Release 2.1 - 1 - USB Type-C Cable and
May 2021 Connector Specification
Copyright © 2021 USB 3.0 Promoter Group. All rights reserved.
Universal Serial Bus
Type-C Cable and Connector
Specification
Release 2.01
August 2019
May 2021
Release 2.1 - 2 - USB Type-C Cable and
May 2021 Connector Specification
Copyright © 2021 USB 3.0 Promoter Group. All rights reserved.
Copyright © 2014-20192021, USB 3.0 Promoter Group:
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 Specification; 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 Specification to use and reproduce
the Specification for the sole purpose of, and solely to the extent necessary for, evaluating whether to
implement the Specification in products that would comply with the specification. Without limiting
the foregoing, use of the Specification for the purpose of filing or modifying any patent application to
target the Specification 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 Specification a party must execute the USB 3.0 Adopters Agreement. NOTE: By
using the Specification, 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 Specification 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 specification that complete
proper certification and executing a Thunderbolt™ trademark license – see
usb.org/compliance for further information.
Release 2.1 - 3 - USB Type-C Cable and
May 2021 Connector Specification
Copyright © 2021 USB 3.0 Promoter Group. All rights reserved.
CONTENTS
Specification Work Group Chairs / Specification Editors .................................................... 16
Specification Work Group Contributors .................................................................................... 16
Pre-Release Draft Industry Reviewing Companies That Provided Feedback ................. 23
Revision History ................................................................................................................................ 24
1 Introduction ............................................................................................................................... 25
1.1 Purpose ............................................................................................................................ 25
1.2 Scope ................................................................................................................................. 25
1.3 Related Documents....................................................................................................... 26
1.4 Conventions .................................................................................................................... 26
1.4.1 Precedence ...................................................................................................... 26
1.4.2 Keywords ......................................................................................................... 26
1.4.3 Numbering ....................................................................................................... 27
1.5 Terms and Abbreviations ........................................................................................... 27
2 Overview ..................................................................................................................................... 32
2.1 Introduction ................................................................................................................... 32
2.2 USB Type-C Receptacles, Plugs and Cables ........................................................... 33
2.3 Configuration Process ................................................................................................. 34
2.3.1 Source-to-Sink Attach/Detach Detection ............................................... 35
2.3.2 Plug Orientation/Cable Twist Detection ................................................ 35
2.3.3 Initial Power (Source-to-Sink) Detection and Establishing the Data
(Host-to-Device) Relationship ................................................................... 35
2.3.4 USB Type-C VBUS Current Detection and Usage ................................... 36
2.3.5 USB PD Communication ............................................................................... 37
2.3.6 Functional Extensions .................................................................................. 37
2.4 VBUS ................................................................................................................................... 37
2.5 VCONN ................................................................................................................................ 38
2.6 Hubs .................................................................................................................................. 39
3 Mechanical .................................................................................................................................. 40
3.1 Overview ......................................................................................................................... 40
3.1.1 Compliant Connectors .................................................................................. 40
3.1.2 Compliant Cable Assemblies ...................................................................... 40
3.1.3 Compliant USB Type-C to Legacy Cable Assemblies ........................... 41
3.1.4 Compliant USB Type-C to Legacy Adapter Assemblies ...................... 42
3.2 USB Type-C Connector Mating Interfaces ............................................................. 42
3.2.1 Interface Definition....................................................................................... 42
3.2.2 Reference Designs ......................................................................................... 65
3.2.3 Pin Assignments and Descriptions ........................................................... 72
3.3 Cable Construction and Wire Assignments ........................................................... 73
3.3.1 Cable Construction (Informative) ............................................................ 73
3.3.2 Wire Assignments ......................................................................................... 75
3.3.3 Wire Gauges and Cable Diameters (Informative) ................................ 76
Release 2.1 - 4 - USB Type-C Cable and
May 2021 Connector Specification
Copyright © 2021 USB 3.0 Promoter Group. All rights reserved.
3.4 Standard USB Type-C Cable Assemblies ................................................................ 78
3.4.1 USB Full-Featured Type-C Cable Assembly ........................................... 78
3.4.2 USB 2.0 Type-C Cable Assembly ................................................................ 79
3.4.3 USB Type-C Captive Cable Assemblies .................................................... 80
3.4.4 USB Type-C Thumb Drive Assemblies ..................................................... 80
3.5 Legacy Cable Assemblies ............................................................................................ 81
3.5.1 USB Type-C to USB 3.1 Standard-A Cable Assembly ........................... 81
3.5.2 USB Type-C to USB 2.0 Standard-A Cable Assembly ........................... 83
3.5.3 USB Type-C to USB 3.1 Standard-B Cable Assembly ........................... 84
3.5.4 USB Type-C to USB 2.0 Standard-B Cable Assembly ........................... 85
3.5.5 USB Type-C to USB 2.0 Mini-B Cable Assembly .................................... 86
3.5.6 USB Type-C to USB 3.1 Micro-B Cable Assembly .................................. 87
3.5.7 USB Type-C to USB 2.0 Micro-B Cable Assembly .................................. 89
3.6 Legacy Adapter Assemblies ....................................................................................... 90
3.6.1 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly 90
3.6.2 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly ....... 92
3.7 Electrical Characteristics ........................................................................................... 93
3.7.1 Raw Cable (Informative) ............................................................................. 93
3.7.2 USB Type-C to Type-C Passive Cable Assemblies (Normative) ....... 94
3.7.3 Mated Connector (Informative – USB 3.2 Gen2 and USB4 Gen2) 116
3.7.4 Receptacle Connector SI Requirements and Testing (Normative –
USB4 Gen3) ................................................................................................... 119
3.7.5 USB Type-C to Legacy Cable Assemblies (Normative) .................... 121
3.7.6 USB Type-C to USB Legacy Adapter Assemblies (Normative) ...... 124
3.7.7 Shielding Effectiveness Requirements (Normative) ........................ 126
3.7.8 DC Electrical Requirements (Normative) ........................................... 129
3.8 Mechanical and Environmental Requirements (Normative) ........................ 132
3.8.1 Mechanical Requirements ........................................................................ 133
3.8.2 Environmental Requirements................................................................. 138
3.9 Docking Applications (Informative) .................................................................... 139
3.10 Implementation Notes and Design Guides ......................................................... 140
3.10.1 EMC Management (Informative)............................................................ 140
3.10.2 Stacked and Side-by-Side Connector Physical Spacing (Informative)
.......................................................................................................................... 143
3.10.3 Cable Mating Considerations (Informative) ....................................... 143
3.11 Extended Power Range (EPR) Cables .................................................................. 144
3.11.1 Electrical Requirements ........................................................................... 144
3.11.2 EPR Cable Indentification Requirements ............................................ 144
4 Functional ................................................................................................................................ 145
4.1 Signal Summary .......................................................................................................... 145
4.2 Signal Pin Descriptions ............................................................................................ 145
4.2.1 SuperSpeed USB Pins ................................................................................ 145
4.2.2 USB 2.0 Pins ................................................................................................. 146
4.2.3 Auxiliary Signal Pins .................................................................................. 146
Release 2.1 - 5 - USB Type-C Cable and
May 2021 Connector Specification
Copyright © 2021 USB 3.0 Promoter Group. All rights reserved.
4.2.4 Power and Ground Pins ............................................................................ 146
4.2.5 Configuration Pins ..................................................................................... 146
4.3 Sideband Use (SBU)................................................................................................... 146
4.4 Power and Ground ..................................................................................................... 147
4.4.1 IR Drop........................................................................................................... 147
4.4.2 VBUS................................................................................................................. 148
4.4.3 VCONN .............................................................................................................. 150
4.5 Configuration Channel (CC) .................................................................................... 157
4.5.1 Architectural Overview ............................................................................ 157
4.5.2 CC Functional and Behavioral Requirements .................................... 171
4.5.3 USB Port Interoperability Behavior ...................................................... 209
4.6 Power............................................................................................................................. 228
4.6.1 Power Requirements during USB Suspend ......................................... 229
4.6.2 VBUS Power Provided Over a USB Type-C Cable ............................... 230
4.7 USB Hubs ...................................................................................................................... 236
4.8 Power Sourcing and Charging ................................................................................ 237
4.8.1 DFP as a Power Source ............................................................................. 237
4.8.2 Non-USB Charging Methods .................................................................... 240
4.8.3 Sinking Host ................................................................................................. 240
4.8.4 Sourcing Device ........................................................................................... 240
4.8.5 Charging a System with a Dead Battery .............................................. 240
4.8.6 USB Type-C Multi-Port Chargers ........................................................... 241
4.9 Electronically Marked Cables ................................................................................. 244
4.9.1 Parameter Values ....................................................................................... 245
4.9.2 Active Cables ................................................................................................ 246
4.10 VCONN-Powered Accessories (VPAs) and VCONN-Powered USB Devices
(VPDs) ........................................................................................................................... 246
4.10.1 VCONN-Powered Accessories (VPAs) ..................................................... 246
4.10.2 VCONN-Powered USB Devices (VPDs) ................................................... 246
4.11 Parameter Values ....................................................................................................... 248
4.11.1 Termination Parameters .......................................................................... 248
4.11.2 Timing Parameters ..................................................................................... 250
4.11.3 Voltage Parameters .................................................................................... 253
5 USB4 Discovery and Entry .................................................................................................. 255
5.1 Overview of the Discovery and Entry Process .................................................. 255
5.2 USB4 Functional Requirements ............................................................................. 256
5.2.1 USB4 Host Functional Requirements ................................................... 256
5.2.2 USB4 Device Functional Requirements ............................................... 256
5.2.3 USB4 Alternate Mode Support ................................................................ 256
5.2.3.1 USB4 Alternate Mode Support on Hosts .............................................. 256
5.2.3.2 USB4 Alternate Mode Support on Hubs and USB4-based Docks .. 256
5.3 USB4 Power Requirements ..................................................................................... 257
5.3.1 Source Power Requirements ................................................................... 257
5.3.2 Sink Power Requirements ....................................................................... 257
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