NRND — last-time-buy window, no official successor
Texas Instruments lists the LM3S3634-IQR50-A0 as NRND (Not Recommended for New Designs). The part is still available for existing production runs, but TI has not published a last-time-buy cutoff date in the current lifecycle record. No pin-compatible or functional successor is listed on the manufacturer's cross-reference — any BOM migration will require a board spin and firmware port.
50 MHz Cortex-M3 — 128 KB flash, 32 KB RAM, USB, industrial temp
The ARM Cortex-M3 core runs at 50 MHz — enough for a control loop with a moderate protocol stack (USB + UART + SPI) without external memory. The 128 KB flash and 32 KB RAM leave room for a real-time OS kernel and application buffers in a sensor hub or motor drive interface. Connectivity includes USB (device/host/OTG), I2C, SPI, SSI, UART/USART, and IrDA — the peripheral set covers industrial fieldbus bridging and human-machine interface communication. Eight 10-bit ADC channels handle analog feedback from current shunts or thermistors. Operating temperature spans -40 to 85°C, so the part fits factory-floor enclosures and outdoor equipment without active cooling.
64-LQFP 10x10 mm — board integration and GPIO
Surface-mount assembly standard — no special bake requirements for the tray packaging unless the MSL (Moisture Sensitivity Level) label on the reel indicates a floor life shorter than the assembly floor time. Verify the date code on the tray before reflow.