What this Stellaris Cortex-M3 MCU is and where it fits
The Texas Instruments LM3S2939-EQC50-A2 is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris® series, built for real-time control in industrial and automotive-adjacent applications. It runs at 50 MHz from a 2.25 V to 2.75 V supply, with 256 KB of Flash program memory and 64 KB of RAM — enough for moderate-complexity firmware stacks like motor control loops, CAN-based sensor fusion, or multi-protocol gateway logic. The 100-pin LQFP package exposes 57 general-purpose I/O and a full set of serial interfaces: CAN, I²C, SPI, SSI, UART, and IrDA, plus a quadrature encoder interface for position feedback.
Obsolete — sourcing reality
Texas Instruments has marked the LM3S2939-EQC50-A2 as Obsolete. No official successor part number is published for this specific variant. For new designs, look at the TM4C12x family or other active Cortex-M4 parts in the same 100-LQFP footprint — but pin compatibility is not guaranteed. For existing BOM lines already qualified, this part is available through independent distribution on a quoted-to-order basis. Availability and current pricing are confirmed at RFQ time.