USB Micro-A to Micro-B Cable: What It Connects and When
Quick answer / TL;DR: A Micro-A to Micro-B cable runs between a Micro-A port (rare – found on small USB hubs, some adapters and a few industrial devices) and a Micro-B device (external drives, cameras, routers). Buy it only when the host side is Micro-A; for a computer's USB-A port, the normal USB-A to Micro-B cable is the correct part.
A Micro-A to Micro-B cable is the least common of the small-connector data cables: one end is a Micro-A plug, the other a standard Micro-B. Both ends are small, which is exactly why the cable confuses people – and why it exists at all. It is made for the one case the common A-to-Micro-B cable cannot cover.
This guide identifies the two connector shapes, explains where a Micro-A port actually lives, and tells you when this cable is the right part.
The Two Shapes at Each End
Micro-B is the familiar trapezoid with a locking bar – the plug on most external drives and cameras. Micro-A is the slimmer, more rectangular sibling with the same 180-degree lock, and it is the port style used where a device needs a small hub-style socket. Only five pins carry the USB 2.0 signal on either; the pairing is mechanical, not electrical – the cable exists to bridge two small-socket devices.
| End | Connector | Typical home |
|---|
| A-side of this cable | Micro-A plug | Small hubs, some adapters, embedded host ports |
| B-side | Micro-B plug | External drives, cameras, routers, medical and lab gear |
Where a Micro-A Port Actually Lives
- Compact USB hubs with Micro-A input (the hub's own upstream port)
- Adapter dongles that fan out from a small host socket
- Some embedded and industrial host boxes that save depth with a Micro-A receptacle
- Occasional camera and instrument accessories
Computers do not carry Micro-A ports – that is a host-side style reserved for small hub and adapter form factors. If the cable's A end would plug into a computer, you have a different cable in mind: USB-A to Micro-B.
Micro-A to Micro-B vs the Common A-to-Micro-B
| Need | Correct cable |
|---|
| Computer or power bank to an external drive | USB-A to Micro-B |
| Small hub's Micro-A input to a drive or camera | Micro-A to Micro-B (this cable) |
| Any 5 Gbps data | Neither – both are 480 Mbps class |
Real-World Applications
Bench and embedded work
An embedded host box with a Micro-A upstream port feeds a reference drive or a programmer through this cable, keeping the whole chain small-socket and panel-friendly.
Camera and accessory chains
A field camera accessory with a Micro-A socket chains to a secondary camera or drive over the Micro-B end – the cable that keeps the accessory stack compact.
Hub expansion in tight enclosures
A small hub with a Micro-A input sits inside an enclosure and drives a remote sensor pack through this cable to its Micro-B port.
Per-SKU pinouts and cable ratings are not provided in the knowledge base; confirm the connector part number before ordering for a specific build.
Related reading: The common cable this one replaces? Read the USB-A to Micro-B guide — type-a-to-micro-b-cable
Related reading: Telling the small shapes apart? See the Micro-A vs Micro-B identification guide — micro-a-vs-micro-b
Related reading: Browse USB cables — usb-cables
Frequently Asked Questions
What is a Micro-A to Micro-B cable used for?
Connecting a device with a Micro-A host-style port – usually a small hub or adapter – to a Micro-B device such as an external drive or camera. It is a niche part, not a replacement for the standard A-to-Micro-B cable.
Is it faster than a normal USB-A to Micro-B cable?
No. Both are 480 Mbps-class (USB 2.0) data cables. The difference is the connector at the host end, not the speed.
Can I plug a Micro-A cable into my computer?
Usually not – computers carry USB-A or USB-C ports, not Micro-A. Micro-A is a port style for small hubs and adapters.
How do I check which one I need?
Look at the port the host device uses: rectangular and slim with a center bar is Micro-A; the wider trapezoid is Micro-B. Match the host side first, then the device side.
Need a spec-matched hub, cable or adapter for a project? Our engineering and B2B sales team provides datasheets, compatibility notes and volume pricing. Browse the full product list, or review our certifications and test reports before you specify.
