The LM3S308-IQN25: Sourcing now runs through independent distribution and surplus inventory, which is the channel this listing serves. It was designed for cost-sensitive control applications where the Cortex-M3 architecture gave a step up in code density and interrupt latency over 8- or 16-bit parts of the era.
The 25 MHz ARM Cortex-M3 core delivers enough throughput for UART/SPI/I²C protocol handling, PWM generation, and 10-bit ADC sampling across eight channels. The 4K x 8 SRAM is tight — enough for a modest RTOS tick and a few buffers, but not for frame buffers or large data logs. The 16 KB Flash limits firmware to compact control loops; anything needing a TCP/IP stack or USB stack will overflow.
Sourcing a discontinued MCU — what to expect
Because the LM3S308-IQN25 is obsolete, availability is limited to what exists in surplus and broker inventories. This listing sources the part through independent distribution channels — each order is quoted against confirmed inventory at the time of the RFQ. There is no factory lead time to reference; the supply is what the market holds. For a production BOM that cannot requalify a new MCU, the procurement strategy is to secure a lifetime buy quantity from available surplus lots.