USB 3.0 Type B Connector
9-pin rectangular connector
Standards: USB 3.0 Specification, USB 3.1 Gen 1, USB 3.2 Gen 1
What is the USB 3.0 Type B pinout?
The USB 3.0 Type B Connector has 9 pins. Pin 1 is VBUS (power). Pin 2 is D- (data). Pin 3 is D+ (data). Pin 4 is GND (ground). Plus 5 more pins.
Standards: USB 3.0 Specification, USB 3.1 Gen 1, USB 3.2 Gen 1
Pin Assignment Table
| Pin | Signal | Type | Description |
|---|---|---|---|
| 1 | VBUS | power | +5V Power (Red) - Up to 900mA for USB 3.0 |
| 2 | D- | data | USB 2.0 Data - (White) |
| 3 | D+ | data | USB 2.0 Data + (Green) |
| 4 | GND | ground | Ground (Black) |
| 5 | SSTX- | data | SuperSpeed Transmit - (to host) |
| 6 | SSTX+ | data | SuperSpeed Transmit + (to host) |
| 7 | GND_DRAIN | ground | SuperSpeed Ground/Drain Wire |
| 8 | SSRX- | data | SuperSpeed Receive - (from host) |
| 9 | SSRX+ | data | SuperSpeed Receive + (from host) |
Signal Types
Common Applications
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Use the pinout as a working reference now, then jump to the full library or the next workflow when you need it.
Map this connector into your BOM workflow →The USB 3.0 Type B connector has 9 pins: Pin 1 (VBUS, 5V), Pin 2 (D-), Pin 3 (D+), and Pin 4 (GND). Plus 5 more pins. Common in Printers and multifunction devices and Scanners.
USB 3.0 Type B Pinout Guide
USB 3.0 Type B is the device-side (upstream) connector for USB 3.0 SuperSpeed peripherals. Its unique stacked design places the 5 new SuperSpeed pins (SSTX+/-, SSRX+/-, GND_DRAIN) in an upper notch above the original 4 USB 2.0 pins (VBUS, D-, D+, GND), ensuring backward compatibility with USB 2.0 Type B plugs which fit into only the lower portion. This allows USB 2.0 devices to work with USB 3.0 ports and cables, while USB 3.0 devices can operate at USB 2.0 speeds with legacy cables. The connector supports 5 Gbps SuperSpeed data transfer and provides up to 900mA at 5V for device power.
Wiring Tips & Best Practices
The USB 2.0 section (pins 1-4) follows standard USB 2.0 wiring: VBUS (red), D- (white), D+ (green), GND (black). The USB 3.0 SuperSpeed section adds two shielded differential pairs: SSTX+/SSTX- for SuperSpeed transmit and SSRX+/SSRX- for SuperSpeed receive, plus a drain wire (GND_DRAIN) for the SuperSpeed shield. SuperSpeed pairs require controlled impedance (90 ohms differential) and should be routed as matched-length differential pairs. For reliable SuperSpeed operation, use certified USB 3.0 cables - the additional shielding and signal integrity requirements make DIY cables impractical. Maximum recommended cable length is 3 meters for passive cables at SuperSpeed.
Common Issues
Devices falling back to USB 2.0 speed typically indicates a cable issue - USB 3.0 Type B cables must have all 9 conductors properly connected. Using a USB 2.0 Type B cable in a USB 3.0 port works but limits speed to 480 Mbps. The USB 3.0 Type B plug does NOT fit into USB 2.0 Type B receptacles due to the larger form factor - only USB 2.0 plugs fit both receptacle types. Intermittent SuperSpeed connections often result from poor cable quality or damaged connectors. Some older USB 3.0 host controllers have compatibility issues with certain devices - try different USB 3.0 ports or update drivers.
Why Use Interactive Diagrams?
- Accuracy: Hover over pins to see exact signal names and descriptions
- Clarity: Color-coded by signal type (power, ground, data)
- Printable: Export clean diagrams for shop floor reference