# USB 2 Micro receptacle > the class of USB Micro receptacles carrying only USB 1–2 and power, replaced by the USB 2 Type‑C receptacle **Wikidata**: [Q133929505](https://www.wikidata.org/wiki/Q133929505) **Source**: https://4ort.xyz/entity/usb-2-micro-receptacle ## Summary The USB 2 Micro receptacle is a class of legacy USB ports designed to carry only USB 1.0 through USB 2.0 data signals and power. It represents the female connector interface found on devices, distinct from the plug, and serves as the predecessor to the modern USB 2 Type-C receptacle. This category encompasses specific variants like the Micro-AB and Micro-B receptacles, which were widely used in mobile and peripheral devices before being superseded. ## Key Facts - **Definition**: A class of USB Micro receptacles that carry only USB 1–2 data and power. - **Successor**: Replaced by the **USB 2 Type-C receptacle**. - **Parent Classifications**: Subclass of **USB 2 Micro connector**, **USB 2 legacy receptacle**, and **USB Micro receptacle**. - **Official Name**: USB 2.0 Micro receptacle. - **Variants**: Includes the **USB 2 Micro-AB receptacle** (accepts both Micro-A and Micro-B plugs) and the **USB 2 Micro-B receptacle** (used in peripheral devices). - **Differentiation**: Distinct from the USB 2 Micro plug, USB 3 Micro receptacle, and USB Mini receptacle. - **Alternative Names**: Also known as Micro-USB 2.0 receptacle, USB 1.1 Micro receptacle, and Micro-USB 1 receptacle. ## FAQs ### Q: What is the difference between a USB 2 Micro receptacle and a USB 2 Micro plug? A: The receptacle is the female port or socket mounted on a device, whereas the plug is the male connector attached to a cable. The USB 2 Micro receptacle is the specific class of fixed interfaces that accept Micro-A or Micro-B plugs. ### Q: What replaced the USB 2 Micro receptacle? A: The USB 2 Micro receptacle was replaced by the **USB 2 Type-C receptacle**. This newer standard consolidates the functionality of legacy connectors into a reversible, more universal format. ### Q: Does the USB 2 Micro receptacle support USB 3.0 speeds? A: No, this specific class of receptacles carries only USB 1–2 data and power. High-speed data transfer found in later standards requires a different class of connector, such as the USB 3 Micro receptacle. ### Q: What types of devices used the USB 2 Micro-AB receptacle? A: The USB 2 Micro-AB receptacle was designed to accept both USB 2 Micro-A and USB 2 Micro-B plugs, though it is now considered a legacy interface replaced by USB Type-C. ## Why It Matters The USB 2 Micro receptacle represents a critical era in the miniaturization of consumer electronics, serving as the standard interface for mobile phones, PDAs, and compact peripherals before the adoption of USB-C. It succeeded the larger Mini-USB connectors and enabled manufacturers to design thinner, lighter devices while maintaining reliable data and power connectivity. The transition away from this class to the USB 2 Type-C receptacle marks a significant shift in hardware design philosophy. While the Micro-USB standard helped consolidate various proprietary charging cables, it had limitations, such as non-reversible plugs and lower power delivery capabilities compared to modern standards. Its eventual replacement by the USB 2 Type-C receptacle simplified connectivity for users by introducing a reversible connector and higher power throughput, effectively ending the era of "legacy" USB shapes defined by the Standard, Mini, and Micro form factors. ## Notable For - **Legacy Classification**: It is strictly defined as a "legacy" class of receptacle, distinct from the modern Type-C standard. - **Predecessor Role**: It is the immediate predecessor class replaced by the USB 2 Type-C receptacle. - **Connector Hierarchy**: It bridges the gap between the broader "USB Micro receptacle" class and specific physical implementations like Micro-B. - **Data Limitation**: Specifically noted for carrying only USB 1–2 data speeds, distinguishing it from USB 3 variants. ## Body ### Classification and Hierarchy The **USB 2 Micro receptacle** is technically classified as a subclass of three broader entities: 1. **USB 2 Micro connector**: The general class of male and female connectors carrying USB 2 signals. 2. **USB 2 legacy receptacle**: The group of receptacles (including Standard and Mini) that preceded the USB 2 Type-C. 3. **USB Micro receptacle**: The physical form factor class preceding USB-C. ### Specific Variants The knowledge entry for USB 2 Micro receptacle encompasses specific distinct entities: * **USB 2 Micro-B receptacle**: Defined as the most compact legacy USB 2 receptacle used in peripheral devices. * **USB 2 Micro-AB receptacle**: A legacy receptacle capable of accepting both Micro-A and Micro-B plugs. ### Evolution and Replacement The primary context for this entity is its obsolescence. The **USB 2 Type-C receptacle** is explicitly identified as the replacement for this entire class of connectors. This replacement covers the functionality of carrying USB 1–2 data and power, rendering the older Micro receptacles legacy technology. ### Visual Identification According to structured data, visual representations of this class group the USB 2 Micro-AB and USB 2 Micro-B receptacles together to illustrate the "legacy USB 2 Micro receptacles." These connectors are characterized by their narrow, asymmetrical shape, requiring a specific orientation for insertion, a limitation addressed by their Type-C successors. ### Alternate Nomenclature This entity is referenced by various names in technical documentation and colloquial use, including: * USB 2.0 Micro receptacle * Micro-USB 2.0 receptacle * USB 1 Micro receptacle / USB 1.0 Micro receptacle / USB 1.1 Micro receptacle * Micro-USB 1 receptacle / Micro-USB 1.0 receptacle / Micro-USB 1.1 receptacle ## 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)