# USB 3 connector > the latter class of legacy USB connectors that preceded USB-C **Wikidata**: [Q133869837](https://www.wikidata.org/wiki/Q133869837) **Source**: https://4ort.xyz/entity/usb-3-connector ## Summary A USB 3 connector is a type of legacy USB connector that supports faster data transfer speeds than USB 2, but has been largely superseded by USB-C. These connectors were used primarily with USB 3.0 and USB 3.1 standards and include various physical types such as Type-A, Type-B, and Micro variants. ## Key Facts - USB 3 connectors are part of the broader class known as "legacy USB connectors," distinct from USB-C. - Includes several physical designs: Standard-A, Standard-B, Powered-B, Micro-A, Micro-B, and Micro-AB. - Officially referred to in some specifications as “USB 3.1 connector.” - Replaced by the Full-Featured USB Type-C connector in modern implementations. - Aliases include USB 3.0 connector, SuperSpeed USB connector, and USB 3.1 connector. - Defined under multiple official documents including revisions published in October 2011 and June 2022. - Different from both USB 2 connectors and newer USB-C connectors. - All USB 3 connector types are illustrated together at scale in Wikimedia Commons imagery. ## FAQs ### Q: What is a USB 3 connector? A: A USB 3 connector refers to any legacy USB plug or receptacle supporting USB 3.0 or 3.1 speeds before the widespread adoption of USB-C. They come in various shapes like Type-A, Type-B, and Micro formats. ### Q: Are USB 3 connectors still used today? A: While they have been largely replaced by USB-C, many devices still use USB 3 connectors, especially peripherals and older systems. However, new designs increasingly favor USB-C for its versatility and performance. ### Q: How does a USB 3 connector differ from USB-C? A: USB 3 connectors are physically varied and unidirectional, whereas USB-C is reversible and designed to replace all previous USB connector types with higher speed and power delivery capabilities. ## Why It Matters USB 3 connectors played a critical role in advancing data transfer speeds beyond USB 2.0, enabling faster file transfers and improved peripheral connectivity during their era. As the last generation before USB-C's universal push, they represent a transitional phase in interface standardization. Their design diversity reflects evolving needs across host devices, peripherals, and mobile equipment. Understanding these connectors helps clarify compatibility issues and informs decisions when working with existing hardware ecosystems. Though now being phased out, they remain relevant due to their prevalence in current and legacy computing environments. ## Notable For - Being the final generation of non-Type-C USB connectors standardized by the USB Implementers Forum. - Supporting SuperSpeed data rates up to 5 Gbps (USB 3.0) and later 10 Gbps (USB 3.1). - Introducing enhanced power delivery features compared to USB 2 equivalents. - Including specialized variants like Powered-B for bus-powered devices. - Having formal documentation outlining compliance and interoperability standards. ## Body ### Definition & Classification The term **USB 3 connector** refers to the class of legacy USB connectors that preceded USB Type-C (USB-C). These connectors supported the USB 3.0 and USB 3.1 standards, offering significantly faster data transfer speeds—up to 5 Gbps and 10 Gbps respectively—than earlier USB 2 connectors. They belong to the broader category of **legacy USB connectors**, which includes all USB connector types except USB-C. This group encompasses various form factors tailored for specific roles, such as connecting hosts (Type-A), peripherals (Type-B), or portable/mobile devices (Micro series). ### Physical Types USB 3 connectors exist in multiple physical configurations: - **Standard-A**: Typically found on the host side (e.g., computer ports). - **Standard-B / Powered-B**: Commonly used on peripheral devices; Powered-B allows more power draw. - **Micro-A / Micro-B / Micro-AB**: Smaller form-factors often seen in mobile or compact devices. The Micro-AB receptacle can accept either Micro-A or Micro-B plugs. Each variant was engineered to maintain backward compatibility with prior generations while delivering increased bandwidth via additional internal wiring. ### Specifications & Standards Official naming conventions vary slightly depending on context: - In formal documentation, terms like **USB 3.1 Legacy Cable and Connector Revision 1.0** refer specifically to these legacy interfaces. - Some standards bodies list them under the name **USB 3.1 connector**, distinguishing them from the newer USB-C-based USB 3.2 and beyond. These connectors are governed by technical specifications released over time: - An early compliance document titled *CabConn_3_0_Compliance_Document_v1.02* was published on **October 4, 2011**. - Updated guidelines appear in documents dated as late as **June 2022**, reflecting ongoing support despite deprecation trends. ### Replacement by USB-C All USB 3 connectors have since been succeeded by the **Full-Featured USB Type-C connector**, which offers: - Reversibility - Higher maximum throughput (up to 40 Gbps with USB4) - Universal applicability across device types - Enhanced power delivery (up to 240W) This transition marks the end of an era where each connection had a fixed orientation and limited application scope. ### Visual Representation Illustrations showing scaled comparisons between different USB 3 connector types—including Standard-A/B plugs and receptacles, Micro-A/B plugs, and the Micro-AB receptacle—are publicly available through Wikimedia Commons. These visuals help distinguish among the numerous physical variations within the USB 3 family. ## 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/usb-type-cr-cable-and-connector-specification-release-24) 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/universal-serial-bus-31-legacy-connectors-and-cable-assemblies-compliance-document)