovative device designs, support seamless compatibility with existing USB technologies, and simplify user interactions by reducing orientation confusion during connections.
This specification incorporates fundamental principles to ensure ease of use, robust performance, and support for both new and legacy USB platforms. Key updates in this edition reflect the incorporation of recent industry change notifications and editorial improvements, ensuring ongoing relevance in a rapidly evolving technology landscape.
Key Topics
- USB Type-C Connector and Cable Definitions: Establishes comprehensive requirements for USB Type-C receptacles, plugs, and cable assemblies, including electro-mechanical and detection features.
- Compatibility with Legacy Devices: Describes USB Type-C to legacy cable and adapter assemblies for interoperability with preceding USB generations.
- Device Detection and Configuration: Outlines mechanisms for detecting device attachment, plug orientation, and configuring interfaces for optimal performance.
- Power Delivery Optimization: Details the support for USB Power Delivery (USB PD), enhancing charging and power sourcing capabilities for a wide range of device types.
- Mechanical and Environmental Requirements: Specifies standards for durability, shielding effectiveness, environmental resilience, and mechanical compatibility.
- Performance and Reliability: Standardizes cable construction, electrical characteristics, and testing methods to ensure reliable data and power transmission.
Applications
EN IEC 62680-1-3:2026 is critical for manufacturers, designers, and integrators involved in:
- Consumer Electronics: Utilized in smartphones, tablets, laptops, and docking stations, supporting universal connectivity and faster charging.
- Peripheral Devices: Ensures compatibility across USB hubs, storage devices, digital audio interfaces, and other accessories.
- Power Adapters and Charging Solutions: Enables multi-port USB Type-C chargers and high-efficiency power banks.
- Legacy System Integration: Facilitates the connection of new USB Type-C devices with older USB formats, reducing e-waste and extending device lifecycles.
- Automotive, Industrial, and Medical Devices: Promotes standardization for USB-based data transfer and power delivery in a broad set of use cases.
- Active Cables and Advanced Use Cases: Supports both passive and electronically-marked (active) USB Type-C cables, including enhanced power ranges and special configurations.
Through clear definitions and requirements, this standard supports innovation while ensuring interface consistency and interoperability, which directly benefits end-users and manufacturers alike.
Related Standards
For a comprehensive approach to USB interface and power delivery solutions, the following related standards should be considered:
- EN IEC 62680-1-1: USB core specification for data transfer
- EN IEC 62680-1-2: USB Micro-USB cables and connectors
- EN IEC 62680-1-4: USB Power Delivery specifications
- EN IEC 62680-1-6: USB4™ and related high-speed data transfer specifications
- IEC 61076 Series: Connectors for electronic equipment
- ISO/IEC 11801: General standards for IT cabling infrastructure
By conforming to EN IEC 62680-1-3:2026, organizations benefit from recognized best-practices, improved device interoperability, and future-proofed product development, supporting the fast-evolving landscape of USB connectivity for data and power.
Relations
- Effective Date
- 13-May-2025
- Effective Date
- 31-Mar-2026
- Effective Date
- 31-Mar-2026
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Frequently Asked Questions
EN IEC 62680-1-3:2026 is a standard published by CLC. Its full title is "Universal Serial Bus interfaces for data and power - Part 1-3: Common components - USB Type-C® cable and connector specification". This standard covers: IEC 62680-1-3:2026, this specification, defines the USB Type-C® receptacles, plug and cables. The USB Type-C Cable and Connector Specification is guided by the following principles: - Enable new and exciting host and device form-factors where size, industrial design and style are important parameters - Work seamlessly with existing USB host and device silicon solutions - Enhance ease of use for connecting USB devices with a focus on minimizing user confusion for plug and cable orientation The USB Type-C Cable and Connector Specification defines a receptacle, plug, cable, and detection mechanisms that are compatible with existing USB interface electrical and functional specifications. This specification covers the following aspects that are needed to produce and use this new USB cable/connector solution in newer platforms and devices, and that interoperate with existing platforms and devices: - USB Type-C receptacles, including electro-mechanical definition and performance requirements - USB Type-C plugs and cable assemblies, including electro-mechanical definition and performance requirements - USB Type-C to legacy cable assemblies and adapters - USB Type-C-based device detection and interface configuration, including support for legacy connections - USB Power Delivery optimized for the USB Type-C connector. IEC 62680-1-3:2026 cancels and replaces the sixth edition published in 2024 and constitutes an editorial revision. This standard is the USB-IF publication Universal Serial Bus Type-C Cable and Connector Specification Revision 2.4. New release primarily includes incorporation of all approved ECNs as of the revision date plus editorial clean-up.
IEC 62680-1-3:2026, this specification, defines the USB Type-C® receptacles, plug and cables. The USB Type-C Cable and Connector Specification is guided by the following principles: - Enable new and exciting host and device form-factors where size, industrial design and style are important parameters - Work seamlessly with existing USB host and device silicon solutions - Enhance ease of use for connecting USB devices with a focus on minimizing user confusion for plug and cable orientation The USB Type-C Cable and Connector Specification defines a receptacle, plug, cable, and detection mechanisms that are compatible with existing USB interface electrical and functional specifications. This specification covers the following aspects that are needed to produce and use this new USB cable/connector solution in newer platforms and devices, and that interoperate with existing platforms and devices: - USB Type-C receptacles, including electro-mechanical definition and performance requirements - USB Type-C plugs and cable assemblies, including electro-mechanical definition and performance requirements - USB Type-C to legacy cable assemblies and adapters - USB Type-C-based device detection and interface configuration, including support for legacy connections - USB Power Delivery optimized for the USB Type-C connector. IEC 62680-1-3:2026 cancels and replaces the sixth edition published in 2024 and constitutes an editorial revision. This standard is the USB-IF publication Universal Serial Bus Type-C Cable and Connector Specification Revision 2.4. New release primarily includes incorporation of all approved ECNs as of the revision date plus editorial clean-up.
EN IEC 62680-1-3:2026 is classified under the following ICS (International Classification for Standards) categories: 33.120.20 - Wires and symmetrical cables; 33.120.30 - RF connectors; 35.200 - Interface and interconnection equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
EN IEC 62680-1-3:2026 has the following relationships with other standards: It is inter standard links to EN IEC 62680-1-3:2025, EN 63002:2017, EN IEC 63002:2021. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN IEC 62680-1-3:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2026
Vmesniki univerzalnega serijskega vodila za prenos podatkov in napajanje - 1-3.
del: Skupne komponente - Specifikacija za kable in priključke univerzalnega
serijskega vodila tipa C(r) (IEC 62680-1-3:2026)
Universal Serial Bus interfaces for data and power - Part 1-3: Common components -
USB Type-C(r) cable and connector specification (IEC 62680-1-3:2026)
Universelle Bus-Schnittstellen für Daten und Energie - Teil 1-3: Gemeinsame
Komponenten - Festlegung für USB Type-C Kabel und Steckverbindung (IEC 62680-1-
3:2026)
Interfaces de bus universel en série pour les données et l'alimentation électrique - Partie
1-3: Composants communs - Spécification des câbles et des connecteurs USB Type
C(r) (IEC 62680-1-3:2026)
Ta slovenski standard je istoveten z: EN IEC 62680-1-3:2026
ICS:
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 62680-1-3
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2026
ICS 33.120.20; 33.120.30; 35.200 Supersedes EN IEC 62680-1-3:2025
English Version
Universal Serial Bus interfaces for data and power - Part 1-3:
Common components - USB Type-C(r) cable and connector
specification
(IEC 62680-1-3:2026)
Interfaces de bus universel en série pour les données et Universelle Bus-Schnittstellen für Daten und Energie - Teil
l'alimentation électrique - Partie 1-3: Composants communs 1-3: Gemeinsame Komponenten - Festlegung für USB
- Spécification des câbles et des connecteurs USB Type- Type-C Kabel und Steckverbindung
C(r) (IEC 62680-1-3:2026)
(IEC 62680-1-3:2026)
This European Standard was approved by CENELEC on 2026-03-18. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62680-1-3:2026 E
European foreword
The text of document 100/4332/CDV, future edition 7 of IEC 62680-1-3, prepared by TC 100/Technical
Area 18 "(Disbanded) - Multimedia home systems and applications for end-user networks" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 62680-1-3:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-03-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-03-31
document have to be withdrawn
This document supersedes EN IEC 62680-1-3:2025 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62680-1-3:2026 was approved by CENELEC as a
European Standard without any modification.
IEC 62680-1-3 ®
Edition 7.0 2026-02
INTERNATIONAL
STANDARD
Universal Serial Bus interfaces for data and power -
Part 1-3: Common components - USB Type-C® cable and connector
specification
ICS 33.120.20; 33.120.30; 35.200 ISBN 978-2-8327-0989-4
IEC 62680-1-3:2026-02(en)
IEC 62680-1-3:2026 © USB-IF 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Universal Serial Bus interfaces for data and power -
Part 1-3: Common components - USB Type-C® cable and connector
specification
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all
national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-
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entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in
this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also
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in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all interested
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation
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6) All users should ensure that they have the latest edition of this publication.
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of its technical committees and IEC National Committees for any personal injury, property damage or other damage
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the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s).
IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof.
As of the date of publication of this document, IEC had received notice of (a) patent(s), which may be required to
implement this document. However, implementers are cautioned that this may not represent the latest information,
which may be obtained from the patent database available at https://patents.iec.ch. IEC shall not be held responsible
for identifying any or all such patent rights.
IEC 62680-1-3 has been prepared by technical area 18: Multimedia home systems and applications
for end-user networks, of IEC technical committee 100: Audio, video and multimedia systems and
equipment. It is an International Standard.
The text of this standard was prepared by the USB Implementers Forum (USB-IF). The structure
and editorial rules used in this publication reflect the practice of the organization which submitted
it.
IEC 62680-1-3:2026 © USB-IF 2024
The text of this International Standard is based on the following documents:
Draft Report on voting
100/4332/CDV 100/4381/RVC
Full information on the voting for its approval can be found in the report on voting indicated in the
above table.
A list of all parts in the IEC 62680 series, published under the general title Universal serial bus
interfaces for data and power, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the specific
document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IEC 62680-1-3:2026 © USB-IF 2024
Universal Serial Bus
Type-C Cable and Connector
Specification
Release 2.4
October 2024
IEC 62680-1-3:2026 © USB-IF 2024
Apple Inc., HP Inc., Intel Corporation, Microsoft Corporation,
Renesas, STMicroelectronics, and Texas Instruments
All rights reserved. ®
NOTE: Adopters may only use the USB Type-C cable and connector to implement USB or third-party
functionality as expressly described in this Speci�ication; all other uses are prohibited.
LIMITED COPYRIGHT LICENSE: The USB 3.0 Promoters grant a conditional copyright license under the
copyrights embodied in the USB Type-C Cable and Connector Speci�ication to use and reproduce the
Speci�ication for the sole purpose of, and solely to the extent necessary for, evaluating whether to implement
the Speci�ication in products that would comply with the speci�ication. Without limiting the foregoing, use of
the Speci�ication for the purpose of �iling or modifying any patent application to target the Speci�ication or
USB compliant products is not authorized. Except for this express copyright license, no other rights or
licenses are granted, including without limitation any patent licenses. In order to obtain any additional
intellectual property licenses or licensing commitments associated with the Speci�ication a party must
execute the USB 3.0 Adopters Agreement. NOTE: By using the Speci�ication, you accept these license terms on
your own behalf and, in the case where you are doing this as an employee, on behalf of your employer.
INTELLECTUAL PROPERTY DISCLAIMER
THIS SPECIFICATION IS PROVIDED TO YOU "AS IS" WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY
WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE.
THE AUTHORS OF THIS SPECIFICATION DISCLAIM ALL LIABILITY, INCLUDING LIABILITY FOR
INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USE OR IMPLEMENTATION OF
INFORMATION IN THIS SPECIFICATION. THE PROVISION OF THIS SPECIFICATION TO YOU DOES NOT
PROVIDE YOU WITH ANY LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY
INTELLECTUAL PROPERTY RIGHTS.
All implementation examples and reference designs contained within this Speci�ication are included as part of
the limited patent license for those companies that execute the USB 3.0 Adopters Agreement.
® ® ®
USB Type-C , USB-C and USB4 are trademarks of the Universal Serial Bus Implementers Forum (USB-IF).
DisplayPort™ is a trademark of VESA. All product names are trademarks, registered trademarks, or service
marks of their respective owners.
Thunderbolt™ is a trademark of Intel Corporation. You may only use the Thunderbolt™ trademark or logo in
conjunction with products designed to this speci�ication that complete proper certi�ication and executing a
Thunderbolt™ trademark license – see https://www.usb.org/compliance for further information.
IEC 62680-1-3:2026 © USB-IF 2024
Contents
Speci�ication Editor . 20
Speci�ication Work Group Contributors . 20
Pre-Release Draft Industry Reviewing Companies That Provided Feedback . 28
Revision History . 29
1 Introduction . 30
1.1 Purpose . 30
1.2 Scope . 30
1.3 Related Documents . 30
1.4 Conventions . 31
1.4.1 Precedence . 31
1.4.2 Keywords . 31
1.4.3 Numbering. 32
1.5 Terms and Abbreviations . 32
2 Overview . 38
2.1 Introduction . 38
2.2 USB Type-C Receptacles, Plugs and Cables . 39
2.3 Con�iguration Process . 40
2.3.1 Source-to-Sink Attach/Detach Detection . 41
2.3.2 Plug Orientation/Cable Twist Detection . 41
2.3.3 Initial Power (Source-to-Sink) Detection and Establishing the Data (Host-to-Device) Relationship
2.3.4 USB Type-C VBUS Current Detection and Usage . 42
2.3.5 USB PD Communications. 42
2.3.6 Functional Extensions . 43
2.4 VBUS . 43
2.5 VCONN . 43
2.6 Hubs . 44
3 Mechanical . 45
3.1 Overview . 45
3.1.1 Compliant Connectors . 45
3.1.2 Compliant Cable Assemblies . 45
3.1.3 Compliant USB Type-C to Legacy Cable Assemblies . 46
3.1.4 Compliant USB Type-C to Legacy Adapter Assemblies . 47
3.2 USB Type-C Connector Mating Interfaces . 47
3.2.1 Interface De�inition. 47
3.2.2 Reference Designs . 71
IEC 62680-1-3:2026 © USB-IF 2024
3.2.3 Pin Assignments and Descriptions . 78
3.3 Cable Construction and Wire Assignments . 79
3.3.1 Cable Construction (Informative) . 79
3.3.2 Wire Assignments . 81
3.3.3 Wire Gauges and Cable Diameters (Informative) . 82
3.4 Standard USB Type-C Cable Assemblies . 84
3.4.1 USB Full-Featured Type-C Cable Assembly . 84
3.4.2 USB 2.0 Type-C Cable Assembly . 86
3.4.3 USB Type-C Captive Cable Assembly . 86
3.4.4 USB Type-C Thumb Drive Assembly . 87
3.5 Legacy Cable Assemblies . 87
3.5.1 USB Type-C to USB 3.1 Standard-A Cable Assembly . 88
3.5.2 USB Type-C to USB 2.0 Standard-A Cable Assembly . 89
3.5.3 USB Type-C to USB 3.1 Standard-B Cable Assembly . 90
3.5.4 USB Type-C to USB 2.0 Standard-B Cable Assembly . 91
3.5.5 USB Type-C to USB 2.0 Mini-B Cable Assembly . 92
3.5.6 USB Type-C to USB 3.1 Micro-B Cable Assembly . 93
3.5.7 USB Type-C to USB 2.0 Micro-B Cable Assembly . 94
3.6 Legacy Adapter Assemblies. 94
3.6.1 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly . 94
3.6.2 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly . 96
3.7 Electrical Characteristics . 96
3.7.1 Raw Cable (Informative) . 97
3.7.2 USB Type-C to USB Type-C Passive Cable Assemblies . 98
3.7.3 Mated Connector (Informative – USB 3.2 Gen2 and USB4 Gen2). 120
3.7.4 Receptacle Connector SI Requirements and Testing (Normative – USB4 Gen3/Gen4) . 124
3.7.5 USB Type-C to USB Legacy Cable Assemblies (Normative) . 126
3.7.6 USB Type-C to USB Legacy Adapter Assemblies (Normative) . 130
3.7.7 Shielding Effectiveness Requirements (Normative) . 133
3.7.8 DC Electrical Requirements (Normative). 135
3.8 Mechanical and Environmental Requirements (Normative) . 138
3.8.1 Mechanical Requirements . 138
3.8.2 Environmental Requirements . 143
3.9 Docking Applications (Informative) . 144
3.10 Implementation Notes and Design Guides . 145
3.10.1 EMC Management (Informative) . 145
IEC 62680-1-3:2026 © USB-IF 2024
3.10.2 Stacked and Side-by-Side Connector Physical Spacing (Informative) . 148
3.10.3 Cable Mating Considerations (Informative) . 148
3.11 Extended Power Range (EPR) Cables . 150
3.11.1 Electrical Requirements . 150
3.11.2 EPR Cable Identi�ication Requirements . 150
4 Functional . 151
4.1 Signal Summary . 151
4.2 Signal Pin Descriptions . 151
4.2.1 USB 3.2/USB4 Pins . 151
4.2.2 USB 2.0 Pins . 152
4.2.3 Auxiliary Signal Pins . 152
4.2.4 Power and Ground Pins . 152
4.2.5 Con�iguration Pins . 152
4.3 Sideband Use (SBU) . 152
4.4 Power and Ground. 153
4.4.1 IR Drop . 153
4.4.2 VBUS . 154
4.4.3 VCONN . 155
4.5 Con�iguration Channel (CC) . 160
4.5.1 Architectural Overview . 160
4.5.2 CC Functional and Behavioral Requirements . 172
4.5.3 USB Port Interoperability Behavior . 208
4.6 Power . 226
4.6.1 Power Requirements during USB Suspend . 227
4.6.2 VBUS Power Provided Over a USB Type-C Cable . 228
4.7 USB Hubs . 233
4.8 Power Sourcing and Charging . 234
4.8.1 DFP as a Power Source . 234
4.8.2 Non-USB Charging Methods . 236
4.8.3 Sinking Host . 237
4.8.4 Sourcing Device . 237
4.8.5 Charging a System with a Dead Battery . 237
4.8.6 USB Type-C Multi-Port Chargers . 237
4.9 Electronically Marked Cables . 241
4.9.1 Parameter Values . 242
4.9.2 Active Cables . 242
IEC 62680-1-3:2026 © USB-IF 2024
4.10 VCONN-Powered Accessories (VPAs) and VCONN-Powered USB Devices (VPDs) . 243
4.10.1 VCONN-Powered Accessories (VPAs) . 243
4.10.2 VCONN-Powered Devices (VPDs) . 243
4.11 Parameter Values . 245
4.11.1 Termination Parameters . 245
4.11.2 Timing Parameters . 247
4.11.3 Voltage Parameters . 251
5 USB4 Discovery and Entry . 258
5.1 Overview of the Discovery and Entry Process . 258
5.2 USB4 Functional Requirements . 259
5.2.1 USB4 Host Functional Requirements . 259
5.2.2 USB Device Functional Requirements . 259
5.2.3 USB4 Alternate Mode Support . 259
5.3 USB4 Power Requirements . 260
5.3.1 Source Power Requirements . 260
5.3.2 Sink Power Requirements . 260
5.3.3 Device Power Management Requirements . 260
5.4 USB4 Discovery and Entry Flow Requirements . 261
5.4.1 USB Type-C Initial Connection . 261
5.4.2 USB Power Delivery Contract . 261
5.4.3 USB4 Discovery and Entry Flow . 261
5.4.4 USB4 Post-Entry Operation . 267
5.5 USB4 Hub Connection Requirements. 267
5.5.1 USB4 Hub Port Initial Connection Requirements . 267
5.5.2 USB4 Hub UFP and Host Capabilities Discovery . 267
5.5.3 Hub DFP Connection Requirements . 268
5.5.4 Hub Ports Connection Behavior Flow Examples . 269
5.5.5 Connecting to Downstream USB4 Hubs . 275
5.5.6 Fallback Functional Requirements for USB4 Hubs . 275
5.6 USB4 Device Connection Requirements . 276
5.6.1 Fallback Mapping of USB4 Peripheral Functions of USB Device Class Types . 276
5.7 Parameter Values . 277
5.7.1 Timing Parameters . 277
6 Active Cables . 278
6.1 General Speci�ications for All Active Cables . 278
6.1.1 Discovering Active Cable Characteristics . 278
IEC 62680-1-3:2026 © USB-IF 2024
6.1.2 Electrical Requirements . 280
6.1.3 Mechanical Requirements . 312
6.2 Additional Speci�ications for Copper and Hybrid-Optical Active Cables . 313
6.2.1 Active Cable Block Diagram . 314
6.2.2 USB4 Asymmetric Mode Support . 314
6.2.3 Active Cable USB PD Requirements . 314
6.2.4 Active Cable Behaviors in Response to USB PD Events . 314
6.2.5 Active Cable Power Requirements . 315
6.3 Additional Speci�ications for Optically Isolated Active Cables . 315
6.3.1 OIAC Block Diagrams . 316
6.3.2 OIAC Limitations and General Requirements . 318
6.3.3 OIAC Cable Power Requirements . 319
6.3.4 OIAC USB PD Requirements . 319
6.3.5 OIAC Connection Flow and State Diagrams . 329
6.3.6 Additional Electrical Requirements for OIAC . 348
6.3.7 Additional Mechanical Requirements for OIAC . 351
A Liquid Corrosion Mitigation Mode . 352
A.1 Overview . 352
A.2 Detail . 352
A.3 Liquid Detection Methods . 354
A.3.1 Liquid Measurement Method . 354
A.3.2 Pulsed Measurement Method . 354
A.3.3 Impedance Measurement Method . 355
A.4 Liquid Detection Pins in the Connector . 358
B Debug Accessory Mode . 361
B.1 Overview . 361
B.2 Functional . 361
B.2.1 Signal Summary . 361
B.2.2 Port Interoperability . 362
B.2.3 Debug Accessory Mode Entry . 362
B.2.4 Connection State Diagrams. 362
B.2.5 DTS Port Interoperability Behaviors . 371
B.2.6 Orientation Detection. 380
B.3 Security/Privacy Requirements .
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