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Texas Instruments LM3S5D91-IQC80-A2 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5D91-IQC80-A2 Stellaris ARM Cortex-M3 MCU, 80 MHz

MPNLM3S5D91-IQC80-A2
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series MCU, LM3S5D91-IQC80-A2, 32-bit single-core, 80 MHz, 512 KB Flash, 96 KB RAM, 100-LQFP, -40°C to 85°C.

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

Specifications

LM3S5D91-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, EBI/EMI, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG
Number of i (O)72
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 16x12b
Program memory size512KB (512K x 8)

Product details

The LM3S5D91-IQC80-A2: There is also a 16-channel 12-bit ADC, PWM outputs, a quadrature encoder interface (QEI) for motor feedback, and an I²S audio interface. With 72 general-purpose I/O pins, it can handle a mix of sensors, actuators, and human-machine interfaces in a single-chip design.

The LM3S5D91-IQC80-A2 is listed as Obsolete. Texas Instruments has discontinued production, and no last-time-buy window remains open through the factory channel. Availability and pricing are confirmed only at the time of quotation, and lead times depend entirely on what is physically on hand in the channel. For repair, retrofit, or short-run production, sourcing this exact part through independent distribution is the practical path.

Frequently asked questions

Is LM3S5D91-IQC80-A2 obsolete?

Yes, the LM3S5D91-IQC80-A2 is listed as Obsolete. Texas Instruments has discontinued production, and the part is no longer available through the factory channel. It can be sourced through independent distributors who hold surplus or verified inventory.

What is the replacement for LM3S5D91-IQC80-A2?

Pin-compatible Stellaris family members (e.g., LM3S9D90, LM3S5B91) may be considered, but a full design review is required to confirm fit. For existing BOMs, sourcing the exact part through independent distribution is the recommended approach.