Obsolete — what that means for your BOM line
This part is officially obsolete (EOL). No further factory orders are possible, and the last-time-buy window has closed. If you have an active BOM line that calls out LM3S5C36-IQR80-A1T, the only sourcing path is the independent surplus and broker channel — which is exactly what we cover. We can source this device to order against an RFQ; availability and current pricing are confirmed at quote time. Do not assume you can still buy it through standard distribution — you cannot.
80 MHz Cortex-M3 — what it means for your control loop
80 MHz on a single-cycle Cortex-M3 delivers roughly 80 DMIPS. That is enough for a field-oriented motor control loop with CANopen stack and headroom for a Modbus RTU slave.
512 KB Flash / 64 KB RAM — sizing the firmware
512 KB of Flash holds a full application with a real-time OS, a CANopen or USB stack, and a bootloader for field updates. The 64 KB SRAM is tight for large data buffers.
Industrial temperature and package
The -40 to 85°C rating suits factory-floor, outdoor telecom, and engine-bay-adjacent enclosures. The 64-LQFP (10x10 mm) is a common footprint.