USB 3.0 combines USB 2.0 bus and new SuperSpeed bus with transfer rate up to 5.0 Gbit/s.
Pinout of Standard-A USB 3.0 connector
Pin Number |
Pin Name |
Description (may be empty) |
1 | VBus | +5V Power |
2 | USB D- | USB 2.0 data |
3 | USB D+ | |
4 | GND | Ground for power return |
5 | StdA_SSRX- | SuperSpeed recevier |
6 | StdA_SSRX+ | SuperSpeed recevier |
7 | GND_DRAIN | Ground for signal return |
8 | StdA_SSTX- | SuperSpeed transmitter |
9 | StdA_SSTX+ | SuperSpeed transmitter |
Pinout of Standard-B USB 3.0 connector
Pin Number |
Pin Name |
Description (may be empty) |
1 | VBus | +5V Power |
2 | USB D- | USB 2.0 data |
3 | USB D+ | |
4 | GND | Ground for power return |
8 | StdA_SSRX- | SuperSpeed recevier |
9 | StdA_SSRX+ | SuperSpeed recevier |
7 | GND_DRAIN | Ground for signal return |
5 | StdA_SSTX- | SuperSpeed transmitter |
6 | StdA_SSTX+ | SuperSpeed transmitter |
Pinout of Powered-B USB 3.0 connector
Pin Number |
Pin Name |
Description (may be empty) |
1 | VBus | +5V Power |
2 | USB D- | USB 2.0 data |
3 | USB D+ | |
4 | GND | Ground for power return |
8 | StdA_SSRX- | SuperSpeed recevier |
9 | StdA_SSRX+ | SuperSpeed recevier |
7 | GND_DRAIN | Ground for signal return |
5 | StdA_SSTX- | SuperSpeed transmitter |
6 | StdA_SSTX+ | SuperSpeed transmitter |
10 | DPWR | Power provided by device |
11 | DGND | Ground return for DPWR |
A new feature is the SuperSpeed bus, which provides a fourth transfer mode at 5.0 Gbit/s. The raw throughput is 4 Gbit/s, and the specification considers it reasonable to achieve 3.2 Gbit/s (0.4 Gbyte/s or 400 MByte/s), or more, after protocol overhead.
USB 3.0 receptacles are backward compatible with USB 2.0 connectors.