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Texas Instruments LM3S1637-EQC50-A2 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S1637-EQC50-A2 Stellaris ARM Cortex-M3 MCU, 50MHz

MPNLM3S1637-EQC50-A2
End of Life

Texas Instruments Stellaris® ARM® Cortex®-M3S 1000 series LM3S1637-EQC50-A2, 32-Bit Single-Core MCU, 50MHz, 128KB Flash, 32K x 8 RAM, 100-LQFP, -40°C to 105°C.

Texas Instruments LM3S1637-EQC50-A2 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM3S1637-EQC50-A2 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 1000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))2.25V ~ 2.75V
Operating temperature-40°C ~ 105°C (TA)
Speed50MHz
RAM size32K x 8
Core size32-Bit Single-Core
PackageTray
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
ConnectivityI2C, IrDA, Microwire, QEI, SPI, SSI, UART/USART
Number of i (O)43
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 4x10b
Program memory size128KB (128K x 8)

Product details

50 MHz Cortex-M3 with 128 KB Flash — the BOM-fit tier

With 43 general-purpose I/O lines and four 10-bit ADC channels, it can handle sensor input, actuator drive, and serial communication in a single chip.

The supply range of 2.25V to 2.75V is tighter than the typical 3.3V MCU — the board's power rail must be regulated to that window, so a dedicated LDO or buck converter is expected. Do not assume a 3.3V rail will work without a regulator stage.

100-LQFP package — footprint and routing

The 14 mm body is a common size for mid-density MCUs, so PCB layout guidelines are well-established.

Frequently asked questions

What is LM3S1637-EQC50-A2's listed speed?

The core is rated for 50 MHz. This is the maximum clock frequency for the ARM Cortex-M3 processor core in this device. At 50 MHz, the part handles control loops, protocol processing, and moderate data throughput typical of industrial and embedded applications.