Can you tell me if the following part numbers are obsolete?

[Opex]

M27C512-12F1

LF351N

Thank you

[Tesla DeLorean]

The EPROM is very OLD, Mouser says it is obsolete, and I'd imagine the fab has been shuttered, sold or updated long ago. Last datasheet was from 12+ years ago

You might be able to find parts, or equivalents in the secondary market.

You could perhaps use faster parts, or OTP variants without the quartz window. Understand the actual requirements of the circuit you're using them in.

[Tesla DeLorean]

M27C512-12F1 plenty on eBay

[Opex]

Great, thank you very much for your help, I appreciate it!