Drive:
Newer revisions of the Kingston A400 might come with Micron FortisFlash B16A / B17A
This drive was also a victim of many component swapping, since the flash has changed many times over time, and also it's controller, that in some revisions came with Silicon Motion SM2258XT or even 59XT.
They also make use of Static pSLC Caching in order to improve performance and reliability
Controller:
In order to improve performance, Phison implemented a way that the controller utilizes it's internal 32 MiB of SRAM as some kind of "Pit-stop" that is allocated for incoming Write request in order to improve performance since it's a very quick to access and fast RAM. This implementation was called Smart Cache Flush.
This SmartCacheFlush technology allows incoming data to only have a “pit stop” in the cache and then move to the NAND flash at once. If the flash is jammed due to particular file sizes (such as random 4KB data), the cache will be treated as an “organizer”, consolidating incoming data into groups before written into the flash to improve write amplification.