Obsolete — sourcing path for existing BOM lines
The LM3S1620-IQC25-A2 is listed as Obsolete by Texas Instruments. For builds already qualified to this Stellaris ARM Cortex-M3 MCU, the only supply route is through independent surplus or broker channels — no last-time-buy window remains open. Any replacement will require a board-level respin and firmware migration to a current-generation Cortex-M3 or M4 device.
Core architecture and on-chip memory
Built around the ARM Cortex-M3 core running at 25 MHz, this 32-bit single-core MCU delivers deterministic interrupt handling and a single-cycle multiply for control-loop tasks. The 128 KB on-chip flash (128K x 8) and 32K x 8 SRAM provide enough code and data space for a moderate-sized application — a CANopen stack, sensor fusion, or a basic HMI — without external memory.
On-chip peripherals include brown-out detect, POR, PWM, and a watchdog timer — enough to build a standalone controller without external supervisor ICs. Serial interfaces cover I²C, IrDA, Microwire, QEI, SPI, SSI, and UART/USART, so the part can talk to encoders, sensors, displays, and legacy fieldbuses from a single 52-I/O package.
Housed in a 100-LQFP (14x14 mm body), the 0.5 mm pitch demands a 4-layer PCB for clean fan-out of the peripheral signals and power rails.