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Texas Instruments LM3S5D91-IBZ80-A2T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5D91-IBZ80-A2T Stellaris ARM Cortex-M3 MCU, 80 MHz, 512 KB Flash

MPNLM3S5D91-IBZ80-A2T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5D91-IBZ80-A2T, 32-bit single-core MCU, 80 MHz, 512 KB Flash, 96 KB RAM, 72 I/O, CANbus/USB OTG/EBI/EMI, 108-LFBGA, -40 to 85 °C.

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

Specifications

LM3S5D91-IBZ80-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, EBI/EMI, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG
Number of i (O)72
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 16x12b
Program memory size512KB (512K x 8)

Product details

The 80 MHz core with single-cycle multiply and hardware divide handles real-time control loops and protocol stacks without external memory. The 512 KB Flash is enough for a full TCP/IP stack plus application firmware; the 96 KB RAM supports moderate-sized data buffers. Designs that need more than 96 KB of working memory will require an external SRAM via the EBI/EMI interface.

Connectivity and I/O — a single-chip gateway

USB OTG, CAN, I²C, SPI, UART, and IrDA are on-chip. The 72 GPIOs in a 108-ball BGA leave room for a parallel LCD or external memory bus.

Frequently asked questions

Is LM3S5D91-IBZ80-A2T obsolete?

Yes, this part is officially obsolete and no longer in production. It must be sourced through surplus or broker channels.

What is the replacement for LM3S5D91-IBZ80-A2T?

Texas Instruments has not designated a direct pin-compatible replacement for this exact BGA variant. Any substitution requires a design review of the new MCU's footprint, memory map, and peripheral set.

Where can I buy LM3S5D91-IBZ80-A2T?

This obsolete part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a real-time sourcing check.

What are the specifications of LM3S5D91-IBZ80-A2T?

It is a 32-bit ARM Cortex-M3 MCU running at 80 MHz with 512 KB Flash, 96 KB RAM, 72 I/O, USB OTG, CAN, and 16-channel 12-bit ADC in a 108-BGA package rated for -40 to 85 °C.

Can LM3S5D91-IBZ80-A2T be used in new designs?

No, because the part is obsolete and not in production. New designs should select a current-production Cortex-M3 or Cortex-M4 MCU with similar peripheral integration.