# USB 2 Micro connector

> the class of USB Micro connectors carrying only USB 1–2 and power, replaced by the USB 2 Type‑C connectors

**Wikidata**: [Q133873422](https://www.wikidata.org/wiki/Q133873422)  
**Source**: https://4ort.xyz/entity/usb-2-micro-connector

## Summary
The USB 2 Micro connector is a legacy USB connector designed for data transfer (USB 1–2 speeds) and power delivery, widely used in mobile devices before being replaced by the USB 2 Type-C connector. It belongs to the Micro-USB class and improved upon earlier Mini-USB designs with its compact size. Officially named the USB 2.0 Micro connector, it supported backward compatibility with USB 1.0 and 1.1 standards.

## Key Facts
- **Official Name**: USB 2.0 Micro connector (documented in USB-IF specifications).  
- **Replaced**: Mini-USB connectors due to its smaller form factor.  
- **Replaced By**: USB 2 Type-C connector, which offers faster speeds and reversible design.  
- **Subclass Of**: USB 2 legacy connector and Micro-USB.  
- **Aliases**: Includes USB 1.0/1.1/2.0 Micro, reflecting backward compatibility with earlier USB standards.  
- **Documentation**: Specified in the USB 2.0 Specification and related USB-IF documents (e.g., *USB 3.1 Legacy Cable and Connector Revision 1.0*).  
- **Design Variants**: Includes Micro-A, Micro-B, and Micro-AB receptacles for device-specific connections.  

## FAQs
### Q: What devices commonly used USB 2 Micro connectors?
A: The USB 2 Micro connector was widely adopted in smartphones, tablets, e-readers, and other portable electronics before the USB-C transition.  

### Q: Why was USB 2 Micro replaced by USB-C?
A: USB-C provides higher speed capabilities (up to USB 3.2/4.0), reversible plug design, and multi-purpose use (data, power, video), making it more versatile than the legacy Micro connector.  

### Q: Is USB 2 Micro compatible with USB 3 devices?
A: No—USB 3 Micro connectors exist separately, but USB 2 Micro only supports up to USB 2.0 speeds (480 Mbit/s) and lacks the additional pins required for USB 3.0/3.1.  

## Why It Matters
The USB 2 Micro connector played a critical role in standardizing compact, durable USB connections for mobile devices in the 2000s–2010s. It addressed the size and fragility limitations of earlier Mini-USB connectors, enabling thinner, more robust designs for smartphones and tablets. As a widely adopted standard, it ensured interoperability across devices and chargers, reducing consumer confusion. However, its limited bandwidth (USB 2.0 speeds) and non-reversible design led to its eventual replacement by USB-C, which supports faster data transfer, higher power delivery, and bi-directional insertion. The USB 2 Micro connector remains relevant in legacy systems but is phased out in modern devices.

## Notable For
- **Compact Design**: The smallest legacy USB 2 connector, enabling thinner mobile devices.  
- **Backward Compatibility**: Supported USB 1.0/1.1/2.0 standards, ensuring broad device interoperability.  
- **Micro-AB Receptacle**: Allowed a single port to accept both Micro-A and Micro-B plugs (e.g., for OTG hosting).  
- **Widespread Adoption**: Dominated mobile device charging and data transfer for over a decade.  
- **Distinct from USB 3 Micro**: Lacked the additional pins and shielding required for USB 3.0 speeds.  

## Body

### Overview
The USB 2 Micro connector, officially termed the **USB 2.0 Micro connector**, is a subclass of the **USB 2 legacy connector** and **Micro-USB** classes. It was designed for peripheral devices, emphasizing compact size and durability over earlier Mini-USB connectors. The connector supported USB 1.0 (Low/Full Speed), USB 1.1, and USB 2.0 (High Speed) protocols, with a maximum data rate of 480 Mbit/s.  

### Technical Specifications
- **Data Transfer**: Up to USB 2.0 High Speed (480 Mbit/s).  
- **Power Delivery**: Standard USB 2.0 power levels (2.5–5 W).  
- **Design Variants**:  
  - **Micro-A**: Typically used for "host" devices (e.g., PCs).  
  - **Micro-B**: Used for peripheral devices (e.g., smartphones).  
  - **Micro-AB**: A hybrid receptacle accepting both Micro-A and Micro-B plugs.  
- **Dimensions**: Smaller than Mini-USB, with a 2.0 mm × 7.0 mm footprint.  

### History and Obsolescence
- **Introduction**: Standardized in the USB 2.0 specification (released in 2000, revised in 2007).  
- **Replacement of Mini-USB**: Became the dominant connector for mobile devices by the late 2000s.  
- **Deprecation**: Officially replaced by **USB 2 Type-C** in newer USB-IF specifications (e.g., USB 3.2 and USB4).  
- **Legacy Use**: Still found in older devices but largely phased out in favor of USB-C, which offers backward compatibility with USB 2.0 speeds via "Legacy Mode."  

### Documentation
The connector is detailed in USB-IF documents such as:  
- *USB 2.0 Specification* (https://www.usb.org/document-library/usb-20-specification)  
- *USB 3.1 Legacy Cable and Connector Revision 1.0* (https://www.usb.org/document-library/usb-31-legacy-cable-and-connector-revision-10)  

### Visual Identification
![USB 2 Micro connectors](https://commons.wikimedia.org/wiki/Special:FilePath/USB_connector_illustration,_to_scale,_grouping,_legacy,_USB_2_Micro.svg)  
*Illustration showing USB 2 Micro-A plug, Micro-AB receptacle, and Micro-B variants.*

## References

1. [Source](https://www.usb.org/document-library/usb-31-legacy-cable-and-connector-revision-10)
2. [Source](https://www.usb.org/document-library/universal-serial-bus-31-legacy-connectors-and-cable-assemblies-compliance-document)
3. [Source](https://www.usb.org/document-library/usb-32-revision-11-june-2022)
4. [Source](https://www.usb.org/document-library/usb-type-cr-connectors-and-cable-assemblies-compliance-document-rev-21b)
5. [Source](https://www.usb.org/document-library/usb-type-cr-cable-and-connector-specification-release-24)