Texas Instruments has marked the LM3S5G31-IQC80-A1 as Obsolete. No official successor is recorded, so the only path to fill a BOM line is through independent distribution — surplus, new-old-stock, or broker channels. Availability is lot-specific and confirmed at quote time.
80MHz Cortex-M3 with 384KB Flash
The LM3S5G31-IQC80-A1 is a 32-bit single-core ARM Cortex-M3 MCU running at 80 MHz. It belongs to the Stellaris ARM Cortex-M3S 5000 series. On-chip memory includes 384 KB of Flash and 64 KB of SRAM — enough for a moderate control stack with room for a real-time OS and application buffers. The peripheral set covers brown-out detect, POR, DMA, I²S, PWM, and a watchdog timer. Connectivity spans CAN, EBI/EMI, I²C, IrDA, LIN, Microwire, QEI, SPI, SSI, and UART/USART — this part was designed to bridge multiple fieldbuses in a single control node.
Industrial temperature grade and 100-LQFP
The 100-LQFP package (14x14 mm) is a standard fine-pitch surface-mount footprint — reworkable with a hot-air station, but the 0.5 mm pitch demands careful solder-paste stencil design to avoid bridging.