# PCI Express Mini Card > form factor for small PCI Express and USB expansion cards **Wikidata**: [Q20825962](https://www.wikidata.org/wiki/Q20825962) **Source**: https://4ort.xyz/entity/pci-express-mini-card ## Summary The PCI Express Mini Card is a form factor designed for small PCI Express and USB expansion cards. It functions as a type of expansion card, which is a circuit board that connects to a computer system to add functionality. This standard succeeded the Mini PCI form factor and was later succeeded by M.2. ## Key Facts * **Instance Of:** Form factor * **Subclass Of:** Expansion card * **Uses:** PCI Express, USB 2.0, System Management Bus * **Standards Body:** PCI-SIG * **Follows:** Mini PCI * **Followed By:** M.2 * **Aliases:** Mini PCI Express, Mini PCIe, Mini PCI-E, mPCIe, PEM * **Different From:** M.2, mSATA ## FAQs ### Q: What is a PCI Express Mini Card? A: A PCI Express Mini Card is a specific form factor used for small expansion cards that utilize either PCI Express or USB interfaces. It is a type of expansion card designed to add various functionalities to computer systems. ### Q: What is the primary purpose of a PCI Express Mini Card? A: The primary purpose of a PCI Express Mini Card is to provide a standardized, compact way to integrate additional features into computer systems. It allows for the connection of expansion cards that leverage PCI Express, USB 2.0, or System Management Bus for communication. ### Q: What standards did the PCI Express Mini Card replace, and what standard replaced it? A: The PCI Express Mini Card followed and largely replaced the Mini PCI standard, which was used for small PCI expansion cards. It was subsequently followed and largely replaced by the M.2 standard for newer, more compact expansion needs. ### Q: What are some common alternative names for PCI Express Mini Card? A: Common alternative names and aliases for PCI Express Mini Card include Mini PCI Express, Mini PCIe, Mini PCI-E, mPCIe, and PEM. These terms are often used interchangeably to refer to the same form factor. ## Why It Matters The PCI Express Mini Card played a significant role in the evolution of compact computing by providing a standardized, small form factor for internal expansion. Before its introduction, integrating additional features like Wi-Fi or other peripherals into laptops and small-form-factor PCs often required proprietary solutions or larger expansion slots. The PCI Express Mini Card standardized this process, allowing manufacturers to design modular systems where components could be easily added, upgraded, or replaced. By supporting both PCI Express and USB 2.0 interfaces, it offered versatility for a wide range of expansion cards, from wireless network adapters to other specialized functions. Its standardization by the PCI-SIG ensured interoperability and reliability across different hardware platforms. As a successor to Mini PCI and a predecessor to M.2, it represents a crucial step in the continuous drive towards smaller, more efficient, and modular computer hardware, enabling the development of increasingly compact and capable devices. ## Notable For * Being a compact form factor specifically designed for both PCI Express and USB expansion cards. * Serving as the direct successor to the Mini PCI standard for small expansion cards. * Acting as the predecessor to the M.2 standard, which further miniaturized expansion card technology. * Its standardization by the PCI-SIG, ensuring industry-wide compatibility and adoption. * Supporting multiple key interfaces, including PCI Express, USB 2.0, and System Management Bus, for diverse functionality. ## Body ### Definition and Classification The PCI Express Mini Card is defined as a **form factor**. It is specifically designed for **small PCI Express and USB expansion cards**. As a **subclass of expansion card**, its fundamental purpose is to enable the addition of functionality to computer systems. An expansion card is generally understood as a circuit board that can be connected to a computer system to enhance its capabilities. ### Technical Specifications and Interfaces The PCI Express Mini Card utilizes several key interfaces for communication and operation: * **PCI Express** * **USB 2.0** * **System Management Bus** This form factor is standardized by the **PCI-SIG**, an industry organization responsible for maintaining the PCI Express specification. ### Naming and Aliases The PCI Express Mini Card is known by several aliases, reflecting its common usage and various abbreviations: * Mini PCI Express * Mini PCIe * Mini PCI-E * mPCIe * PEM ### Evolution and Successors The PCI Express Mini Card represents an evolutionary step in computer expansion card technology: * It **follows** the **Mini PCI** standard, which was a form factor for small PCI expansion cards. * It is **followed by** the **M.2** standard, which further advanced compact expansion card design. * It is distinct from other related standards and form factors, specifically **M.2** and **mSATA**. ### Associated Imagery Images associated with the PCI Express Mini Card include examples of its application: * An Intel Wi-Fi card PRO Wireless WM3945ABG. * An Intel Centrino Advanced-N 6205, which is described as a wireless network adapter in a half-length mPCIe card.