Core specs and what they mean for a BOM line
The LM3S1816-IQR50-C0T is a Stellaris ARM Cortex-M3S 1000 series microcontroller from Texas Instruments, built around a 32-bit Cortex-M3 core clocked at 50 MHz. The 256 KB on-chip flash and 32 KB SRAM provide enough headroom for a moderate control application — think motor drive firmware with a communication stack, not a full GUI. The 33 GPIOs and the peripheral mix — I²C, SPI, SSI, UART/USART, plus IrDA and Microwire — cover most sensor and actuator interfaces on a factory-floor control board. The 8-channel 10-bit ADC samples analog feedback without an external converter. That means it can sit inside a panel near a motor drive without derating.
Housed in a 64-LQFP with a 10x10 mm body, the 0.5 mm pitch demands a controlled-impedance PCB stack-up for the high-speed serial interfaces. The supplier device package is 64-LQFP (10x10), so the footprint is standard across the Stellaris 1000 series — a board designed for one 64-pin LQFP variant can accept others in the family with a firmware change.
Lifecycle reality — obsolete, not end-of-life inventory
Texas Instruments lists the LM3S1816-IQR50-C0T as obsolete. That means the manufacturer has stopped production and there is no last-time-buy window open. If your BOM line calls for this exact order code, the supply is surplus and broker-managed; a pin-compatible drop-in from the same Stellaris family may be a more sustainable path for new builds.