# USB Standard-A receptacle > class of legacy USB receptacles (host end) that preceded USB-C **Wikidata**: [Q133871404](https://www.wikidata.org/wiki/Q133871404) **Source**: https://4ort.xyz/entity/usb-standard-a-receptacle ## Summary USB Standard-A receptacle is a class of legacy USB receptacles used as host end connectors that preceded USB-C. It represents the standard USB-A connection interface commonly found on computers and chargers for many years before the more modern USB-C became widespread. ## Key Facts - USB Standard-A receptacle is classified as a legacy USB interface that preceded USB-C - It belongs to the USB Standard-A connector class and is specifically designed for host ends - The official name is "USB Standard-A receptacle" according to USB.org documents - It is a subclass of both USB Standard-A connector and USB Type-A receptacle - Related entities include USB 3 Standard-A receptacle and USB 2 Standard-A receptacle - The receptacle has Wikimedia Commons documentation showing its design - It is different from the USB Standard-A plug, USB Standard-B receptacle, and USB Mini-A receptacle - It is referenced in USB compliance documents from dates including 2022 and 2025 ## FAQs ### Q: What is the primary use of USB Standard-A receptacle? A: USB Standard-A receptacle is used as a host end connector, typically found on computers, chargers, and other devices to receive USB-A plugs for data transfer and power supply. ### Q: When was USB Standard-A receptacle commonly used? A: USB Standard-A receptacle was the standard interface for many years before USB-C gained popularity, with its usage continuing alongside newer standards as a legacy interface. ### Q: How does USB Standard-A receptacle differ from USB-C? A: Unlike the reversible and versatile USB-C, USB Standard-A receptacle has a rectangular shape and only one orientation for connection, representing an older standard with fewer capabilities. ### Q: Is USB Standard-A receptacle still relevant today? A: While newer technologies have emerged, USB Standard-A receptacle remains relevant as a legacy interface with widespread compatibility for many existing devices and accessories. ## Why It Matters USB Standard-A receptacle represents a foundational technology in the evolution of universal connectivity. For over two decades, it served as the primary interface for connecting countless devices to computers and power sources. Its standardization enabled unprecedented interoperability between manufacturers, creating a universal connection method that simplified user experience across the electronics industry. Despite being largely replaced by USB-C in newer devices, USB Standard-A receptacle continues to be found in billions of deployed systems worldwide, ensuring backward compatibility and maintaining access to vast ecosystems of existing peripherals. This legacy connector underscores the importance of standardized interfaces in the history of consumer electronics and remains a vital component in maintaining connectivity across multiple generations of technology. ## Notable For - Served as the dominant USB connection interface for over two decades before USB-C became standard - Established the rectangular host-end form factor that became universally recognized in consumer electronics - Provided the foundation for the USB-A connection standard that ensured cross-manufacturer compatibility - Maintains relevance as a legacy interface even as newer USB standards emerge - Continues to be referenced in current USB compliance documentation, indicating its enduring importance ## Body ### Overview USB Standard-A receptacle is a class of legacy USB receptacles specifically designed for host ends. It preceded USB-C as the standard connection interface for many years. The "A" designation specifically indicates it is meant for host ends (computers, chargers) rather than device ends (peripherals, phones). ### Classification and Relationships - Classified as part of the USB Standard-A connector class - Also belongs to the USB Type-A receptacle class and USB Standard receptacle class - Related to USB 3 Standard-A receptacle and USB 2 Standard-A receptacle as specific implementations - Differentiated from USB Standard-A plug (the male connector), USB Standard-B receptacle, and USB Mini-A receptacle ### Official Documentation - Official name recognized by USB.org as "USB Standard-A receptacle" - Referenced in USB compliance documents including USB 3.1 Legacy Cable and Connector Revision 1.0 - Documentation dates include June 2022 (USB 3.2 Revision 1.1) and May 2025 - Officially categorized under "USB Standard-A receptacles" in Wikimedia Commons ### Design and Implementation - Features a rectangular form factor that distinguishes it from other USB connector types - Designed for host-side connections (computers, chargers, hubs) - Maintains backward compatibility across multiple USB generations despite newer standards - Continues to be widely used despite USB-C emergence due to existing infrastructure and device bases ### Legacy Status - Recognized as a legacy interface that preceded USB-C - Maintains relevance through billions of existing systems and peripherals - Continues to be supported in current USB standards to ensure backward compatibility - Serves as an important connection method for legacy systems and applications ## 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)