For existing production, last-time-buy windows have closed; availability is limited to surplus and independent-distribution stock. Sourcing is possible through the broker channel, but quantities are finite and pricing reflects scarcity. If you are qualifying a replacement, the Stellaris family includes pin-compatible options with similar peripheral sets — verify the exact memory and supply voltage match for your board.
2.5 V supply — plan the power rail
If your board already runs 3.3 V, you will need a dedicated LDO or a buck converter to drop to 2.5 V. No exposed thermal pad — dissipation goes through the leads, so keep the ambient airflow reasonable above 85°C.