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Texas Instruments LM3S6637-EQC50-A2 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S6637-EQC50-A2 Stellaris ARM Cortex-M3 MCU, 50 MHz

MPNLM3S6637-EQC50-A2
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 6000 series LM3S6637-EQC50-A2, 32-Bit Single-Core MCU, 50MHz, 128KB Flash, 32K x 8 RAM, Ethernet & serial connectivity, 100-LQFP, -40°C to 105°C.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S6637-EQC50-A2 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 6000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))2.25V ~ 2.75V
Operating temperature-40°C~105°C(TA)
Speed50MHz
PackageTray
RAM size32K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
ConnectivityEthernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART
Number of i (O)41
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 4x10b
Program memory size128KB (128K x 8)

Product details

50 MHz Cortex-M3 — processing budget and bus margin

The 50 MHz core speed, combined with the 32-bit ARM Cortex-M3 architecture, delivers a predictable 1.25 MIPS/MHz throughput. For a design handling a TCP/IP stack alongside real-time I/O, this means the firmware team needs to budget interrupt latency and context-switch overhead early — the 50 MHz ceiling is adequate for moderate-throughput Ethernet applications but leaves no headroom for heavy DSP or graphics. If the application code plus a lightweight IP stack exceeds 80 KB of Flash, or the data buffers consume more than 20 KB of RAM, the engineer should consider a higher-density sibling before committing the BOM.

Pair it with an external PHY (e.g., DP83848) and a magnetics module. The 41 GPIOs remain available for parallel buses, discrete I/O, or additional serial channels after the Ethernet interface is wired.

Peripherals and data conversion

On-chip peripherals include brown-out detection, power-on reset, PWM outputs, and a watchdog timer — enough for standalone operation without external supervisory ICs. The 4-channel 10-bit ADC covers basic analog sensing (temperature, current, voltage monitoring) but is not suited for precision instrumentation or high-speed data acquisition.

Obsolete — sourcing and replacement strategy

The official lifecycle status is Obsolete. Texas Instruments has discontinued this exact order code, and no direct pin-compatible replacement is recorded in the available documentation.

Frequently asked questions

Does LM3S6637-EQC50-A2 have Ethernet connectivity?

Yes, it integrates an Ethernet MAC controller, along with I²C, IrDA, Microwire, SPI, SSI, and UART/USART interfaces. An external PHY is required for the physical-layer connection.

What is the closest pin-compatible alternative to LM3S6637-EQC50-A2?

The Stellaris M3S 6000 series includes other density and feature variants, but differences in Flash size, RAM, and peripheral count mean each requires a separate PCB layout and firmware port. A full datasheet comparison is needed to identify the best migration candidate for a given application.