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Texas Instruments LM3S5K31-IBZ80-C1 — Microcontrollers & Processors (MCU / MPU / DSP)

TI LM3S5K31-IBZ80-C1 ARM Cortex-M3 MCU, 80 MHz, 128 KB Flash

MPNLM3S5K31-IBZ80-C1
Obsolete

Texas Instruments Stellaris LM3S5K31-IBZ80-C1, ARM Cortex-M3S 5000 series 32-bit MCU, 80 MHz, 128 KB Flash, 24 KB RAM, 67 I/O, USB/CAN/LIN/SPI/SSI, 16x10b ADC, 1.08V–1.32V core, -40°C to 85°C, 108-BGA.

Texas Instruments LM3S5K31-IBZ80-C1 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5K31-IBZ80-C1 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)67
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

The Texas Instruments LM3S5K31-IBZ80-C1 is listed as obsolete.

This Stellaris-series MCU runs an ARM Cortex-M3 core at 80 MHz, backed by 128 KB of Flash and 24 KB of SRAM. The 24 KB RAM handles typical data buffers and stack frames; if your application needs a large frame buffer or multiple DMA descriptors, budget the RAM allocation early.

Peripheral set — USB, CAN, and industrial connectivity

The LM3S5K31-IBZ80-C1 includes USB, CANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, and a 16-channel 10-bit ADC.

108-BGA package — layout considerations

The 108-BGA (10x10 mm) package requires a multilayer PCB. Core supply is 1.08 V to 1.32 V.

Frequently asked questions

What is the direct replacement for LM3S5K31-IBZ80-C1?

No official successor is listed on the record. For a pin-compatible alternative, evaluate other Stellaris LM3S5K31 variants (e.g., the -IBZ80-C1T, which differs only in packaging/tray quantity). For a current-production design, consider migrating to a newer TI Cortex-M4 or TM4C series device with similar peripheral sets.

Does LM3S5K31-IBZ80-C1 support USB and CAN simultaneously?

Yes. The connectivity list includes both USB and CANbus, and the 67 GPIOs plus internal peripheral multiplexing allow concurrent operation of USB and CAN in the same application.

What is the price for LM3S5K31-IBZ80-C1 in tray quantities?

Pricing is market-driven for this obsolete part and varies with available surplus stock. Submit an RFQ for a current quote in your target tray quantity.

Can LM3S5K31-IBZ80-C1 be used as a replacement for LM3S5K31-IBZ80-C1T?

The -C1 and -C1T suffixes typically indicate different packaging or shipping options (tray vs. tape-and-reel). The die and firmware are identical, so the -C1 can replace the -C1T in a design that accepts tray-supplied parts, provided the board footprint and BGA ball-out match.