Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series MCU, LM3S5K31-IQC80-C3, 32-bit single-core at 80MHz, 128KB Flash, 24K x 8 RAM, 67 I/O, 100-LQFP, -40°C~85°C.
| Parameter | Value |
|---|---|
| Series | Stellaris® ARM® Cortex®-M3S 5000 |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 1.08V ~ 1.32V |
| Operating temperature | -40°C~85°C(TA) |
| Speed | 80MHz |
| Package | Tray |
| RAM size | 24K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Connectivity | CANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB |
| Number of i (O) | 67 |
| Core processor | ARM® Cortex®-M3 |
| Case | 100-LQFP |
| Data converters | A/D 16x10b |
| Program memory size | 128KB (128K x 8) |
At 80 MHz the core can handle a PID loop update at several kilohertz while still servicing a CAN message queue and a USB bulk transfer.
This part is listed as obsolete.
The pin assignment for the 100-LQFP package is not carried in the sourcing record. Verify the pinout against the official TI datasheet before committing a board layout — the 100-pin LQFP footprint is standard, but signal-to-pin mapping varies across the Stellaris family.
Yes, the LM3S5K31-IQC80-C3 is listed as obsolete. TI no longer manufactures it, and standard distribution does not carry it.
The evidence does not list an official TI-specified replacement for this exact order code. A pin-compatible Stellaris family member with similar memory and peripheral set may exist, but any substitution requires a design review and validation. We can help source the original part through surplus channels.