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Texas Instruments LM3S101-EQN20-C2T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S101-EQN20-C2T Stellaris ARM Cortex-M3 MCU, 20 MHz, 8 KB Flash

MPNLM3S101-EQN20-C2T
NRND

Texas Instruments Stellaris® ARM® Cortex®-M3S 100 series LM3S101-EQN20-C2T, 32-bit single-core MCU, 20 MHz, 8 KB Flash, 2 KB SRAM, 18 I/O, 48-LQFP, -40°C to 105°C.

$4.3321Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S101-EQN20-C2T 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~105°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)18
Core processorARM® Cortex®-M3
Case48-LQFP
Program memory size8KB (8K x 8)

Product details

Memory budget: 8 KB Flash, 2 KB SRAM

The 8 KB Flash (8K x 8) holds the application code and constant tables; a typical UART-to-SPI bridge or a PWM fan controller fits, leaving margin for a small bootloader.

Industrial temperature and on-chip peripherals

The internal oscillator eliminates the external crystal for basic timing, saving two pins and board space. On-chip brown-out detect, POR, PWM, and a watchdog timer reduce external supervisor IC count. Connectivity covers Microwire, SPI, SSI, and UART/USART — enough to talk to common serial ADCs, DACs, or radio modules.

Frequently asked questions

Is LM3S101-EQN20-C2T obsolete or end-of-life?

The LM3S101-EQN20-C2T is NRND (Not Recommended for New Designs) — it is not yet fully discontinued, but TI is phasing out support. For existing production, it remains available through independent distributors on a quoted-to-order basis.

What is the recommended replacement for LM3S101-EQN20-C2T?

Texas Instruments has not published an official direct replacement for this exact order code. For a pin-compatible upgrade within the Stellaris 100 series, consider the LM3S102 variants (same 48-LQFP package, larger Flash/RAM) — but verify firmware and register compatibility against the respective datasheets before requalifying.

What are the complete specifications of LM3S101-EQN20-C2T?

Key specs: 32-bit ARM Cortex-M3 core at 20 MHz, 8 KB Flash, 2 KB SRAM, 18 I/O, internal oscillator, peripherals including brown-out detect, POR, PWM, WDT, and connectivity via Microwire, SPI, SSI, UART/USART. Operating temperature -40°C to 105°C, supply voltage 3 V to 3.6 V, in a 48-LQFP (7x7 mm) package.