Texas Instruments Stellaris® ARM® Cortex®-M3S 300 series MCU, LM3S301-EQN20-C2, 32-Bit Single-Core, 20MHz, 16KB Flash, 2K x 8 RAM, 48-LQFP, -40°C~105°C.
| Parameter | Value |
|---|---|
| Series | Stellaris® ARM® Cortex®-M3S 300 |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 3V ~ 3.6V |
| Operating temperature | -40°C~105°C(TA) |
| Speed | 20MHz |
| Package | Tray |
| RAM size | 2K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | Microwire, SPI, SSI, UART/USART |
| Number of i (O) | 33 |
| Core processor | ARM® Cortex®-M3 |
| Case | 48-LQFP |
| Data converters | A/D 3x10b |
| Program memory size | 16KB (16K x 8) |
The LM3S301 carries a Not Recommended for New Design (NRND) status. TI has stopped actively promoting the part.
At 20 MHz the Cortex-M3 delivers roughly 20 DMIPS — enough for a PID loop with a few kHz update rate, Modbus RTU framing, or basic sensor fusion.
Yes, the LM3S301-EQN20-C2 is classified as NRND (Not Recommended for New Design). This means TI no longer recommends it for new projects, and an end-of-life notice is expected. For existing designs, secure a last-time-buy quantity to cover remaining production needs.
No official direct replacement order code is listed from TI for this exact Stellaris density and package. Migration to a current-generation Cortex-M4 or M0+ part (such as the TM4C series) will require a firmware port and potentially a board layout change. The 48-LQFP footprint may be reused across some Stellaris siblings, but pin compatibility is not guaranteed without checking the respective datasheets.
The supply voltage range is 3.0 to 3.6 V. A 3.3 V regulated rail with ±2% tolerance keeps the MCU within spec across temperature.
Key specs include a 32-bit ARM Cortex-M3 core at 20 MHz, 16 KB Flash, 2K x 8 SRAM, 33 GPIOs, 3-channel 10-bit ADC, serial interfaces (Microwire, SPI, SSI, UART/USART), internal oscillator, and an industrial temperature range of -40 to 105 °C in a 48-LQFP package.