Skip to main content
Log in
Texas Instruments LM3S5791-IQC80-C5T — Microcontrollers & Processors (MCU / MPU / DSP)

Texas Instruments LM3S5791-IQC80-C5T ARM Cortex-M3 MCU, 80 MHz

MPNLM3S5791-IQC80-C5T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5791-IQC80-C5T, 32-bit MCU, 80 MHz, 128 KB Flash, 64 KB RAM, 72 I/O, USB OTG, CAN, 100-LQFP, -40°C to 85°C.

Texas Instruments LM3S5791-IQC80-C5T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5791-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 size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
ConnectivityCANbus, EBI/EMI, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG
Number of i (O)72
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

80 MHz Cortex-M3 with industrial-grade peripherals

The Texas Instruments LM3S5791-IQC80-C5T is a 32-bit ARM Cortex-M3 MCU from the Stellaris family, clocked at 80 MHz with 128 KB of Flash and 64 KB of RAM. This combination of core speed, memory, and connectivity makes it a fit for industrial control nodes, motor-drive communication bridges, and gateway applications that need to aggregate CAN and serial fieldbuses onto a USB host interface.

The 80 MHz core clock on this Cortex-M3 supports a 3-stage pipeline. The 64 KB SRAM is organized as 64K x 8.

Frequently asked questions

What is the direct replacement for LM3S5791-IQC80-C5T?

There is no direct pin-compatible replacement for the LM3S5791-IQC80-C5T. The Stellaris family was superseded by TI's Tiva C series (TM4C123/129), which uses a Cortex-M4 core in a different pinout. A board redesign is required to migrate to a current-generation MCU.

Is LM3S5791-IQC80-C5T pin compatible with LM3S5790?

The LM3S5791 and LM3S5790 share the same 100-LQFP package and base pinout within the Stellaris family, but verify the specific peripheral and memory differences against the datasheet before assuming drop-in compatibility.

Where can I buy LM3S5791-IQC80-C5T with stock?

The LM3S5791-IQC80-C5T is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time. Submit an RFQ for a real-time sourcing check on remaining inventory.

What is LM3S5791-IQC80-C5T's listed speed?

The LM3S5791-IQC80-C5T is rated for an 80 MHz core clock on the ARM Cortex-M3 processor.