USB 3.x size
USB 3.x
5, 10 or 20 Gbit/s depending on generation
This is the family where the naming became genuinely misleading. USB 3.0 (5 Gbit/s) was renamed USB 3.1 Gen 1, then USB 3.2 Gen 1, without the hardware changing at all. 10 Gbit/s is Gen 2, and 20 Gbit/s is Gen 2×2. A device advertised as "USB 3.2" may be any of the three. The USB-IF now recommends marketing by speed — "USB 5Gbps", "USB 10Gbps" — precisely because the version numbers stopped carrying information.
The numbers
- Specification
- 5, 10 or 20 Gbit/s depending on generation
- Defined by
- USB-IF
The same physical port and cable can be any of these speeds. Version numbers alone do not tell you which.
USB
| Size | Millimetres | Inches |
|---|---|---|
| USB-C connector | 8.34 × 2.56 mm | 0.33 × 0.10 |
| USB 3.x ← | 5, 10 or 20 Gbit/s depending on generation | — |
| USB 2.0 | 480 Mbit/s, 2.5 W (500 mA at 5 V) | — |
| USB4 | 20, 40 or 80 Gbit/s; USB-C connector only | — |
Common questions
- What size is USB 3.x?
- 5 Gbit/s originally, renamed repeatedly — check the speed, not the name.
- Which standard defines USB 3.x?
- USB-IF
Related pages
- USB-C connector size 8.34 × 2.56 mm
- USB 2.0 size 480 Mbit/s, 2.5 W (500 mA at 5 V)
- USB4 size 20, 40 or 80 Gbit/s; USB-C connector only
Sources
- Official vendor product documentation — At One Place