Multimedia Cards (MMC)

February 2017

MMC - Multimedia Cards


Multimedia card memory (abbreviated as MMC) is a type of memory card created jointly by SanDisk and Siemens in November 1997.

Its architecture is based on a combination of read-only memory (ROM) for read-only applications and flash memory for read/write purposes.

Multimedia cards are very small (24.0 mm x 32.0 mm x 1.4 mm), which is equivalent to the size of a postage stamp, and weigh only 2.2 grams.

MMC Card - Multimedia Card



There are two types of MMC cards that have different voltages:

  • MMC 3.3V, with a notch on the upper left-hand corner
  • MMC 5V, with a notch on the upper right-hand corner



Data can be accessed by way of an edge connector with 7 pins, for a throughput of up to 2 Mb/s (perhaps even 2.5 Mb/s).

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