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Texas Instruments LM3S101-IRN20-C2 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S101-IRN20-C2 Stellaris ARM Cortex-M3 MCU, 20MHz

MPNLM3S101-IRN20-C2
End of Life

Texas Instruments Stellaris® ARM® Cortex®-M3S 100 LM3S101-IRN20-C2, 32-Bit Single-Core MCU, 20MHz, 8KB FLASH, 2K x 8 RAM, 18 I/O, 28-SOIC, -40°C~85°C.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM3S101-IRN20-C2 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 100
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))3V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed20MHz
PackageTube
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)18
Core processorARM® Cortex®-M3
Case28-SOIC (0.295\", 7.50mm Width)
Program memory size8KB (8K x 8)

Product details

20 MHz Cortex-M3 with 8 KB Flash — what the memory budget means

The 18 general-purpose I/O lines, along with built-in peripherals like PWM, watchdog timer, and brown-out detect, let it handle simple motor control, sensor interface, or human-machine interface tasks without external glue logic.

Supply range is 3.0 V to 3.6 V, compatible with standard 3.3 V logic and linear regulators.

The serial interface set includes SPI, SSI, Microwire, and a UART/USART — enough for SPI flash, serial ADCs, or RS-485 transceivers.

For BOM planning, there is no last-time-buy risk to budget around.

Frequently asked questions

What is the replacement or equivalent for LM3S101-IRN20-C2?

The Stellaris family includes higher-density siblings (more Flash/RAM) in the same 28-SOIC footprint, but those require firmware migration. For a drop-in alternate, verify pin compatibility against the specific package variant.