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Texas Instruments LM3S5P31-IBZ80-C1 — Microcontrollers & Processors (MCU / MPU / DSP)

Texas Instruments LM3S5P31-IBZ80-C1 ARM Cortex-M3 MCU, 80MHz, 64KB Flash

MPNLM3S5P31-IBZ80-C1
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5P31-IBZ80-C1, 32-bit single-core MCU at 80MHz, 64KB Flash, 24KB RAM, USB OTG, CAN, 67 I/O, 108-LFBGA, -40°C to 85°C, tray.

Texas Instruments LM3S5P31-IBZ80-C1 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5P31-IBZ80-C1 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 size64KB (64K x 8)

Product details

The LM3S5P31-IBZ80-C1 is a 32-bit ARM Cortex-M3 MCU from the Stellaris 5000 series, clocked at 80 MHz with 64 KB of Flash and 24 KB of RAM.

This part is marked obsolete by Texas Instruments. No official replacement part number has been published by TI for this exact order code.

The 80 MHz core speed on a Cortex-M3 puts this MCU in the mid-range tier for control-loop and protocol-stack tasks — fast enough to run a Modbus TCP stack alongside a PID loop, but not a candidate for high-rate sensor fusion or video processing. The 64 KB Flash limits firmware to a single application image; field-upgrade strategies need an external serial Flash for OTA staging.

Package and integration note

The 1.08 V to 1.32 V core supply needs a dedicated regulator.

Frequently asked questions

What is the replacement for LM3S5P31-IBZ80-C1?

Texas Instruments has not published an official replacement order code for the LM3S5P31-IBZ80-C1. For a pin-compatible alternative within the Stellaris family, review the LM3S5Pxx series variants — but verify the exact peripheral set and memory size against your BOM.

What is the operating temperature range of LM3S5P31-IBZ80-C1?

The LM3S5P31-IBZ80-C1 is rated for -40°C to 85°C, covering industrial and outdoor telecom environments.