What this part is and where it fits
The Texas Instruments LM3S308-EQN25-C2T is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris® family, clocked at 25 MHz with 16 KB of Flash program memory and 4 KB of RAM. It integrates a 10-bit ADC with eight channels, along with serial interfaces including I²C, SPI, UART, SSI, and Microwire. The 48-LQFP package provides 28 general-purpose I/O lines. Rated for -40°C to 105°C, it suits industrial environments such as motor drives, outdoor telecom gear, and factory automation controllers.
25 MHz core — what it means for the control loop
At 25 MHz, the Cortex-M3 core delivers deterministic throughput. That is sufficient for sensor polling, PID loops, and protocol framing at moderate baud rates.
Industrial temperature grade and peripheral set
The -40°C to 105°C range qualifies the MCU for under-hood automotive, outdoor base stations, and factory-floor modules without active cooling. The built-in brown-out detect, POR, PWM, and watchdog timer reduce external supervisor IC count. The 8-channel 10-bit ADC samples at rates adequate for temperature, pressure, or current-sense inputs in a control loop.
Obsolete — sourcing reality
Texas Instruments has marked the LM3S308-EQN25-C2T as obsolete. No further factory orders are accepted. This part is available through independent distribution on a sourced-to-order basis against an RFQ. Availability and current pricing are confirmed at quote time. No official TI successor is listed for this exact order code; for a pin-compatible alternative within the Stellaris family, check the LM3S3xxx series variants with matching 48-LQFP footprint and supply range.