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Texas Instruments LM3S5B91-IQC80-C3 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5B91-IQC80-C3 Stellaris ARM Cortex-M3 MCU, 80MHz

MPNLM3S5B91-IQC80-C3
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series LM3S5B91-IQC80-C3, 32-bit single-core MCU, 80MHz, 256KB Flash, 96K x 8 SRAM, 72 I/O, CANbus/USB OTG, -40°C~85°C, 100-LQFP.

Texas Instruments LM3S5B91-IQC80-C3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5B91-IQC80-C3 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 5000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.08V ~ 1.32V
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 16x10b
Program memory size256KB (256K x 8)

Product details

The Texas Instruments LM3S5B91-IQC80-C3 is a 32-bit ARM Cortex-M3 MCU from the Stellaris 5000 series, clocked at 80 MHz with 256 KB of Flash program memory and 96 KB of SRAM. It carries CAN, USB OTG, multiple UART/USART, I²C, SPI, and SSI connectivity, plus a 16-channel 10-bit ADC. The 72 general-purpose I/O lines, combined with the EBI/EMI bus, allow direct attachment of external memory or parallel peripherals without a CPLD. The internal oscillator and brown-out detect circuitry reduce external BOM count in space-constrained designs.

At 80 MHz, the Cortex-M3 pipeline delivers 96 KB of SRAM and a 16-channel 10-bit ADC.

Frequently asked questions

Is LM3S5B91-IQC80-C3 obsolete?

Yes, Texas Instruments has marked the LM3S5B91-IQC80-C3 as obsolete with no factory last-time-buy remaining. Supply is available through independent distribution channels.

What is the best replacement for LM3S5B91-IQC80-C3?

A current-generation TI Tiva-C or TM4C series Cortex-M4F MCU in the same 100-LQFP package is the recommended migration path. The pinout and peripheral set differ, so a firmware port and board-level validation are required — no drop-in replacement exists.

Where can I buy LM3S5B91-IQC80-C3?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the real-time picture.

What are the exact specifications of LM3S5B91-IQC80-C3?

The LM3S5B91-IQC80-C3 is a 32-bit ARM Cortex-M3 MCU running at 80 MHz with 256 KB Flash, 96 KB SRAM, 72 I/O, a 16-channel 10-bit ADC, and CAN/USB OTG connectivity, in a 100-LQFP package rated for -40°C to 85°C operation.