USB Connector
USB-A
USB-A is the familiar rectangular USB connector family used on computers, chargers, hubs, and accessories across legacy USB and many USB 3.x devices.
Related: SuperSpeed Standard-A · USB-A to USB-C · USB-B
Characteristics
Compare USB-A's connector form, supported USB generations, typical host role, power behavior, and the limits of identifying capability by shape alone.
| Official connector name | USB Standard-A |
|---|---|
| Reversible | No |
| USB 2.0 contact count | 4 |
| USB 3.x variant | Yes; see SuperSpeed Standard-A |
| USB generations | USB 1.x, USB 2.0, and USB 3.x |
| USB4 signaling | No; USB4 uses the USB Type-C connector |
| Typical connector role | Host or downstream-facing connection |
| Typical devices | PCs, chargers, hubs, peripherals, and accessories |
| Speed identification | The connector shape alone does not identify the supported USB data rate |
| Power capability | Depends on the USB generation and charging implementation |
USB-A articles
Explore guides about USB-A ports and cables, adapters, charging, compatibility, legacy hardware, and common connection and performance questions.
