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Texas Instruments LM3S9781-IQC80-C5T — Microcontrollers & Processors (MCU / MPU / DSP)

Texas Instruments LM3S9781-IQC80-C5T Stellaris ARM Cortex-M3 MCU, 80 MHz

MPNLM3S9781-IQC80-C5T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 9000 series 32-bit MCU, LM3S9781-IQC80-C5T, 80 MHz core, 128 KB Flash, 64 KB RAM, 65 I/O, Ethernet/CAN/USB OTG, 100-LQFP, -40°C to 85°C.

Texas Instruments LM3S9781-IQC80-C5T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S9781-IQC80-C5T 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
PackageTape & Reel (TR)
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 part does

The LM3S9781-IQC80-C5T: 32-bit ARM Cortex-M3 MCU from the Stellaris 9000 series, clocked at 80 MHz. It carries 128 KB of Flash and 64 KB of RAM.

128 KB Flash and 64 KB RAM — memory budget for a control gateway

The 128 KB program Flash and 64 KB SRAM are sized for a moderate firmware stack — a TCP/IP stack, CANopen or Modbus application layer, and a few hundred lines of control logic fit comfortably. The 64 KB RAM provides enough buffer space for Ethernet packet handling and a small data log. Designs requiring larger code or data sets (e.g., full web server with graphics) will need to step up to a higher-density sibling in the Stellaris family.

Frequently asked questions

How do I get current pricing and availability for LM3S9781-IQC80-C5T?

We source this obsolete part to order against an RFQ. Submit a request for quote (RFQ) through this listing; availability and current pricing are confirmed at quote time.

What is LM3S9781-IQC80-C5T's listed speed?

The core runs at 80 MHz, which is the maximum clock for this ARM Cortex-M3 device.

What is the closest pin-compatible alternative to LM3S9781-IQC80-C5T?

No official pin-compatible replacement has been designated by Texas Instruments. Any substitution requires a design review and validation.