Hi @vivek-pandharinath_mali
According to the NXP's Product Longevity program, the S32K14x devices are available for 15 years. Extended periods are available under special circumstances.
Also referring to availability of the FS32K146HAT0MLQT please contact your nearest NXP distributor: Distributor Network
I hope this will help you.
B.R.
VaneB