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Texas Instruments LM3S5K31-IBZ80-C5 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5K31-IBZ80-C5 Stellaris ARM Cortex-M3 MCU, 80MHz

MPNLM3S5K31-IBZ80-C5
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series LM3S5K31-IBZ80-C5, 32-bit single-core MCU, 80MHz, 128KB Flash, 24K x 8 RAM, 108-LFBGA, -40°C to 85°C.

Texas Instruments LM3S5K31-IBZ80-C5 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5K31-IBZ80-C5 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
PackageTray
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

What this Stellaris MCU brings to a control design

The LM3S5K31-IBZ80-C5: The 108-ball BGA package (10x10 mm) keeps the footprint compact, but the fine pitch demands careful PCB layout and controlled reflow profiles.

Peripheral set and memory — sizing the BOM fit

The 24 KB SRAM is modest by today's standards — firmware teams should budget tightly for stack and DMA buffers, especially when using the USB or CAN stacks.

Expect date codes to be non-current, and plan for incoming inspection to verify authenticity and condition.

Package and assembly notes for the 108-BGA

The 108-LFBGA (10x10 mm body) uses a 0.8 mm ball pitch — standard for BGA rework stations but tight for hand assembly. Supply voltage is 1.08 V to 1.32 V core, which means a dedicated 1.2 V rail is needed alongside the 3.3 V I/O supply. Plan for a separate LDO or switching regulator for the core rail.