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Texas Instruments LM3S5K31-IQC80-C5T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5K31-IQC80-C5T Stellaris ARM Cortex-M3 MCU, 80MHz, 128KB Flash

MPNLM3S5K31-IQC80-C5T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5K31-IQC80-C5T, 32-bit MCU, 80MHz, 128KB Flash, 24KB RAM, CAN/USB/I2C/SPI/UART, 100-LQFP, -40°C to 85°C.

Texas Instruments LM3S5K31-IQC80-C5T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5K31-IQC80-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
Case100-LQFP
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

The LM3S5K31-IQC80-C5T is a Texas Instruments Stellaris ARM Cortex-M3 MCU running at 80 MHz with 128 KB of Flash program memory and 24 KB of RAM.

Obsolete — sourcing through surplus channels

This part is marked obsolete by the manufacturer. If you are freezing a BOM for a new design, look for a current-production Cortex-M3 or Cortex-M4 from TI's Tiva or Stellaris successor families; for a legacy repair or a production run that cannot requalify, we can quote the LM3S5K31-IQC80-C5T against your volume and delivery window.

Connectivity and peripheral set

The MCU integrates CAN, USB, UART, SPI, I2C, IrDA, LIN, and Microwire interfaces. The 16-channel 10-bit ADC samples for motor current sensing or analog input scanning.

Supply voltage and power considerations

Core and I/O run from a single 1.08 V to 1.32 V supply.

Frequently asked questions

What is LM3S5K31-IQC80-C5T's listed speed?

The core runs at 80 MHz, which is the maximum clock frequency for this Cortex-M3 device. That speed supports moderate control loops and protocol stacks without external PLL configuration.

What is the operating temperature range for LM3S5K31-IQC80-C5T?

It is rated for -40°C to 85°C ambient, which covers industrial and outdoor telecom enclosures. Not qualified for automotive under-hood or extended-temperature downhole applications.