# USB 3 Type-B receptacle > a class of legacy (pre-C) USB Type-B (peripheral device end) receptacles **Wikidata**: [Q133871758](https://www.wikidata.org/wiki/Q133871758) **Source**: https://4ort.xyz/entity/usb-3-type-b-receptacle ## Summary The USB 3 Type-B receptacle is a class of legacy physical connectors located on the peripheral device end of a USB cable, designed to interface with USB 3.0, 3.1, and SuperSpeed protocols. It represents the specific socket or port format that preceded the modern USB-C standard. This connector class is distinct from earlier USB 2.0 versions and the Standard-A receptacles found on host computers. ## Key Facts - **Classification:** It is a subclass of the USB 3 Type-B connector, the USB 3 receptacle, and the broader USB Type-B receptacle family. - **Function:** "Type-B" specifically indicates that this receptacle is designed for the peripheral device end of a connection, rather than the host end. - **Status:** It is categorized as a "legacy" connector, meaning it predates the current USB-C standard. - **Aliases:** It is also known as the USB 3.0 Type-B receptacle, USB-B 3.1 receptacle, and SuperSpeed USB Type-B receptacle. - **Variants:** This class encompasses specific form factors, including the USB 3 Standard-B receptacle, the USB Powered-B receptacle, and the USB 3 Micro-B receptacle. - **Differentiation:** It is structurally and functionally distinct from the USB 3 Type-B plug (which inserts into it), the USB 3 Standard-A receptacle (the host end), and the older USB 2 Type-B receptacle. ## FAQs ### Q: What is the primary use of a USB 3 Type-B receptacle? A: This receptacle is found on peripheral devices, such as external hard drives or printers, serving as the input port for the device end of a USB 3 connection. ### Q: Is the USB 3 Type-B receptacle the same as USB-C? A: No. The USB 3 Type-B receptacle is explicitly classified as a "legacy" (pre-C) connector. It represents an older generation of USB hardware that physically differs from the smaller, reversible USB-C standard. ### Q: Can I plug a USB 2.0 cable into a USB 3 Type-B receptacle? A: While the source material defines the USB 3 Type-B receptacle as "different from" the USB 2 Type-B receptacle, it identifies the entity strictly as a class of USB 3 connectors designed for SuperSpeed data transfer. ### Q: What does "SuperSpeed" mean in this context? A: "SuperSpeed" is a designation found in the aliases for this connector class (e.g., SuperSpeed USB Type-B receptacle), indicating its capability to handle the higher data transfer rates associated with the USB 3.0/3.1 standards. ## Why It Matters The USB 3 Type-B receptacle played a critical role in the transition of peripheral connectivity from the slower USB 2.0 standard to high-speed data transfer. Before the widespread adoption of the universal USB-C connector, this class of receptacles was the industry standard for connecting high-bandwidth devices, such as external solid-state drives, high-resolution webcams, and docking stations. Its significance lies in its ability to facilitate "SuperSpeed" data transmission for peripherals while maintaining the distinct "Type-B" geometry that prevented users from incorrectly looping a host connection back into a host port. Although now considered a legacy format superseded by USB-C, millions of these ports remain in active use in industrial, professional, and consumer electronics. It serves as a key historical marker in the evolution of the USB standard, representing the era where data speeds increased significantly before the physical interface was eventually unified under USB-C. ## Notable For - **Peripheral-Side Design:** Specifically engineered for the device end of the connection, distinguishing it from the host-side Standard-A receptacles. - **Legacy Classification:** Being the immediate predecessor to USB-C in the Type-B form factor lineage. - **SuperSpeed Capabilities:** Providing the physical interface required for USB 3.0 and 3.1 data rates (SuperSpeed). - **Multiple Form Factors:** Existing in Standard-B, Powered-B, and Micro-B sizes to accommodate different classes of peripheral devices. ## Body ### Classification and Hierarchy The USB 3 Type-B receptacle is a defined class of connectors within the USB taxonomy. It is taxonomically situated as a subclass of three broader categories: * **USB 3 Type-B connector:** The general class of peripheral-side USB 3 plugs and receptacles. * **USB 3 receptacle:** The specific socket component of USB 3 technology. * **USB Type-B receptacle:** The overarching legacy family of peripheral-side sockets that existed prior to USB-C. ### Physical Variants The "USB 3 Type-B receptacle" class serves as an umbrella for several specific connector shapes designed for different device profiles. According to structured data and visual illustrations associated with this entity, the class includes: * **USB 3 Standard-B receptacle:** The full-sized version typically found on larger peripherals like printers and desktop external drives. * **USB Powered-B receptacle:** A variant that includes additional pins for power delivery. * **USB 3 Micro-B receptacle:** A smaller iteration designed for mobile devices and compact external drives. ### Distinguishing Features This connector class is defined by what it is *not*, as much as by what it is. Structured properties explicitly list it as **different from**: * **USB 3 Type-B plug:** The male counterpart that inserts into this receptacle. * **USB 3 Standard-A receptacle:** The standard rectangular port found on computers (the host). * **USB 2 Type-B receptacle:** The predecessor technology which physically differed to prevent high-speed cables from being used on low-speed controllers (though backward compatibility often existed).