Catalyst 3750G- Series —
Covered past the OEM cutoff by an independent maintainer.
Modules and units still circulate on the secondary market.
Carrying production traffic? Set the replacement window now, not mid-outage.
Low-criticality role — document the risk, harden backups, retire on your terms.
No. Cisco's last date of support for 3750G-24TS-S1U was Mar 2014 (per the Cisco EOL bulletin) — it is past end of service life.
3750G-24TS-S1U reached end of sale Mar 2009, per the Cisco EOL bulletin.
Mar 2014 — per the Cisco EOL bulletin.
After the last date of support, 3750G-24TS-S1U units can often be kept in production through third-party maintenance providers. Cisco no longer issues software fixes, support, or hardware replacement for it.