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Texas Instruments LM3S5D51-IQC80-A2 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5D51-IQC80-A2 Stellaris ARM Cortex-M3 MCU, 80 MHz, 512 KB Flash

MPNLM3S5D51-IQC80-A2
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series LM3S5D51-IQC80-A2, 32-bit single-core MCU, 80 MHz, 512 KB Flash, 96 KB RAM, 16x12-bit ADC, 67 I/O, 100-LQFP, -40°C to 85°C.

Texas Instruments LM3S5D51-IQC80-A2 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5D51-IQC80-A2 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 5000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))3V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTray
RAM size96K 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
Case100-LQFP
Data convertersA/D 16x12b
Program memory size512KB (512K x 8)

Product details

The LM3S5D51-IQC80-A2 is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris 5000 series, clocked at 80 MHz with 512 KB Flash and 96 KB RAM. It includes a 16-channel 12-bit ADC, USB OTG, CAN, and multiple serial interfaces. The 100-pin LQFP package exposes 67 GPIOs.

The Cortex-M3 core runs at 80 MHz. The 512 KB Flash and 96 KB RAM support a single motor axis with field-oriented control plus a Modbus TCP stack.

Texas Instruments has marked the LM3S5D51-IQC80-A2 as obsolete. No official successor part number is listed. For this order code, the supply channel is the independent surplus and broker market. We source and quote this part to order against an RFQ.

Peripheral set and deployment context

Peripherals include brown-out detect/reset, DMA, I²S, POR, PWM, and WDT. Connectivity covers CAN, I²C, IrDA, LIN, Microwire, QEI, SPI, SSI, UART/USART, and USB OTG.

Frequently asked questions

What is the replacement for LM3S5D51-IQC80-A2?

No official replacement part number is listed in the lifecycle record. For a new design, consider the current Stellaris or Tiva C Series from TI, which offer Cortex-M4 cores and similar peripheral sets. For an existing board, a pin-compatible alternative within the same family may exist — verify the footprint and memory map before substituting.

What is LM3S5D51-IQC80-A2's listed speed?

The core is rated at 80 MHz, which delivers about 100 DMIPS on the Cortex-M3 pipeline.

What is the pinout of LM3S5D51?

The LM3S5D51-IQC80-A2 is packaged in a 100-pin LQFP (14x14 mm). The pinout is documented in the Texas Instruments datasheet for the Stellaris LM3S5D51. We can provide the datasheet upon request.