Standards
The voltage is 5 V (DC) for all of them.
| Year | Version | Current (max) | Power (max) | Data rate (max) | Connectors |
|---|---|---|---|---|---|
| 1996 | 1.0 | 0.1 A | 0.5 W | 12 Mb/s (FS) | AI,II, BI,II, C |
| 1998 | 1.1 | ||||
| 2000 | 2.0 | 0.5 A | 2.5 W | 480 Mb/s (HS) | AI,II, BI,II, C |
| 2008 | 3.0 1 | 0.9 A | 4.5 W | 5 Gb/s (SS) | AII, BII, C |
| 2013 | 3.1 2 | 0.9 A | 4.5 W | 10 Gb/s (SS+) | AII, BII, C |
| 2017 | 3.2 Gen 1×2 | 0.9 A | 4.5 W | 10 Gb/s (SS+) | C 3 |
| 3.2 Gen 2×2 | 20 Gb/s (SS++) |
1 Aka. USB 3.1 Gen 1 (with USB 3.1) or USB 3.2 Gen 1×1 (with USB 3.2).
2 Aka. USB 3.1 Gen 2 (with USB 3.1) or USB 3.2 Gen 2×1 (with USB 3.2).
3 An additional data lane is necessary, which is just provided with USB-C.
I Connector with 4 (A/B) or 5 (Mini-A/B, Micro-A/B) pins.
II Connector with 9 (A SS / B SS) or 10 (Micro-B SS) pins.
It’s possible to connect A and A SS, but you will loose SS. With Micro-/B it’s only possible to connect a plug with an SS socket.
FS .. Full Speed, HS … High Speed, SS … Super Speed
Power-related standards
| Name | Year / Revision | Voltage (DC) | Current (max) | Power (max) | Connectors |
|---|---|---|---|---|---|
| USB-BC 1 (Battery Charging) |
2007 / 1.0 2009 / 1.1 2010 / 1.2 |
5 V | 1.5 A | 7.5 W | A, B, C |
| USB-PD 2 (Power Delivery) |
2012 / 1.0 2014 / 2.0 2017 / 3.0 |
5 – 20 V | 5 A | 25 – 100 W | (A, B) 3, C 4 |
| 2021 / 3.1 | 5 – 48 V | 25 – 240 W |
1 Uses only the USB 1.0 pins. (Also part of newer ports.)
2 Both endpoints handle out the amount of volts to be used.
3 Using the FSK protocol (over VBUS) introduces with USB-PD Rev. 1.0.
4 Using the BMC protocol (over CC) introduces with USB-PD Rev. 2.0.
By the way ‘Quick Charge’ developed from Qualcomm isn’t an USB standard, but has been used widely.