Skip to main content
Log in
Texas Instruments LM3S9781-IQC80-C3 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S9781-IQC80-C3 Stellaris ARM Cortex-M3 MCU, 80 MHz, 128 KB Flash

MPNLM3S9781-IQC80-C3
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 9000 series MCU, LM3S9781-IQC80-C3, 32-bit single-core at 80 MHz, 128 KB Flash, 64 KB SRAM, 65 I/O, Ethernet, CAN, USB OTG, 100-LQFP, -40°C to 85°C.

Texas Instruments LM3S9781-IQC80-C3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S9781-IQC80-C3 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 9000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.235V ~ 1.365V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTray
RAM size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
ConnectivityCANbus, EBI/EMI, Ethernet, I²C, IrDA, LINbus, Microwire, SPI, SSI, UART/USART, USB OTG
Number of i (O)65
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

80 MHz Cortex-M3 with Ethernet and CAN — what this MCU was built for

The LM3S9781-IQC80-C3: 32-bit ARM Cortex-M3 MCU from the Stellaris 9000 series, running at 80 MHz with 128 KB Flash and 64 KB SRAM. Connectivity includes Ethernet, CAN, USB OTG, and multiple UART/SPI/I²C.

128 KB Flash — tight for Ethernet stacks

128 KB of program Flash is adequate for a lightweight TCP/IP stack plus a CANopen node, but leaves little room for a full web server or multiple protocol stacks simultaneously. Designs that pushed the StellarisWare library to its limits often hit the Flash ceiling and had to strip features or move to a higher-density sibling. The 64 KB SRAM is generous for a Cortex-M3 of this vintage, supporting moderate packet buffering without external memory.

Obsolete — no official replacement listed

Frequently asked questions

Is LM3S9781-IQC80-C3 obsolete?

Yes, the LM3S9781-IQC80-C3 is obsolete with no last-time-buy window active. Sourcing is through surplus and independent distribution only.

Where can I buy LM3S9781-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 — no stock or price figures are published here.

What are the specifications of LM3S9781-IQC80-C3?

Key specs: ARM Cortex-M3 at 80 MHz, 128 KB Flash, 64 KB SRAM, 65 GPIO, Ethernet MAC+PHY, CAN 2.0B, USB OTG, 16-channel 10-bit ADC, 100-LQFP, -40°C to 85°C, 1.235 V to 1.365 V core supply.