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Texas Instruments LM3S5K31-IBZ80-C5T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5K31-IBZ80-C5T Stellaris ARM Cortex-M3 MCU, 80MHz

MPNLM3S5K31-IBZ80-C5T
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series 32-bit MCU, LM3S5K31-IBZ80-C5T, 80MHz, 128KB Flash, 24KB RAM, 67 I/O, CAN/USB/I²C/SPI/UART, -40°C to 85°C, 108-BGA.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5K31-IBZ80-C5T specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 5000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.08V ~ 1.32V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTape & Reel (TR)
RAM size24K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB
Number of i (O)67
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

80 MHz Cortex-M3 with industrial connectivity

The Texas Instruments LM3S5K31-IBZ80-C5T is a 32-bit ARM Cortex-M3 MCU from the Stellaris 5000 series, clocked at 80 MHz with 128 KB of Flash and 24 KB of RAM. It carries a full peripheral set including CAN, USB, I²C, SPI, SSI, UART, IrDA, and a quadrature encoder interface, plus 16-channel 10-bit ADC and PWM.

The Cortex-M3 core runs at 80 MHz. The 24 KB RAM is the tighter resource.

Connectivity and I/O in a 10x10 BGA

The 108-ball BGA (10x10 mm) provides 67 GPIOs. Connectivity includes CAN, USB, I²C, SPI, SSI, UART, IrDA, Microwire, and QEI.

Frequently asked questions

What is the closest pin-compatible alternative to LM3S5K31-IBZ80-C5T?

No official pin-compatible successor is listed in the available records. The Stellaris family was succeeded by TI's Tiva C series, but pin compatibility varies by package and peripheral set. A design review with the target Tiva C part number is recommended before substitution.

What is LM3S5K31-IBZ80-C5T's listed speed?

The core is rated at 80 MHz, delivering approximately 100 DMIPS on the Cortex-M3 pipeline.