SD/MMC Socket for Secure Digital Disk or Multi Media Cards

Replacement:PRT-11362. This connector is End-of-Life and is being replaced with a new connector with a different pin configuration. This page is for reference only.

Do you need *a lot *of space? EEPROMs not quite enough? How's 1GB sound? This is a socket used to interface to SD (Secure Data Disk) and MMC (Multi Media Card). We used it to test out our 'PIC to FAT16 on SD' routines. The SD/MMC cards use a very simple SPI serial bus as well as a 4-bit proprietary bus.

A breakout board is available below.



Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Poven / about 15 years ago / 2

    This is a push-push type slot, the same as the one that comes mounted on the breakout board. I soldered this onto a copper clad perfboard and it is working great for a lot less than the version that comes with the custom breakout board.

  • PCPete / about 13 years ago / 1

    Whoever designed this component drawing (Kenvin) should be shot. Multiple times. The same goes for the designer of this troublesome little bit of tin!
    What an horrific footprint! 4 different pin spacings (WTF?) and 6 different pad sizes. That's just sloppy engineering, period.
    And Kenvin doesn't know very much at all about drafting dimensions. He's not only missed critical dimensions, he's also taken the least reliable point in the device as the origin - and then worked backwards from there! So not only are the dimensions backward-relative to the least precise point on the device, he's simply subtracted and daisy-chained the dimensions. That's why there are up to 4 decimal places in some measurements!
    In fact, he's also given two completely different dimensions for the centre line. with 2 different references.
    Still, it's done now, and if anyone wants a Protel footprint, let me know. I'd hate to think anyone else needed to go to such trouble! It's probably cost me more to re-draught than buying a breakout board.
    Kudos to the Sparkfun designers, they must have to put up with this a lot.

    • EliTheIceMan / about 13 years ago / 1

      At first I thought this comment was a bit harsh but after printing out the layout and putting my socket on it I can say that the back pins all work fine but the sides are way off. You will need to modify the layout to firmly secure the socket or use the card sensing/write protecting switch pins. Please fix this SparkFun. I buy your products because you provide a layout.

    • And this is why we charge money for breakouts :-)

  • Nogginboink / about 14 years ago / 1

    Hey guys, the Eagle library appears to have an issue with this part. Lines "WP" and "CD" are shown in different places inside and outside the box in the symbol.

  • javirosa / about 14 years ago / 1

    What purpose does the SW pin serve on the connector? It appears in the eagle schematic and is unlabelled in the data sheet.

  • pomprrocker / about 14 years ago / 1

    I need a short body smd sd card socket!! I can only find them on manufacturers websites in China!

  • The "SD Card Specification" link is broken, but a real nice SD card and protocol spec can be found at It might not be a completely legit copy, so download it while you can.
    The "Another nice breakdown of the SD SPI protocol" link is also broken; it brings up a generic page at the Sharp site.

  • ARMinator / about 14 years ago / 1

    Hum how confusing.
    So now, which datasheet is supposed to go with the part? The one provided by Levi or the one provided by SF?
    How about the SF library, is it now updated with whatever part is sold by SF?

    • N8B / about 14 years ago / 1

      Levi is correct, the incorrect spec sheet was posted. The correct one is now posted.

  • Member #12417 / about 15 years ago / 1

    The datasheet given on this page is for the similar, but different, socket by the same manufacturer. You will notice that the socket in the picture only has three shielding connections, while the one in the datasheet has four. Since the part in the SFE Eagle Library is based off of this datasheet, it also has the wrong footprint; however, the two parts are similar enough that it still works.
    The correct datasheet can be found on the manufacturer's website:

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