This part is officially marked obsolete by the manufacturer. That means no further production runs, no last-time-buy windows, and no factory support for new designs. If you have an existing board that uses this MCU, you are looking at the surplus and broker channel for replenishment. The 50 MHz Cortex-M3 core and the specific peripheral mix (CANbus, three 10-bit ADCs) made it a fit for a generation of industrial controllers, but anyone specifying it fresh should plan for a migration path.
Pin-compatible alternatives in the Stellaris family
Within the same Stellaris ARM Cortex-M3S 2000 series, the LM3S2536 is a direct density upgrade — same 100-LQFP footprint, same peripheral set, but with more Flash and RAM. The difference comes down to memory headroom for firmware growth. If your code fits in 96 KB and you are locked into the BOM, the LM3S2533 is the part; if you need space for additional features or a communications stack, the LM3S2536 is the natural drop-in without a board respin.
We source it through our independent supply network — verified surplus, new-old-stock, and qualified broker inventory. If you need a production-run quantity or a one-off for a repair, send the RFQ; we will check the network and come back with a firm position.