Lexar this past week introduced its new family of A2-class microSD cards, the Lexar High-Performance 633x A2. Supporting the highest Application Performance class, the new microSD card is designed in particular for smartphones that need additional storage space for applications. Overall the Lexar High-Performance 633x family of microSD cards is fairly diverse; the cards range in capacity from 16 GB to 512 GB in capacity, and not all of the cards meet an App Performance class standard. Indeed, only the new 512 GB card meets the A2 class standard, while the medium-sized cards are A1 class.
Under the hood, all the cards use the UHS-I bus and are rated for 95 MB/s – 100 MB/s reads as well as 45 MB/s – 70 MB/s writes. Most of the cards in the lineup support the Video Speed Class 30 spec, therefore offering at least 30 MB/s sequential write speeds. As for operating temperature range, it is pretty standard: from 0° to 70° C (32°F to 158°F), which is good enough for everyone except those using specialized devices to work in extreme conditions.
The key feature of the Lexar High-Performance 633x range is of course support for A1 and A2 App Performance specifications, for use with Android phones that need more space for applications. While A1 cards are pretty common these days, A2 cards are still rare partly because they require a more sophisticated (and expensive) controller and partly because not all of their features can be experienced on commonly available hosts.
As we've mentioned before, A2-badged microSD cards mandate a random performance of at least 4000 read IOPS and 2000 write IOPS (vs. 1500/500 read/write IOPS mandated by the A1). Meanwhile, A2-compliant controllers have to support such functions as command queuing (with a minimum depth queue of 2 and a maximum depth queue of 32) to optimize random read performance, caching to hit write performance targets, as well as self-maintenance capabilities. Though to get the most out of an A2 card, the host also needs to support command queuing to guarantee the device's read performance.
| Lexar High-Performance 633x microSD Cards | ||||||||
| 512 GB | 256 GB | 128 GB | 64 GB | 32 GB | 16 GB | |||
| Sequential Read Speed | 100 MB/s | 95 MB/s | ||||||
| Sequential Write Speed | 70 MB/s | 45 MB/s | ? | |||||
| Minimum Sequential Write Speed | 30 MB/s | 10 MB/s | ||||||
| Minimal Random Read Speed | 4000 IOPS | 1500 IOPS | ? | |||||
| Minimal Random Write Speed | 2000 IOPS | 500 IOPS | ? | |||||
| Operating Temperatures | 0° to 70° C (32°F to 158°F) | |||||||
| Interface | UHS-I | |||||||
| Availability | Q4 2018 | |||||||
| SDA Labels | A2, V30, U3 | A1, V30, U3 | A1, V10, U1 | U1 | ||||
| Part Numbers | LSDMI512BBNL633A LSDMI256BBNL633A LSDMI128BBNL633A LSDMI64BBNL633A LSDMI32BBNL633A LSDMI16BBNL633A |
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Lexar’s High-Performance 633x family of microSD are already available from retailers like Amazon. The models featuring capacities up to 256 GB are priced up to $179.99. The top-of-the-range 512 GB A2-compliant model is expected to hit the market shortly at a price of $299.99.
Related Reading:
- SanDisk Extreme microSD Cards with A2 App Performance Spec Unveiled: 4K/2K IOPS
- Western Digital Launches SanDisk Ultra microSD Card with 400 GB Capacity
- ADATA Demos A2-class microSD Card with 4K/2K IOPS Minimum, Mulls Late 2017 Launch
- SD Association Announces UHS-III (up to 624 MB/s), A2 Class, LV Signaling
- Western Digital Begins to Sample QLC BiCS4: 1.33 Tbit 96-Layer 3D NAND
- Western Digital Demos SD Card with PCIe x1 Interface, 880 MB/s Read Speed
Source: Lexar
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