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Texas Instruments LM3S5651-IBZ80-C5 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5651-IBZ80-C5 Stellaris Cortex-M3 MCU, 80 MHz, 128 KB Flash

MPNLM3S5651-IBZ80-C5
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series 32-bit MCU, LM3S5651-IBZ80-C5, 80 MHz core, 128 KB Flash, 32 KB SRAM, 67 I/O, USB OTG, CAN, I²C, SPI, UART, 16-ch 10-bit ADC, -40°C to 85°C, 108-BGA.

Texas Instruments LM3S5651-IBZ80-C5 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5651-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 size32K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG
Number of i (O)67
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

80 MHz Cortex-M3 with USB OTG and CAN — field-service note

The LM3S5651-IBZ80-C5: Texas Instruments Stellaris ARM Cortex-M3S 5000 series 32-bit microcontroller. Peripherals include USB OTG, CANbus, I2C, SPI, UART, and a 16-channel 10-bit ADC. 108-ball BGA (10x10 mm), -40°C to 85°C.

At 80 MHz, the Cortex-M3 executes single-cycle multiply and hardware divide, so a PID loop or Modbus packet handler can run without wait-state stalls from Flash prefetch. The 32 KB SRAM leaves room for a double-buffered USB frame or a CAN message queue alongside the stack.

Connectivity mix: USB OTG plus CAN

USB OTG means the MCU can act as either a device (sensor data logger) or a host (flash drive for firmware update) on the same port. CANbus connects directly to industrial actuator networks without an external transceiver — just a CAN PHY chip. The QEI and PWM peripherals let it drive a brushed DC motor or read an incremental encoder without bit-banging GPIO.

Texas Instruments has marked the LM3S5651-IBZ80-C5 as Obsolete. No last-time-buy window remains open through the factory. No direct pin-compatible second source is recorded in TI's official cross-reference for this Stellaris part.

Frequently asked questions

What is LM3S5651-IBZ80-C5's core speed?

The ARM Cortex-M3 core runs at 80 MHz, which supports single-cycle multiply and hardware divide for real-time control loops.

What is the closest pin-compatible alternative?

No official TI cross-reference or pin-compatible second source is recorded for this exact Stellaris order code. For a drop-in replacement, verify the footprint and peripheral set against another Stellaris LM3S5xxx device in the same 108-BGA package.