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Texas Instruments LM3S5D51-IQC80-A2T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5D51-IQC80-A2T Stellaris ARM Cortex-M3 MCU, 80 MHz

MPNLM3S5D51-IQC80-A2T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5D51-IQC80-A2T, 32-bit single-core MCU, 80 MHz, 512 KB Flash, 96 KB SRAM, 100-LQFP, -40°C to 85°C, 67 I/O, USB OTG, CAN, multiple serial interfaces.

Texas Instruments LM3S5D51-IQC80-A2T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5D51-IQC80-A2T 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
PackageTape & Reel (TR)
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

80 MHz core and 512 KB Flash — what they mean for fit

The 80 MHz ARM Cortex-M3 core delivers enough throughput for real-time control loops, protocol stacks (USB, CAN, TCP/IP offload), and moderate DSP tasks. The 512 KB Flash is generous for firmware with a full communication stack and application logic; the 96 KB SRAM supports multiple buffers and data queues without external memory. The 67 I/O pins, combined with the ADC and serial interfaces, make this a single-chip solution for a control board that needs to talk to sensors, actuators, and a host computer over USB or CAN.

Supply voltage is 3.0 V to 3.6 V, typical for a 3.3 V system rail.

Frequently asked questions

What is the replacement or equivalent for LM3S5D51-IQC80-A2T?

For a new design, consider current-generation Cortex-M3 or Cortex-M4 MCUs from TI or other manufacturers with similar peripheral sets (USB OTG, CAN, 512 KB Flash). For sustaining an existing BOM, sourcing through independent distribution is the practical option.