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Texas Instruments LM3S1958-EQC50-A2T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S1958-EQC50-A2T Stellaris ARM Cortex-M3 MCU, 50 MHz

MPNLM3S1958-EQC50-A2T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 1000 series MCU, LM3S1958-EQC50-A2T, 32-Bit Single-Core ARM Cortex-M3 at 50MHz, 256KB Flash, 64K x 8 RAM, 52 I/O, 8x10b ADC, 2.25V–2.75V, -40°C~105°C, 100-LQFP, Tape & Reel.

Texas Instruments LM3S1958-EQC50-A2T datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S1958-EQC50-A2T 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
PackageTape & Reel (TR)
RAM size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
ConnectivityI²C, IrDA, Microwire, SPI, SSI, UART/USART
Number of i (O)52
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 8x10b
Program memory size256KB (256K x 8)

Product details

No last-time-buy window remains open through the factory channel.

Core specs that define the fit

The 8-channel 10-bit ADC covers basic analog sensing — think potentiometer feedback, thermistor inputs, or current-shunt monitoring on a motor-drive board. The internal oscillator and the brown-out detect/POR/PWM/WDT peripheral set let it run with minimal external support components.

Package — the footprint constraint for any substitute

Housed in a 100-LQFP with a 14x14 mm body. Any pin-compatible replacement must match this mechanical footprint exactly.

Frequently asked questions

Is the LM3S1958-EQC50-A2T obsolete or EOL?

Yes, it is officially Obsolete per the lifecycle record. Texas Instruments has ended production with no last-time-buy window remaining. Sourcing is limited to the independent surplus and broker channel.

What is the replacement for LM3S1958-EQC50-A2T?

A replacement search should target a 32-bit ARM Cortex-M3 or Cortex-M4 MCU in a 100-LQFP 14x14 mm package, with 50 MHz or higher core speed, 256 KB+ Flash, 64 KB+ RAM, 52+ I/O, and a 2.5 V supply rail — or a design change to a 3.3 V part with an LDO. The peripheral set (I²C, SPI, UART, 8x10b ADC) is common enough that several current-production MCU families can cover it, but the 2.25 V–2.75 V supply is the unusual constraint that may force a rail change.