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Texas Instruments LM3S5791-IQC80-B1 — Microcontrollers & Processors (MCU / MPU / DSP)

Texas Instruments LM3S5791-IQC80-B1 ARM Cortex-M3 MCU, 80MHz

MPNLM3S5791-IQC80-B1
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5791-IQC80-, 32-bit ARM Cortex-M3 single-core MCU, 80MHz, 128KB FLASH, 64KB SRAM, 72 I/O, USB OTG, CAN, LIN, SPI, I²C, 100-LQFP, -40 to 85°C, tray.

Texas Instruments LM3S5791-IQC80-B1 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5791-IQC80-B1 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 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 USB OTG and CAN — what the peripheral set means

The LM3S5791-IQC80-B1: USB OTG (On-The-Go) lets the MCU act as either host or device, useful for data-logging pendrives or direct connection to a tablet for field diagnostics. Dual CAN 2.0 controllers support industrial and automotive networks alongside LIN and IrDA — a combination that reduces BOM count in multi-protocol gateway designs. The 16-channel 10-bit ADC samples at up to 1 Msps, adequate for current sensing and temperature monitoring in motor drives.

Obsolete — sourcing path for sustainment programs

The LM3S5791-IQC80- carries an Obsolete lifecycle status. TI has ended production; no last-time-buy window remains open. For existing designs already qualified on this MCU, the independent distribution channel is the practical sourcing route. No official TI successor has been published for this exact order code, so any replacement requires a full design review of pin-compatible Stellaris family options or a migration to a newer Cortex-M4 platform.

Frequently asked questions

Is LM3S5791-IQC80- obsolete?

Yes, the LM3S5791-IQC80- is listed as Obsolete. Texas Instruments has discontinued production, and no last-time-buy window remains active.

What is the replacement for LM3S5791-IQC80-?

TI has not published an official direct replacement for this exact order code. The Stellaris family includes pin-compatible variants with different memory and peripheral mixes, but any substitution requires reviewing the specific BOM requirements — flash size, SRAM, USB OTG, and CAN availability — against the remaining Stellaris portfolio or a migration to a newer Cortex-M4 series MCU.

Where can I buy LM3S5791-IQC80-?

We source the LM3S5791-IQC80- through independent distribution channels. Submit an RFQ for current availability and pricing — quotes are confirmed at time of request.

Can LM3S5791-IQC80- be used for USB OTG applications?

Yes, the LM3S5791-IQC80- includes a USB OTG controller, allowing it to operate as either a USB host or device. This makes it suitable for applications like direct connection to USB flash drives, keyboards, or host-to-PC communication without an external USB host chip.