USB 3.0 is the third major version of the Universal Serial Bus (USB) standard for interfacing computers and electronic devices. USB 3.0 combines USB 2.0 bus and new SuperSpeed bus with transfer rate up to 5.0 Gbit/s, which is about ten times faster than the USB 2.0 standard. USB 3.0 connectors are usually distinguished from their USB 2.0 counterparts by blue color-coding of the receptacles and plugs.
USB 3.1 is the successor standard (USB 3.1 Gen 2), was released in July 2013 with the new transfer mode SuperSpeed+ that can transfer data at up to 10 Gbit/s (1.25 GB/s, twice the rate of USB 3.0).
Communication is full-duplex during SuperSpeed. In the compatibility mode (USB 1.0 or USB 2.0) communication is half-duplex, with direction controlled by the host.
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| Pin | Name | Direction | Color | Description |
|---|---|---|---|---|
| 1 | VBUS | red | +5 V power | |
| 2 | D- | ←→ | white | USB 2.0 Data – |
| 3 | D+ | ←→ | green | USB 2.0 Data + |
| 4 | GND | black | Ground | |
| 5 | StdA_SSRX- | ← | blue | SuperSpeed receiver |
| 6 | StdA_SSRX+ | ← | yellow | SuperSpeed receiver |
| 7 | GND_DRAIN | ground | Ground | |
| 8 | StdA_SSTX- | → | purple | SuperSpeed transmitter |
| 9 | StdA_SSTX+ | → | orange | SuperSpeed transmitter |
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| Pin | Name | Direction | Color | Description |
|---|---|---|---|---|
| 1 | VBUS | red | +5 V power | |
| 2 | D- | ←→ | white | USB 2.0 Data – |
| 3 | D+ | ←→ | green | USB 2.0 Data + |
| 4 | GND | black | Ground | |
| 5 | StdB_SSTX- | → | blue | SuperSpeed transmitter |
| 6 | StdB_SSTX+ | → | yellow | SuperSpeed transmitter |
| 7 | GND_DRAIN | ground | Ground | |
| 8 | StdB_SSRX- | ← | purple | SuperSpeed receiver |
| 9 | StdB_SSRX+ | ← | orange | SuperSpeed receiver |
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| Pin | Name | Direction | Color | Description |
|---|---|---|---|---|
| 1 | VBUS | red | +5 V power | |
| 2 | D- | ←→ | white | USB 2.0 Data – |
| 3 | D+ | ←→ | green | USB 2.0 Data + |
| 4 | ID | any | OTG ID | |
| 5 | GND | black | Ground | |
| 6 | StdB_SSTX- | → | blue | SuperSpeed transmitter |
| 7 | StdB_SSTX+ | → | yellow | SuperSpeed transmitter |
| 8 | GND_DRAIN | ground | Ground | |
| 9 | StdB_SSRX- | ← | purple | SuperSpeed receiver |
| 10 | StdB_SSRX+ | ← | orange | SuperSpeed receiver |