# USB 3 Standard Type-B connector > a class of legacy USB connectors that preceded USB-C (“B” indicating the peripheral device end) **Wikidata**: [Q134418903](https://www.wikidata.org/wiki/Q134418903) **Source**: https://4ort.xyz/entity/usb-3-standard-type-b-connector ## Summary The USB 3 Standard Type-B connector is a class of legacy USB connectors designed for the peripheral device end of a connection ("B" type) that preceded the adoption of USB-C. It is part of the USB 3.0 and 3.1 generations (SuperSpeed), distinguished by its distinct blue color tab and additional pins. This connector type has been effectively replaced by the USB-C standard in modern devices. ## Key Facts - **Definition**: A class of legacy USB connectors preceding USB-C, specifically indicating the "peripheral device end" of the connection. - **Successor**: The connector class has been replaced by **USB-C**. - **Speed Variants**: Aliases confirm support for various speeds, including **USB 5Gbps** (USB 3.0) and **USB 10Gbps** (USB 3.1). - **Alternate Names**: Also known as Standard USB 3.1 Type-B, USB SuperSpeed Standard Type-B, and USB SS Standard Type-B. - **Standards Body**: Governed by the **USB Implementers Forum**. - **Hierarchy**: Subclass of `USB 3 Standard connector`, `USB 3 Type-B connector`, and `USB Standard Type-B connector`. - **Related Components**: Associated with the `USB 3 Standard Type-B receptacle` (female) and `USB 3 Standard Type-B plug` (male). ## FAQs ### Q: What is the difference between a USB 3 Standard Type-B and a USB 2 Standard Type-B connector? A: While they share a similar physical profile, the USB 3 Standard Type-B connector has additional pins to support SuperSpeed data transfer rates (5Gbps or 10Gbps). It is typically identified by a blue plastic insert, whereas USB 2 versions are usually black. ### Q: Is the USB 3 Standard Type-B connector still used on new devices? A: It is considered a "legacy" class that has been replaced by USB-C. While still found on older equipment and some niche industrial peripherals, modern consumer electronics have largely transitioned to the reversible USB-C standard. ### Q: Can I plug a USB 2.0 cable into a USB 3 Standard Type-B receptacle? A: Yes, the USB 3 Standard Type-B receptacle is designed to be backward compatible. A USB 2.0 cable can be physically inserted and will function, though the data transfer speed will be limited to USB 2.0 rates. ## Why It Matters The USB 3 Standard Type-B connector represents a critical evolutionary step in wired connectivity, bridging the gap between the slower USB 2.0 era and the modern USB-C ecosystem. Before the industry converged on the reversible USB-C design, this connector was the standard interface for high-bandwidth peripherals, such as external hard drives, docking stations, and high-resolution webcams. Its significance lies in its ability to deliver "SuperSpeed" data rates (5 Gbps and later 10 Gbps) while maintaining backward compatibility with the physical form factor users recognized. This allowed for a smoother transition for consumers upgrading hardware without needing to replace all their cables immediately. Although now classified as a legacy format replaced by USB-C, this connector type facilitated the widespread adoption of high-speed external storage and data transfer, setting the performance expectations that USB-C ultimately inherited and improved upon. ## Notable For - **SuperSpeed Legacy**: Being the primary connector shape for the initial wave of SuperSpeed (5Gbps) and 10Gbps USB peripherals. - **Backward Compatibility**: Physically distinct but designed to accept USB 2.0 plugs in many receptacle configurations, extending the life of older cables. - **Specific Role**: Specifically designating the "peripheral device end" (e.g., hard drives, printers) as opposed to the host end. - **Visual Identification**: Distinct from earlier USB Standard-B connectors, often featuring a blue color-coding to indicate USB 3 support. ## Body ### Definition and Classification The **USB 3 Standard Type-B connector** is defined as a class of legacy USB connectors that preceded the USB-C standard. The "B" designation indicates its function at the peripheral device end of a cable, connecting devices such as printers or external drives to a host computer. This entity acts as a parent class for specific physical forms, including: - USB 3 Standard Type-B receptacle - USB 3 Standard Type-B plug Taxonomically, it is a subclass of the **USB 3 Standard connector**, the **USB 3 Type-B connector**, and the generic **USB Standard Type-B connector**. ### Technical Standards and Evolution Developed under the oversight of the **USB Implementers Forum**, this connector facilitated the transition to higher data transfer rates. It encompasses specifications referred to in aliases such as **USB 3.0** and **USB 3.1**, corresponding to marketing terms like **USB 5Gbps** and **USB 10Gbps**. The connector is often referred to as the **USB SuperSpeed Standard Type-B** or **USB SS Standard Type-B**. ### Replacement With the introduction of the USB Type-C specification, the USB 3 Standard Type-B connector was designated as a legacy format. Its functional role and physical interface have been superseded by **USB-C**, which offers a reversible design and higher potential performance thresholds. Consequently, the "Standard-B" form factor is increasingly rare in modern, compact electronics.