page_title: MultiMediaCard
section_title: eMMC
hierarchical_section_title: MultiMediaCard / Variants / eMMC
caption_attribution_description: English: Samsung Galaxy Tab 2 10.1 - Samsung KLMAG2GE4A-A002 - eMMC. Package: FBGA
context_page_description: MultiMediaCard, officially abbreviated as MMC, is a memory card standard used for solid-state storage. Unveiled in 1997 by SanDisk and Siemens AG, MMC is based on a surface-contact low pin-count serial interface using a single memory stack substrate assembly, and is therefore much smaller than earlier systems based on high pin-count parallel interfaces using traditional surface-mount assembly such as CompactFlash. Both products were initially introduced using SanDisk NOR-based flash technology. MMC is about the size of a postage stamp: 24 mm × 32 mm × 1.4 mm. MMC originally used a 1-bit serial interface, but newer versions of the specification allow transfers of 4 or 8 bits at a time. MMC can be used in many devices that can use Secure Digital cards.
  Typically, an MMC operates as a storage medium for a portable device, in a form that can easily be removed for access by a PC. For example, a digital camera would use an MMC for storing image files. Via an MMC reader, a user could transfer pictures taken with the digital camera to his or her computer. Modern computers, both laptops and desktops, often have SD slots, which can additionally read MMCs if the operating system drivers can.
context_section_description: The eMMC (embedded MMC) architecture puts the MMC components (flash memory plus controller) into a small ball grid array (BGA) IC package for use in circuit boards as an embedded non-volatile memory system. eMMC exists in 100, 153, 169 ball packages and is based on an 8-bit parallel interface.  This is noticeably different from other versions of MMC as this is not a user-removable card, but rather a permanent attachment to the circuit board. In the event of an issue stemming from either the memory or its controller, the PCB (printed circuit board) would need to be replaced or repaired. 
  Almost all mobile phones and tablets used this form of flash for main storage up to 2016, when UFS started to take control of the market. The latest version of the eMMC standard (JESD84-B51) by JEDEC is version 5.1A released January 2019, with speeds rivaling discrete SATA-based SSDs (400 MB/s).
  eMMC does not support the SPI-bus protocol. eMMC uses NAND flash.
caption: eMMC KLMAG2GE4A-A002 inside the Samsung Galaxy Tab 2 10.1.
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