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Release 2.0 - 1 - USB Type-C Cable and

August 2019 Connector Specification

Universal Serial Bus

Type-C Cable and Connector

Specification

Release 2.0

August 2019

Release 2.0 - 2 - USB Type-C Cable and

August 2019 Connector Specification

Apple Inc., HP Inc., Intel Corporation, Microsoft

Corporation, Renesas, STMicroelectronics, and Texas Instruments

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

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 2.0  - 3 -  USB Type-C Cable and 
August 2019    Connector Specification 
Copyright © 2019 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 ................. 22 
Revision History ................................................................................................................................ 22 
Introduction ............................................................................................................................... 23 
1  Purpose ............................................................................................................................ 23 
2  Scope ................................................................................................................................. 23 
3  Related Documents....................................................................................................... 24 
4  Conventions .................................................................................................................... 24 
4.1  Precedence ...................................................................................................... 24 
4.2  Keywords ......................................................................................................... 24 
4.3  Numbering ....................................................................................................... 25 
5  Terms and Abbreviations ........................................................................................... 25 
Overview ..................................................................................................................................... 30 
1  Introduction ................................................................................................................... 30 
2  USB Type-C Receptacles, Plugs and Cables ........................................................... 31 
3  Configuration Process ................................................................................................. 32 
3.1  Source-to-Sink Attach/Detach Detection ............................................... 33 
3.2  Plug Orientation/Cable Twist Detection ................................................ 33 
3.3  Initial Power (Source-to-Sink) Detection and Establishing the Data 
(Host-to-Device) Relationship ................................................................... 33 
3.4  USB Type-C VBUS Current Detection and Usage ................................... 34 
3.5  USB PD Communication ............................................................................... 35 
3.6  Functional Extensions .................................................................................. 35 
4  VBUS ................................................................................................................................... 35 
5  VCONN ................................................................................................................................ 36 
6  Hubs .................................................................................................................................. 36 
Mechanical .................................................................................................................................. 37 
1  Overview ......................................................................................................................... 37 
1.1  Compliant Connectors .................................................................................. 37 
1.2  Compliant Cable Assemblies ...................................................................... 37 
1.3  Compliant USB Type-C to Legacy Cable Assemblies ........................... 37 
1.4  Compliant USB Type-C to Legacy Adapter Assemblies ...................... 38 
2  USB Type-C Connector Mating Interfaces ............................................................. 39 
2.1  Interface Definition....................................................................................... 39 
2.2  Reference Designs ......................................................................................... 61 
2.3  Pin Assignments and Descriptions ........................................................... 68 
3  Cable Construction and Wire Assignments ........................................................... 69 
3.1  Cable Construction (Informative) ............................................................ 69 
3.2  Wire Assignments ......................................................................................... 71 
3.3  Wire Gauges and Cable Diameters (Informative) ................................ 72 

Release 2.0  - 4 -  USB Type-C Cable and 
August 2019    Connector Specification 
Copyright © 2019 USB 3.0 Promoter Group. All rights reserved. 
4  Standard USB Type-C Cable Assemblies ................................................................ 74 
4.1  USB Full-Featured Type-C Cable Assembly ........................................... 74 
4.2  USB 2.0 Type-C Cable Assembly ................................................................ 75 
4.3  USB Type-C Captive Cable Assemblies .................................................... 76 
5  Legacy Cable Assemblies ............................................................................................ 76 
5.1  USB Type-C to USB 3.1 Standard-A Cable Assembly ........................... 77 
5.2  USB Type-C to USB 2.0 Standard-A Cable Assembly ........................... 78 
5.3  USB Type-C to USB 3.1 Standard-B Cable Assembly ........................... 79 
5.4  USB Type-C to USB 2.0 Standard-B Cable Assembly ........................... 80 
5.5  USB Type-C to USB 2.0 Mini-B Cable Assembly .................................... 81 
5.6  USB Type-C to USB 3.1 Micro-B Cable Assembly .................................. 82 
5.7  USB Type-C to USB 2.0 Micro-B Cable Assembly .................................. 84 
6  Legacy Adapter Assemblies ....................................................................................... 85 
6.1  USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly 85 
6.2  USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly ....... 87 
7  Electrical Characteristics ........................................................................................... 88 
7.1  Raw Cable (Informative) ............................................................................. 88 
7.2  USB Type-C to Type-C Passive Cable Assemblies (Normative) ....... 89 
7.3  Mated Connector (Informative – USB 3.2 Gen2 and USB4 Gen2)  108 
7.4  Mated Connector (Normative – USB4 Gen3) ...................................... 112 
7.5  USB Type-C to Legacy Cable Assemblies (Normative) .................... 113 
7.6  USB Type-C to USB Legacy Adapter Assemblies (Normative) ...... 117 
7.7  Shielding Effectiveness Requirements (Normative) ........................ 119 
7.8  DC Electrical Requirements (Normative) ........................................... 122 
8  Mechanical and Environmental Requirements (Normative) ........................ 125 
8.1  Mechanical Requirements ........................................................................ 126 
8.2  Environmental Requirements................................................................. 131 
9  Docking Applications (Informative) .................................................................... 132 
10  Implementation Notes and Design Guides ......................................................... 133 
10.1  EMC Management (Informative)............................................................ 133 
10.2  Stacked and Side-by-Side Connector Physical Spacing (Informative)
 .......................................................................................................................... 136 
10.3  Cable Mating Considerations (Informative) ....................................... 136 
Functional ................................................................................................................................ 138 
1  Signal Summary .......................................................................................................... 138 
2  Signal Pin Descriptions ............................................................................................ 138 
2.1  SuperSpeed USB Pins ................................................................................ 138 
2.2  USB 2.0 Pins ................................................................................................. 139 
2.3  Auxiliary Signal Pins .................................................................................. 139 
2.4  Power and Ground Pins ............................................................................ 139 
2.5  Configuration Pins ..................................................................................... 139 
3  Sideband Use (SBU)................................................................................................... 139 
4  Power and Ground ..................................................................................................... 140 
4.1  IR Drop........................................................................................................... 140 

Release 2.0  - 5 -  USB Type-C Cable and 
August 2019    Connector Specification 
Copyright © 2019 USB 3.0 Promoter Group. All rights reserved. 
4.2  VBUS................................................................................................................. 141 
4.3  VCONN .............................................................................................................. 143 
5  Configuration Channel (CC) .................................................................................... 147 
5.1  Architectural Overview ............................................................................ 147 
5.2  CC Functional and Behavioral Requirements .................................... 161 
5.3  USB Port Interoperability Behavior ...................................................... 197 
6  Power............................................................................................................................. 216 
6.1  Power Requirements during USB Suspend ......................................... 217 
6.2  VBUS Power Provided Over a USB Type-C Cable ............................... 218 
7  USB Hubs ...................................................................................................................... 224 
8  Power Sourcing and Charging ................................................................................ 224 
8.1  DFP as a Power Source ............................................................................. 224 
8.2  Non-USB Charging Methods .................................................................... 227 
8.3  Sinking Host ................................................................................................. 227 
8.4  Sourcing Device ........................................................................................... 227 
8.5  Charging a System with a Dead Battery .............................................. 227 
8.6  USB Type-C Multi-Port Chargers ........................................................... 228 
9  Electronically Marked Cables ................................................................................. 231 
9.1  Parameter Values ....................................................................................... 232 
9.2  Active Cables ................................................................................................ 232 
10  VCONN-Powered Accessories (VPAs) and VCONN-Powered USB Devices 
(VPDs) ........................................................................................................................... 232 
10.1  VCONN-Powered Accessories (VPAs) ..................................................... 233 
10.2  VCONN-Powered USB Devices (VPDs) ................................................... 233 
11  Parameter Values ....................................................................................................... 235 
11.1  Termination Parameters .......................................................................... 235 
11.2  Timing Parameters ..................................................................................... 237 
11.3  Voltage Parameters .................................................................................... 240 
USB4 Discovery and Entry .................................................................................................. 242 
1  Overview of the Discovery and Entry Process .................................................. 242 
2  USB4 Functional Requirements ............................................................................. 243 
2.1  USB4 Host Functional Requirements ................................................... 243 
2.2  USB4 Device Functional Requirements ............................................... 243 
2.3  USB4 Alternate Mode Support ................................................................ 243 
2.3.1  USB4 Alternate Mode Support on Hosts .............................................. 243 
2.3.2  USB4 Alternate Mode Support on Hubs and USB4-based Docks .. 243 
3  USB4 Power Requirements ..................................................................................... 244 
3.1  Source Power Requirements ................................................................... 244 
3.2  Sink Power Requirements ....................................................................... 244 
3.3  Device Power Management Requirements ......................................... 245 
4  USB4 Discovery and Entry Flow Requirements ............................................... 245 
4.1  USB Type-C Initial Connection ............................................................... 245 
4.2  USB Power Delivery Contract ................................................................. 245 
4.3  USB4 Discovery and Entry Flow ............................................................ 246 