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Texas Instruments LM3S5D91-IQC80-A1T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5D91-IQC80-A1T Stellaris ARM Cortex-M3 MCU, 80 MHz

MPNLM3S5D91-IQC80-A1T
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series LM3S5D91-IQC80-A1T, 32-bit MCU, 80 MHz, 512KB Flash, 96K x 8 RAM, CAN, USB OTG, 100-LQFP, -40°C to 85°C.

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

Specifications

LM3S5D91-IQC80-A1T 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, 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

Stellaris Cortex-M3 with 80 MHz core and 512 KB Flash

On-chip data conversion comes from a 16-channel, 12-bit ADC.

Peripheral set and design-fit note

Brown-out reset and power-on reset are integrated, reducing external supervisor IC count. The 12-bit ADC with 16 channels covers multi-sensor analog front ends without an external mux. For designs that need the full 80 MHz throughput, the Flash wait state must be configured correctly — the default zero-wait setting will hard-fault if the core clock exceeds the Flash access limit without a wait state inserted.

Frequently asked questions

Is LM3S5D91-IQC80-A1T obsolete and discontinued?

Yes, the LM3S5D91-IQC80-A1T is listed as Obsolete. Texas Instruments has discontinued production, and no direct replacement part number has been designated.

What is the replacement for LM3S5D91-IQC80-A1T?

For a pin-compatible alternative within the Stellaris family, review the LM3S series parametric table — a same-package, same-core variant with equivalent Flash and RAM may serve as a drop-in, but verify the peripheral set and supply voltage range against your design.