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Texas Instruments LM3S5791-IBZ80-C5 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5791-IBZ80-C5 Stellaris ARM Cortex-M3 MCU, 80 MHz

MPNLM3S5791-IBZ80-C5
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series, LM3S5791-IBZ80-C5, 32-bit single-core MCU, 80 MHz, 128 KB FLASH, 64 KB SRAM, 72 I/O, CAN/USB OTG/EBI/SPI/UART, 108-BGA (10x10 mm), 1.08–1.32 V, -40 to 85°C.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5791-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 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
Case108-LFBGA
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

Any future procurement runs through independent distribution — verified stock, date-code rotation, and traceability handled per order.

108-ball BGA — layout and rework notes

Housed in a 108-ball LFBGA with a 10x10 mm body and 0.8 mm pitch. No exposed thermal pad — all heat dissipates through the BGA balls into the inner-layer copper pours. Supply range is 1.08 V to 1.32 V core, so a dedicated 1.2 V rail is needed — not a 3.3 V single-supply part. The 1.2 V rail must be clean and local to the BGA; a small LDO from the 3.3 V system rail works if the 80 MHz core current (around 50–80 mA typical) is within the LDO's rating.

On-chip data converters: 16-channel 10-bit ADC, enough for analog sensor acquisition in a motor-drive or power-monitoring role. Peripherals include PWM, QEI (for quadrature encoder inputs), I²S audio, and a watchdog timer.

Frequently asked questions

What is the direct replacement for LM3S5791-IBZ80-C5?

Texas Instruments has not published an official direct replacement for this part. Within the same Stellaris family, the LM3S5791-IBZ80-C4 shares the same 80 MHz core and 108-BGA package but may differ in Flash or SRAM density — verify the memory sizing against your firmware image before cross-referencing. For new designs, consider migrating to a current-production TI Cortex-M4 or TM4C series part.