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Texas Instruments LM3S5951-IQC80-C3T — Microcontrollers & Processors (MCU / MPU / DSP)

Texas Instruments LM3S5951-IQC80-C3T Stellaris ARM Cortex-M3 MCU, 80 MHz

MPNLM3S5951-IQC80-C3T
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series LM3S5951-IQC80-C3T, 32-bit single-core MCU, 80 MHz, 256 KB Flash, 64 KB RAM, 100-LQFP, -40°C to 85°C.

Texas Instruments LM3S5951-IQC80-C3T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5951-IQC80-C3T 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
PackageTape & Reel (TR)
RAM size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG
Number of i (O)67
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 16x10b
Program memory size256KB (256K x 8)

Product details

80 MHz Cortex-M3 with 256 KB Flash — what it was built for

The Texas Instruments LM3S5951-IQC80-C3T is a 32-bit ARM Cortex-M3 MCU from the Stellaris® 5000 series, clocked at 80 MHz with 256 KB of Flash and 64 KB of RAM.

Obsolete — sourcing reality for the BOM line

Memory sizing — 256 KB Flash, 64 KB RAM

256 KB of program Flash and 64 KB of RAM is the sweet spot for a mid-complexity embedded application. The Flash holds a full TCP/IP stack, a CANopen node, and a modest RTOS kernel with room left for application code. The 64 KB RAM is enough for two or three packet buffers, a display frame buffer at 320x240 monochrome, or a data-logging ring buffer for a few thousand sensor readings. If the firmware needs field-update capability, the Flash endurance is rated for the standard 100k write/erase cycles typical of this process node — adequate for OTA updates over a product lifetime, but not for wear-leveled file-system storage.

Frequently asked questions

Is LM3S5951-IQC80-C3T obsolete?

Yes, the LM3S5951-IQC80-C3T is marked obsolete by Texas Instruments. There is no official successor order code listed. The part is available through surplus and broker channels, sourced to order against an RFQ.

What is the replacement for LM3S5951-IQC80-C3T?

No official replacement or successor is listed in the lifecycle record. The Stellaris family has been phased out; TI's current Tiva-C and Hercules MCU lines are not pin-compatible. For a drop-in replacement, the only option is sourcing the exact LM3S5951-IQC80-C3T from surplus inventory.

Where can I buy LM3S5951-IQC80-C3T?

The LM3S5951-IQC80-C3T 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 a lot-specific quote including date-code spread and packaging condition.

What is LM3S5951-IQC80-C3T's listed speed?

The core runs at 80 MHz on a 32-bit ARM Cortex-M3 single-core processor. This is the maximum clock speed; the internal oscillator and PLL can generate it from an external crystal or the internal oscillator.

What is the LM3S5951-IQC80-C3T datasheet?

The datasheet covers the full Stellaris LM3S5000 series. It includes the electrical characteristics, pinout for the 100-LQFP package, memory map, peripheral register descriptions, and application notes for the CAN, USB, and serial interfaces.