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Texas Instruments LM3S6918-EQC50-A2T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S6918-EQC50-A2T Stellaris Cortex-M3 MCU, 50 MHz, 256 KB Flash, Ethernet

MPNLM3S6918-EQC50-A2T
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 6000 series 32-bit MCU, LM3S6918-EQC50-A2T, 50 MHz, 256 KB Flash, 64 KB RAM, Ethernet MAC+PHY, 8-channel 10-bit ADC, 38 GPIO, 100-LQFP, -40 to 105°C.

Texas Instruments LM3S6918-EQC50-A2T datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S6918-EQC50-A2T 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
PackageTape & Reel (TR)
RAM size64K 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)38
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 8x10b
Program memory size256KB (256K x 8)

Product details

The LM3S6918-EQC50-A2T is a 32-bit ARM Cortex-M3 MCU from TI's Stellaris 6000 series, clocked at 50 MHz with 256 KB of Flash and 64 KB of SRAM. Its standout feature is an integrated Ethernet MAC and PHY, making it a single-chip solution for wired connectivity in industrial control, building automation, and IoT gateway designs.

50 MHz Cortex-M3 — enough for a TCP/IP stack

The integrated Ethernet PHY saves a separate transceiver chip and the associated PCB routing — a real BOM and board-area win for space-constrained designs. The 64 KB SRAM is adequate for packet buffers in most industrial Ethernet protocols, though you'll want to budget carefully if you're running a full web server.

Ethernet connectivity — confirmed

Yes, the LM3S6918-EQC50-A2T includes an integrated Ethernet MAC and PHY.

Frequently asked questions

What is the replacement for LM3S6918-EQC50-A2T?

TI has not published a direct pin-compatible replacement for the LM3S6918-EQC50-A2T. For new designs, the TM4C129x series offers Ethernet MAC+PHY on a Cortex-M4F core, but the pinout and peripheral map differ. A full BOM-level redesign is required.

What is the operating voltage range of LM3S6918-EQC50-A2T?

The supply voltage range is 2.25 V to 2.75 V. A regulated 2.5 V rail is required; the part is not 3.3 V tolerant on the core supply.

Does LM3S6918-EQC50-A2T have Ethernet?

Yes, the LM3S6918-EQC50-A2T includes an integrated Ethernet MAC and PHY, along with I²C, SPI, SSI, UART/USART, IrDA, and Microwire interfaces.