The LM3S5C56-IQR80-A2: This is a mid-range MCU suited for industrial control, motor drives, and communication gateways where the Cortex-M3 core handles protocol stacks and real-time loops without breaking a sweat.
For a board that.
LM3S5C56-IQR80-A2 Stellaris ARM Cortex-M3 MCU, 80 MHz
MPNLM3S5C56-IQR80-A2
Obsolete
Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5C56-IQR80-A2, 32-bit single-core MCU, 80 MHz, 512 KB Flash, 64 KB RAM, CAN/USB OTG, 33 I/O, 64-LQFP, -40°C 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 | Tube |
| RAM size | 64K 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 OTG |
| Number of i (O) | 33 |
| Core processor | ARM® Cortex®-M3 |
| Case | 64-LQFP |
| Data converters | A/D 8x12b |
| Program memory size | 512KB (512K x 8) |
Product details
Frequently asked questions
What is the replacement for LM3S5C56?
There is no official replacement listed in the record. The LM3S5C56-IQR80-A2 is a Stellaris-series part that has been discontinued without a direct successor. For a pin-compatible alternative within the same family, the LM3S5C66 is a close sibling, but it is also obsolete. A redesign using a current TI Cortex-M4 or Cortex-M0+ part would be the path for new production.