The LM3S5P31-IBZ80-C1 is a 32-bit ARM Cortex-M3 MCU from the Stellaris 5000 series, clocked at 80 MHz with 64 KB of Flash and 24 KB of RAM. It includes USB OTG, CAN, dual UART, and 67 I/O in a 108-LFBGA, operating from -40°C to 85°C.
Obsolete — sourcing through independent channels
This part is marked obsolete by Texas Instruments. No last-time-buy window remains open; the only supply path is the surplus and broker market. We source and quote it to order against an RFQ — availability and current pricing confirmed at quote time. No official replacement part number has been published by TI for this exact order code.
80 MHz Cortex-M3 — what it means for the BOM
The 80 MHz core speed on a Cortex-M3 puts this MCU in the mid-range tier for control-loop and protocol-stack tasks — fast enough to run a Modbus TCP stack alongside a PID loop, but not a candidate for high-rate sensor fusion or video processing. The 64 KB Flash limits firmware to a single application image; field-upgrade strategies need an external serial Flash for OTA staging.
Package and integration note
The 108-LFBGA (10x10 mm) is a fine-pitch BGA — requires controlled reflow profile and X-ray inspection post-solder. The 1.08 V to 1.32 V core supply needs a dedicated regulator.