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Texas Instruments LM3S301-IQN20-C2T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S301-IQN20-C2T Stellaris ARM Cortex-M3 MCU, 20 MHz, 16 KB Flash

MPNLM3S301-IQN20-C2T
NRND

Texas Instruments Stellaris® ARM® Cortex®-M3S 300 series MCU, LM3S301-IQN20-C2T, 32-bit single-core ARM Cortex-M3 at 20 MHz, 16 KB Flash, 2 KB RAM, 33 I/O, 3x10b ADC, -40°C to 85°C, 48-LQFP (7x7 mm).

$4.3524Ref. price · indicative, final on quote
Texas Instruments LM3S301-IQN20-C2T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S301-IQN20-C2T specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 300
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))3V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed20MHz
PackageTape & Reel (TR)
RAM size2K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
ConnectivityMicrowire, SPI, SSI, UART/USART
Number of i (O)33
Core processorARM® Cortex®-M3
Case48-LQFP
Data convertersA/D 3x10b
Program memory size16KB (16K x 8)

Product details

At 20 MHz the Cortex-M3 executes most single-cycle instructions.

16 KB of Flash holds a modest firmware image. 2 KB of RAM is the real constraint.

Industrial temperature and peripherals

The brown-out detect and POR ensure clean startup in noisy environments. The PWM and watchdog timer cover the basic control and supervision tasks without external supervisor ICs. Connectivity options — Microwire, SPI, SSI, UART/USART — cover the common serial buses for industrial sensors and HMI panels.

TI has not issued a formal last-time-buy notice for this exact variant, but the NRND flag means the part is in the phase-out pipeline. New designs should target a pin-compatible Stellaris or Tiva-C replacement.

Frequently asked questions

What is the closest pin-compatible alternative to LM3S301-IQN20-C2T?

No official pin-compatible successor is listed in the lifecycle record. The Stellaris LM3S3xx family shares the same 48-LQFP footprint across density options, so a higher-density sibling (e.g. LM3S308 with 64 KB Flash) may drop in if the firmware fits. Verify the peripheral set and supply voltage before substituting.

What is LM3S301-IQN20-C2T's listed speed?

The core runs at 20 MHz. At this clock rate the Cortex-M3 executes most instructions in a single cycle, giving roughly 20 MIPS throughput for straight-line code.