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Texas Instruments LM3S5K36-IQR80-C3 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5K36-IQR80-C3 Stellaris ARM Cortex-M3 MCU, 80MHz

MPNLM3S5K36-IQR80-C3
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series 32-bit MCU, LM3S5K36-IQR80-C3, 80 MHz core, 128 KB Flash, 24 KB RAM, 33 I/O, CAN/USB/SPI/I²C, -40°C to 85°C, 64-LQFP.

Texas Instruments LM3S5K36-IQR80-C3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5K36-IQR80-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 size24K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB
Number of i (O)33
Core processorARM® Cortex®-M3
Case64-LQFP
Data convertersA/D 8x10b
Program memory size128KB (128K x 8)

Product details

The LM3S5K36-IQR80-C3: The LM3S5K36 is a 32-bit ARM Cortex-M3 microcontroller from the Texas Instruments Stellaris 5000 series, clocked at 80 MHz.

80 MHz is a mid-range operating point for a Cortex-M3. It gives you enough throughput for a real-time control loop with sensor polling and a CAN message stack running concurrently, but it is not a high-end part for heavy DSP or graphics.

Memory and peripherals — sizing the design

128 KB of Flash and 24 KB of RAM fit firmware for a CANopen or Modbus node with a modest data table. The 33 GPIOs cover a small keypad, a few LEDs, and the bus transceiver control lines.

The LM3S5K36 is marked obsolete by Texas Instruments. No last-time-buy window remains open through the franchised channel.

Frequently asked questions

Where can I buy LM3S5K36-IQR80-C3 and get a price?

We source the LM3S5K36-IQR80-C3 through our independent distribution network. Submit an RFQ for current availability and pricing — quantities and price are confirmed at quote time, not listed publicly.

What is the closest pin-compatible alternative to LM3S5K36-IQR80-C3?

No official pin-compatible replacement from Texas Instruments is listed in the product documentation for this obsolete order code. For a new design, consider the active TM4C123 series from TI, which shares the Cortex-M4 core and a similar peripheral set but requires a layout review.

What is LM3S5K36-IQR80-C3's listed speed?

The core runs at 80 MHz. That is the maximum clock frequency for this Cortex-M3 device, as specified in the product documentation.

What series is LM3S5K36-IQR80-C3 from?

It belongs to the Stellaris ARM Cortex-M3S 5000 series from Texas Instruments. That series targets industrial and communication applications with a rich peripheral set.