ARM Cortex-M3 with Ethernet — what this MCU brings
The LM3S6610-EQC25-A2 is a 32-bit ARM Cortex-M3 MCU from the Stellaris family. It runs at 25 MHz with 128 KB of Flash and 32 KB of RAM.
25 MHz — enough for real-time control loops
The 25 MHz core drives the PWM and Ethernet interrupt service routine. The 46 GPIOs and internal oscillator simplify board layout.
Obsolete — sourcing through independent channels
The LM3S6610-EQC25-A2 is officially marked obsolete by Texas Instruments. No last-time-buy window remains; the only supply channel is the independent surplus and broker market.
The -40 to 105 °C operating temperature range qualifies this MCU for industrial environments — motor drives in unventilated cabinets, outdoor telecom enclosures, and engine-bay-adjacent controllers. The 100-LQFP package (14x14 mm) is a standard footprint for mid-density MCUs; rework and inspection are straightforward with a hot-air station and a microscope.