The 80 MHz Cortex-M3 core, combined with the DMA controller and a 12-bit ADC with 16 channels, handles real-time control loops and data acquisition without stalling the CPU on every conversion. If your firmware footprint or throughput needs exceed this, you are looking at a higher-density Stellaris or a Cortex-M4 part.
LM3S5G31-IBZ80-A1 Stellaris ARM Cortex-M3 MCU, 80 MHz, 384 KB Flash
MPNLM3S5G31-IBZ80-A1
Obsolete
Texas Instruments Stellaris ARM Cortex-M3S 5000 series 32-bit MCU, LM3S5G31-IBZ80-A1, 80 MHz, 384 KB Flash, 64K x 8 RAM, 67 I/O, 108-BGA, -40 to 85°C.
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Series | Stellaris® ARM® Cortex®-M3S 5000 |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 3V ~ 3.6V |
| Operating temperature | -40°C~85°C(TA) |
| Speed | 80MHz |
| Package | Tray |
| RAM size | 64K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT |
| Connectivity | CANbus, EBI/EMI, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART |
| Number of i (O) | 67 |
| Core processor | ARM® Cortex®-M3 |
| Case | 108-LFBGA |
| Data converters | A/D 16x12b |
| Program memory size | 384KB (384K x 8) |
Product details
Frequently asked questions
Is LM3S5G31-IBZ80-A1 obsolete?
Yes, the LM3S5G31-IBZ80-A1 is obsolete. The manufacturer has discontinued this Stellaris MCU with no last-time-buy window remaining. Supply is limited to surplus available via RFQ confirmation through independent distributors.
What is the replacement for LM3S5G31-IBZ80-A1?
There is no pin-compatible drop-in replacement from TI. The Stellaris series has been superseded by the Tiva C series, but those MCUs use different packages and peripheral sets. A board redesign targeting a Tiva TM4C or a comparable Cortex-M4 part is the recommended path.
What are the key specifications of LM3S5G31-IBZ80-A1?
This is a 32-bit ARM Cortex-M3 MCU running at 80 MHz, with 384 KB Flash, 64K x 8 RAM, 67 I/O, a 16-channel 12-bit ADC, and interfaces including CAN, I²C, SPI, UART, and LIN. It operates from 3V to 3.6V and is rated for -40°C to 85°C. The package is a 108-BGA (10x10 mm).