Micro B Micro USB: Small Plug, Long Service
Micro-B survived longer than Mini-B because external drives adopted its 3.0 variant, and those drives are still in service.
Quick Answer
| Variant | Shape | Speed | Devices |
|---|---|---|---|
| Micro-B 2.0 | Small trapezoid, five pin | 480 Mbps | Older phones, small devices |
| Micro-B 3.0 | Wider, two stacked sections | 5 Gbps | External drives, docks |
| Micro-B 3.1 | Similar to 3.0 | 10 Gbps | Faster drives |
| Charge only cables | Any shape | None | The universal trap |
Matching the Variant
Wide socket
Accepts the 3.0 plug, which carries the extra data pins.
Narrow socket
Takes only the 2.0 plug. Forcing a 3.0 plug damages it.
Drive behaviour
A 3.0 drive on a 2.0 cable runs slowly or refuses to start if power draw exceeds the cable’s rating.
Phone era note
Micro USB phones and C phones are not interchangeable by cable alone.
Buying a Replacement
- Match the socket shape before anything else.
- Confirm data capability for any storage or sync use.
- Check the current rating for drives.
- Prefer moulded strain relief.
- Keep a tested spare for drives in daily use.
Real-World Applications
- External drive connections.
- Older phone charging and sync.
- Power banks and small devices.
- Workshop equipment.
Related Guides
For the Mini-B counterpart, read Mini B USB cable. For the B family, see USB-B cable guide. For adapter options, start with USB adapters.
FAQ
Is Micro-B the same as Mini-B?
No. Micro-B is smaller and newer.
Why is my drive slow?
A 2.0 cable on a 3.0 drive caps the speed.
Can I force a 3.0 plug into a 2.0 socket?
No. It does not fit, and forcing it damages the socket.
Why does my drive disconnect?
Power draw exceeding the cable, or a worn connector.