At 20 MHz the Cortex-M3 executes single-cycle multiply and a hardware divide, so a PID loop or Modbus polling cycle completes in microseconds. The 2 KB SRAM limits data buffers — expect to handle one or two protocol frames at a time, not a multi-kilobyte log. The 8 KB Flash holds a modest firmware image; if your application needs field-upgradeable firmware over UART, budget the bootloader size against the remaining space.
LM3S101-IGZ20-C2 Stellaris ARM Cortex-M3 MCU, 20 MHz, 8 KB Flash
MPNLM3S101-IGZ20-C2
End of Life
Texas Instruments Stellaris® ARM® Cortex®-M3S 100 series LM3S101-IGZ20-C2, 32-bit MCU, 20 MHz, 8 KB Flash, 2 KB RAM, 18 I/O, 48-VQFN (7x7), -40 to 85°C.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Series | Stellaris® ARM® Cortex®-M3S 100 |
| 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 | 20MHz |
| Package | Tray |
| RAM size | 2K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | Microwire, SPI, SSI, UART/USART |
| Number of i (O) | 18 |
| Core processor | ARM® Cortex®-M3 |
| Case | 48-VFQFN Exposed Pad |
| Program memory size | 8KB (8K x 8) |
Product details
Frequently asked questions
Is LM3S101-IGZ20-C2 obsolete or end-of-life?
Yes, this part is end-of-life. No official replacement is listed. Sourcing is through independent distribution; we can quote to order against an RFQ.
What is the replacement for LM3S101-IGZ20-C2?
No official successor is documented. For a pin-compatible alternative, consider other Stellaris Cortex-M3 MCUs in the 48-VQFN package — verify memory and peripheral differences against your firmware.
Where can I buy LM3S101-IGZ20-C2?
We source this end-of-life part through independent distribution. Submit an RFQ for current availability and pricing — no stock or price figures are published here.
What are the specifications of LM3S101-IGZ20-C2?
32-bit ARM Cortex-M3 at 20 MHz, 8 KB Flash, 2 KB RAM, 18 I/O, 3.0–3.6 V supply, -40 to 85°C operating range, in a 48-VQFN (7x7 mm) package. Peripherals include brown-out detect, POR, PWM, WDT, and UART/SPI/SSI/Microwire interfaces.
What is the operating temperature range of LM3S101-IGZ20-C2?
Rated for -40°C to 85°C (TA), covering most industrial and outdoor enclosure environments.