Adata Pushes microSD P/E Cycle Count to 100 000

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Flash Memory Cells with Charge Trap MOSFETs

3D NAND flash memory cells use a charge trap MOSFET. This layer stores electrons that pass through an insulator (tunnel oxide layer) via quantum tunneling, as described by the Fowler-Nordheim theory. The more electrons stored in this layer, the more the threshold voltage for opening the MOSFET shifts toward positive values.

Since it’s not always possible to store the same number of electrons in the charge trap, the threshold voltage will vary, with the variation statistically defined by the probability density.

The actual BiCS5 flash memory chip contains 112 layers and can have up to 40,000 ‘U-strings’ in the x-direction and 25,000 ‘U-strings’ in the y-direction.

Understanding A+ SLC

A flash memory cell can either be erased (with no electrons in the charge trap) or programmed (with some electrons in the charge trap). The A+ SLC algorithm stores a ‘lower number of electrons than the maximum possible‘ in the charge trap. This allows for the use of a shorter programming/erase pulse, which reduces damage to memory cells during writing/erasing.

Features and Specifications of ADATA A⁺ SLC microSD Memory Cards:

• Compliant with SD 6.1 specifications
• 100K P/E Cycles
• Ambient working temperatures range: -40 °C to 85 °C
• Meets V30 (Video Speed Class) standard
• Meets A2 (Application Performance Class) standard, random read IOPS (4K) > 4 000, random write IOPS (4K) > 2 000
• Global wear leveling, garbage collection, bad block management, low-density parity-check code (LDPC) ECC and SMART

Sequential read: 94 MB/s, sequential write: 81 MB/s (tested by Crystal Disk Mark 5.1.2.)

Endurance under load according to JESD219, client workload

• 16GB: 920 TB
• 32GB: 1840 TB
• 64GB: 3680 TB

Now let’s take a closer look at the endurance results and how they reflect the performance of the A+ SLC firmware.

For microSD memory cards, the resulting value of 1,74 TB written is truly impressive.

MicroSD supports SMART and you can read SMART attributes by using the CMD56 command. MicroSDs are covered by a 3-year warranty.

Selected ADATA IUD33K microSD memory cards are now part of our stock and are readily available for your projects. Other models are also available on request under favourable conditions.