What is the latest RF HEMT for prototype LNA?

I tried to design an LNA before using ATF55143, but I see they became obsolete. What can I use now for a 2-3 GHz low noise HEMT?

Nowadays, it's really hard to find discrete HEMT or its variants transistors.Almost all IV-V Compound Semiconductor Companies are going with with Dedicated Integrated Products and discrete components are rarely found at some few manufacturers.
If I were you I'd consider SiGe from Infineon..

Maybe this is for you:
https://www.minicircuits.com/pdfs/SAV-541+.pdf

For this relative low frequency range you can use available SiGe transistors, which may have even lower noise figure than HEMT transistors at those frequencies.

https://www.nxp.com/parametricSearch...854_c864_c1545