In this article we will look at the pinout of USB 2.0, 3.0, and 3.1 connectors. The article is useful for soldering the wires in the correct order on the board or for assembling a cable.
Table of Contents
USB 2.0 connector pinout
The USB 2.0 standard uses mainly 4 lines – 2 for power and 2 for data transfer. The Mini and MicroUSB connectors have an additional ID lines for additional functions. However, the power and data cables do not use a pin ID.
USB Type-A
- VBUS – power supply.
- D- – data transmission -.
- D+ – data transmission+.
- GND – ground.
USB Type-B
- VBUS – power supply.
- D- – data transmission -.
- D+ – data transmission+.
- GND – ground.
MicroUSB
- VBUS – power supply.
- D- – data transmission -.
- D+ – data transmission+.
- ID
- GND – ground.
MiniUSB
- VBUS – power supply.
- D- data transmission –
- D+ data transmission +
- ID
- GND – ground.
USB 3.0 connector pinout
The USB 3.0 standard has 5 lines in addition to the main 4 lines for power and data transfer, of which 4 lines for USB 3.0 acceleration and one extra ground line which is not normally used. However, the USB 3.0 data lines only work when connected to a USB 3.0 compatible device, otherwise the basic USB 2.0 lines are used.
USB Type-A
- VBUS – power supply.
- D- data-
- D+ data+
- GND ground
- RX- USB 3 data reception –
- RX+ USB 3 data reception –
- GND ground, not used
- TX- USB 3 data transfer –
- TX+ USB 3 data transfer +
USB 3.1 connector pinout
In USB 3.1, the number of pins has increased and USB Type-C is the main representative of this standard. The port is versatile and suitable for a variety of tasks: accelerated data transfer, fast charging, video transfer, etc.
The Type-C connector is symmetrical and has a total of 24 contacts, 12 on each side. The contacts on the top side are numbered A1-A12. The contacts on the lower side are B1-B12 and go in reverse order.
Side A
- A1 – GND – Ground
- A2 – TX1+ – SuperSpeed+ pair 1
- A3 – TX1- – SuperSpeed- pair 1
- A4 – Vbus – Power
- A5 – CC1 – Negotiating channel
- A6 – D+ – Data transmission+
- A7 – D- – data transmission-
- A8 – SBUS1 – Additional channel
- A9 – Vbus – Power
- A10 – RX2- – SuperSpeed- pair 4
- A11 – RX2+ – SuperSpeed+ pair 4
- A12 – GND – Ground
Side B
- B12 – GND – Ground.
- B11 – RX1+ – SuperSpeed+ pair 2.
- B10 – RX1- – SuperSpeed+ pair 2.
- B9 – Vbus – Power.
- B8 – SBU2 – Additional channel.
- B7 – D- – Data transfer-.
- B6 – D+ – Data transfer+.
- B5 – CC2 – Matching channel.
- B4 – Vbus – Power.
- B3 – TX2- – SuperSpeed- pair 3.
- B2 – TX2+ – SuperSpeed+ pair 3.
- B1 – GND – Ground.
Conclusion
This article describes in detail the pinout of the 2.0, 3.0 and 3.1 standard USB connectors. The diagrams are useful for proper soldering of wires to the connector or printed circuit board, e.g. to assemble an extension cord.
Any questions? Feel free to leave a message in the comments below the article.
