The microSD Card is a type of Removable NAND-type small flash memory
card format which was introduced in 2003.
microSD measures 11mm x 15mm and is 1mm thick.
Two pinout tables are provided for microSD below; one table provides the pin out for SD Mode, and one table shows the SPI mode.
MicroSD Connector Manufacturers are listed below.
MicroSD is short hand for Micro-Secure Digital [Transflash]. Although Transflash was the original name for microSD, the name was changed to microSD once the standard was adpoted. Some manufacturers still use the term microSD/Transflash to describe a product.
Also refer to the SD
Card, or the miniSD
Card pages.
There are 3 speed grades: Class 2, 2MB/s, Class 4, 4MB/s and class 6 cards, 6MB/s.
Mini and micro SD Card - EMI filtering and 25 kV ESD protection: EMIF06-mSD01F2, STMicroelectronics
Pin # | Pin name | Signal Function |
1 | DAT2 | Data Bit 2 |
2 | CD/DAT3 | Card Detect / Data Bit 3 |
3 | CMD | Command Line |
4 | Vdd | Supply Voltage 2.7v / 3.6v |
5 | CLK | Clock |
6 | Vss | Ground |
7 | DAT0 | Data Bit 0 |
8 | DAT1 | Data Bit 1 |
Comparison of Removable Memory Card sizes
Pin Number | Pin name | Signal Function |
1 | NC | No Connect |
2 | /CS | Chip Select |
3 | DI | Master Out/Slave In (MOSI) |
4 | Vdd | Supply Voltage 2.7v / 3.6v |
5 | CLK | Clock |
6 | Vss | Ground |
7 | DO | Master In/Slave Out (MISO) |
8 | RSV | Reserved |
The SPI mode is optional in the microSD format.
The graphic to the right shows: The MicroSD form factors |
Comparison of SD Memory Card sizes Including the SD Card, miniSD Card, and microSD Card styles. |
This is a listing of OEM microSD connector manufacturers. In most cases the connector is a surface mount [SM] device, that mounts to the Printed Wiring Board [PWB] via SMT.
MicroSD or Trans Flash are both the same type of PHY interface.
Fujitsu
{microSD/TransFlash connector, Surface Mount}
molex
{microSD Memory Card Connector, Normal Mount SMT}
Tyco Electronics
{MicroSD Surface mount connector with in-line leads}
Wieson Technologies Co., Ltd.
{MicroSD Connectors}
Yamaichi Electronics
{microSD Card Reader - Hinge Type/Top Mount, Reversed Type,
microSD Card Adapter (microSD-to-miniSD)}
The microSD standard has evolved from and has taken the place of the previous TransFlash term.
However some companies still use the term TransFlash to describe this interface.
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