Skip to main content
Log in
Texas Instruments LM3S2739-EQC50-A2 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S2739-EQC50-A2 TI Stellaris ARM Cortex-M3 MCU, 50MHz

MPNLM3S2739-EQC50-A2
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 2000 LM3S2739-EQC50-A2, 32-Bit Single-Core MCU, 50MHz, 128KB (128K x 8) FLASH, 64K x 8 SRAM, 56 I/O, CANbus, I²C, IrDA, Microwire, QEI, SPI, SSI, UART/USART, A/D 4x10b, 2.25V ~ 2.75V, -40°C~105°C, 100-LQFP.

Texas Instruments LM3S2739-EQC50-A2 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S2739-EQC50-A2 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 2000
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 size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, Microwire, QEI, SPI, SSI, UART/USART
Number of i (O)56
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 4x10b
Program memory size128KB (128K x 8)

Product details

The LM3S2739-EQC50-A2: A 3.3 V system needs a regulator (e.g., a 2.5 V LDO) to feed this part, and the regulator's dropout and accuracy must hold the rail inside that window across load steps. The I/O pins are not 5 V tolerant — driving them with 3.3 V logic without level shifting risks exceeding the absolute maximum. For designs already running a 2.5 V digital core, this part drops straight in; for existing 3.3 V boards it adds a regulator and level translators to the BOM.

No current-production successor with the same pinout and peripheral set has been designated — the Stellaris line was migrated to the Tiva C Series, but those devices use a different package and register map. There is no last-time-buy window — the part is already past that stage, so the procurement decision is whether to commit to a broker-sourced lot for the remaining build volume or to begin a redesign.

Peripheral count for system integration

Includes one CAN controller, two I²C modules, two SPI/SSI ports, and up to three UARTs (one with IrDA). QEI handles incremental encoder feedback directly.

Supplied in a 100-pin LQFP (14x14 mm body), surface-mount only.

Frequently asked questions

Is LM3S2739-EQC50-A2 obsolete and what is the replacement?

Yes, this part is officially obsolete. Texas Instruments has not designated a direct pin-compatible or drop-in replacement within the same family. The Stellaris line has been superseded by the Tiva C Series, but those MCUs use a different package and register map, requiring a firmware and PCB redesign. For existing BOMs, the only sourcing path is the surplus market.

Can LM3S2739-EQC50-A2 be used with 3.3V logic?

Not directly. Interfacing with 3.3 V logic requires a level shifter or an LDO to drop the rail to 2.5 V. The I/O thresholds scale with VDD, so a 2.5 V supply means the input high threshold is around 1.75 V — which is still compatible with 3.3 V CMOS outputs if the source can drive the lower rail.

Does LM3S2739-EQC50-A2 have CAN bus and how many UARTs?

Yes, it includes one CAN 2.0 controller. The connectivity block also provides up to three UARTs (one with IrDA support), two I²C modules, two SPI/SSI ports, and a quadrature encoder interface (QEI).

Where can I buy LM3S2739-EQC50-A2?

Since the part is obsolete, stock is limited to existing inventory lots and new-old-stock holdings.