USB Connector
Micro-USB
Micro-USB is a small, non-reversible USB connector family widely used before USB-C.
Micro-USB characteristics
Compare its connector forms, supported standards, roles, and current status.
| Official connector family | USB Micro-A, Micro-B, and Micro-AB; SuperSpeed Micro-B |
|---|---|
| Reversible | No |
| Contact count | 5 in USB 2.0 Micro connectors; 10 in SuperSpeed Micro-B |
| USB 2.0 support | Yes |
| USB 3.x support | Yes, through the wider SuperSpeed Micro-B variant |
| USB4 support | No; USB4 uses USB Type-C |
| Typical connector role | Micro-B was commonly device-facing; Micro-A and Micro-AB supported USB On-The-Go roles |
| Typical devices | Older phones, tablets, cameras, controllers, accessories, and external drives |
| Speed identification | Standard Micro-B does not identify one data rate; SuperSpeed Micro-B is physically wider and adds SuperSpeed contacts |
| Current status | Legacy on many newer devices, but still common on older hardware and accessories |
Sources: USB-IF USB 2.0 Specification, USB-IF USB 3.2, and USB-IF Cables and Connectors.