# USB 2 Micro plug > the class of USB Micro plugs carrying only USB 1–2 and power, replaced by the USB 2 Type‑C plug **Wikidata**: [Q133873414](https://www.wikidata.org/wiki/Q133873414) **Source**: https://4ort.xyz/entity/usb-2-micro-plug ## Summary The USB 2 Micro plug is a class of legacy USB connectors designed to carry USB 1–2 data signals and power. It represents the smaller form factor that preceded the modern USB Type-C standard, encompassing specific plug types such as Micro-A and Micro-B. This class of plugs has been effectively replaced by the USB 2 Type-C plug. ## Key Facts * **Official Name:** USB 2.0 Micro plug. * **Classification:** A subclass of the USB 2 legacy plug, USB 2 Micro connector, and USB Micro plug. * **Function:** Carries only USB 1–2 data and power; it does not support the higher speeds of USB 3. * **Successor:** Replaced by the USB 2 Type-C plug. * **Variants:** The class includes the USB 2 Micro-A plug (host end) and the USB 2 Micro-B plug (peripheral device end). * **Aliases:** Known alternatively as Micro-USB 2.0 plug, Micro-USB 2 plug, USB 1 Micro plug, and Micro-USB 1.1 plug, among others. * **Distinction:** Distinct from the USB 3 Micro plug, USB Mini plug, and USB 2 Micro receptacle. ## FAQs ### Q: What is the difference between a USB 2 Micro plug and a USB 3 Micro plug? A: The USB 2 Micro plug is a class of connectors that carries only USB 1–2 data and power, whereas the USB 3 Micro plug supports higher data transfer speeds. The two are listed as distinct entities within connector taxonomies. ### Q: What specific plug shapes fall under the USB 2 Micro plug class? A: This class includes the USB 2 Micro-A plug, designed for host devices, and the USB 2 Micro-B plug, designed for peripheral devices. ### Q: Has the USB 2 Micro plug been replaced? A: Yes, the entire class of USB 2 Micro plugs has been replaced by the USB 2 Type-C plug. ## Why It Matters The USB 2 Micro plug represents a critical phase in the evolution of connectivity, serving as the industry standard for mobile and peripheral devices before the widespread adoption of USB-C. As the "legacy" class of plugs carrying USB 1–2 signals, it bridged the gap between the bulkier Mini-USB predecessors and the modern, reversible Type-C connectors. Its significance lies in its role in the miniaturization of electronics, allowing manufacturers to build thinner and lighter devices while maintaining standardized data and power delivery. Although it is now classified as a legacy technology replaced by the USB 2 Type-C plug, the USB 2 Micro plug remains one of the most recognizable connector formats in the history of consumer electronics. It serves as the parent category for the ubiquitous Micro-USB cables that charged and connected billions of smartphones, cameras, and other peripherals throughout the 2000s and 2010s. ## Notable For * **Legacy Standard:** Serving as the dominant class of USB plugs for mobile devices prior to the Type-C transition. * **Form Factor:** Being a distinct class of USB Micro plugs that is separate from Standard, Mini, and Type-C groupings. * **Ubiquity:** Existing in two primary forms (Micro-A and Micro-B) that defined host and peripheral connections for over a decade. * **Succession:** Being the immediate predecessor class to the USB 2 Type-C plug for USB 1–2 data capabilities. ## Body ### Definition and Classification The USB 2 Micro plug is defined as the class of USB Micro plugs carrying only USB 1–2 and power. It is taxonomically situated as a subclass of three broader categories: * **USB 2 Micro connector:** The general category for mechanical connectors fitting this profile. * **USB 2 legacy plug:** The wider grouping of pre-Type-C plugs supporting USB 1–2 standards. * **USB Micro plug:** The form factor class preceding USB-C, shared with Standard and Mini variations. ### Variants The USB 2 Micro plug class specifically encompasses two primary plug types: * **USB 2 Micro-A plug:** Used in host devices. * **USB 2 Micro-B plug:** Used in peripheral devices (indicated by the "B" designation). ### Replacement and Legacy The USB 2 Micro plug is officially classified as having been replaced by the USB 2 Type-C plug. While the "Micro-USB" form factor was once the standard for mobile connectivity, it is now categorized under "USB 2 legacy plug," indicating its status as a technology superseded by the universal USB Type-C standard. ### Nomenclature The official name for this entity is the **USB 2.0 Micro plug**. It is also widely recognized under numerous aliases, including Micro-USB 2.0 plug, Micro-USB 1.1 plug, USB 1 Micro plug, and USB 2.0 Micro plug. It is explicitly differentiated from the USB 3 Micro plug and the USB Mini plug. ## 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)