Active lifecycle — no LTB clock ticking
The EP4CE115F29C9LN carries an Active product status. Intel has no published end-of-life notice for this density/speed/package combination.
The 0°C to 85°C (TJ) operating range covers most controlled-environment gear — factory controllers, network switches, lab instruments. It does not extend to -40°C cold-start or 100°C+ under-hood conditions. If your system sees those extremes, you'd need the industrial-grade Cyclone IV E variant (I suffix) or a Cyclone 10 LP part like the 10CL120ZF780I8G, which is rated -40°C to 100°C (TJ) and offers a similar logic density in the same 780-FBGA package.