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Texas Instruments LM3S5B91-IBZ80-C1T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5B91-IBZ80-C1T Stellaris ARM Cortex-M3 MCU, 80MHz

MPNLM3S5B91-IBZ80-C1T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5B91-IBZ80-C1T, 32-Bit Single-Core MCU, 80MHz, 256KB Flash, 96K x 8 RAM, 72 I/O, CANbus, USB OTG, 108-LFBGA, -40°C~85°C.

Texas Instruments LM3S5B91-IBZ80-C1T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5B91-IBZ80-C1T 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 size96K 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 size256KB (256K x 8)

Product details

The Texas Instruments LM3S5B91-IBZ80-C1T is a Stellaris ARM Cortex-M3S 5000 series 32-bit microcontroller running at 80 MHz.

The 96 KB RAM handles multiple frame buffers and a real-time OS heap. The 16-channel 10-bit ADC covers analog sensing for current monitoring or potentiometer feedback.

108-ball BGA — reflow only, no hand-soldering

This is not a hand-solderable part — it needs a solder-paste stencil and reflow oven. The 1.08 V to 1.32 V core supply requires a dedicated low-voltage rail, separate from the I/O bank.

The brown-out detect and POR help the core ride through supply dips without corrupting Flash.

Texas Instruments no longer manufactures the LM3S5B91-IBZ80-C1T.

Frequently asked questions

What is the replacement for LM3S5B91-IBZ80-C1T?

No official replacement has been recorded for the LM3S5B91-IBZ80-C1T. The Stellaris family was transitioned to the Tiva C series by Texas Instruments, but pin-compatibility is not confirmed. For existing designs, the only sourcing option is the independent surplus market.