Hi Ian,
The FXAS21000CQ is no longer manufactured and has been replaced by FXAS21002CQR1. However, the estimated lead time of the FXAS21002CQR1 is 24 weeks, the device is still in qualification process.
Our AN4917 describes the hardware and software differences between these parts and provides information on transitioning from FXAS21000CQ to FXAS21002CQR1.
If you need any additional information, please let me know.
Regards,
Tomas
PS: If my answer helps to solve your question, please mark it as "Correct" or “Helpful”. Thank you.