The LM3S1911-IBZ50-A2 is a Texas Instruments Stellaris ARM Cortex-M3 MCU — 32-bit single-core at 50 MHz, with 256 KB Flash and 64 KB SRAM. It carries 60 GPIOs and a peripheral set covering I²C, SPI, SSI, UART/USART, IrDA, and Microwire, plus a PWM unit and watchdog timer. The part is rated for industrial temperature range (-40 to 85 °C) and comes in a 108-ball BGA (10x10 mm). This was a mid-range Stellaris part for control and connectivity applications in factory automation, building control, and sensor hubs.
NRND — plan the BOM transition
Texas Instruments has marked the LM3S1911-IBZ50-A2 as NRND (Not Recommended for New Designs). This means the part is still available for existing production but is on a path toward end-of-life. There is no official L* successor listed in the evidence. For new designs, look at the current TI Cortex-M4 or M33 portfolio; for existing BOMs, secure last-time-buy quantities or plan a pin-compatible migration. We source this part through independent distribution and quote it to order against an RFQ — availability and current pricing are confirmed at quote time.