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Texas Instruments LM3S6938-IQC50-A2T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S6938-IQC50-A2T Stellaris ARM Cortex-M3 MCU, 50MHz

MPNLM3S6938-IQC50-A2T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 6000 series, LM3S6938-IQC50-A2T, 32-bit single-core ARM Cortex-M3 at 50MHz, 256KB FLASH, 64KB RAM, 100-LQFP (14x14mm), Ethernet/I2C/SPI/UART, 8x10b ADC, -40°C to 85°C, 2.25V-2.75V.

$37.3664Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S6938-IQC50-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~85°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

What this Cortex-M3 brings to a networked control design

The 8-channel 10-bit ADC and PWM timers cover local analog sensing and motor or valve actuation without an external companion chip.

50 MHz core with 256 KB Flash — memory headroom for protocol stacks

The 50 MHz Cortex-M3 core delivers enough throughput to run a lightweight TCP/IP stack (lwIP or similar) while servicing UART and SPI peripherals without stalling. The 256 KB Flash holds a moderate application plus the Ethernet stack and bootloader; the 64 KB SRAM provides packet buffers and runtime data. Designs that need more heap for large packet queues or multiple protocol instances should budget memory carefully or look at higher-density siblings in the Stellaris 6000 series.

100-LQFP package — layout and assembly notes

No special reflow profile beyond J-STD-020 is needed, but the exposed pad (if present on this variant) should be stitched to ground with thermal vias for adequate heat dissipation. The 38 available GPIOs leave enough pins for a parallel LCD or external memory bus alongside the serial interfaces.

No last-time-buy window remains open through the factory channel. Stock is available only through independent distributors and surplus inventories. No official pin-compatible replacement has been announced by TI; any substitution requires a board redesign and firmware port.

Frequently asked questions

Is LM3S6938-IQC50-A2T obsolete and what is the recommended replacement?

Yes, the LM3S6938-IQC50-A2T is officially obsolete per Texas Instruments. No direct pin-compatible replacement has been announced. A redesign using a current TI Cortex-M4 or TM4C series part, or a comparable MCU from another vendor, would be required to maintain Ethernet and serial connectivity.

Does LM3S6938-IQC50-A2T support Ethernet and what are the communication interfaces?

Yes, it integrates an Ethernet MAC controller. Additional serial interfaces include I²C, IrDA, Microwire, SPI, SSI, and UART/USART, covering most industrial communication needs.