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Texas Instruments LM3S1958-EQC50-A2 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S1958-EQC50-A2 Stellaris ARM Cortex-M3 MCU, 50MHz

MPNLM3S1958-EQC50-A2
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 1000 series, LM3S1958-EQC50-A2, 32-Bit Single-Core MCU, 50MHz, 256KB Flash, 64K x 8 RAM, 52 I/O, 100-LQFP, -40°C~105°C.

Texas Instruments LM3S1958-EQC50-A2 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S1958-EQC50-A2 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
PackageTray
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

The LM3S1958-EQC50-A2 is obsolete per the manufacturer.

The 50 MHz ARM Cortex-M3 core delivers the throughput for a Modbus TCP gateway or multi-loop PID controller. Any pin-compatible replacement must match this speed.

256 KB Flash / 64 KB RAM — firmware and buffer sizing

The 256 KB Flash and 64 KB RAM support a bootloader, TCP/IP stack, and application pages. A replacement must match these memory sizes to avoid breaking the binary.

Rated -40 to 105 °C, the LM3S1958-EQC50-A2 is specified for motor-drive cabinets and outdoor telecom shelters. The 100-LQFP (14x14 mm) footprint with 52 I/O is the mechanical anchor for any replacement layout.

Connectivity covers I²C, SPI, SSI, Microwire, UART/USART, and IrDA, plus an 8-channel 10-bit ADC.

Frequently asked questions

Is LM3S1958-EQC50-A2 obsolete?

Yes, the LM3S1958-EQC50-A2 is obsolete. No last-time-buy window remains; all sourcing is through independent distribution. Availability and pricing are confirmed at quote time against an RFQ.

What is the replacement for LM3S1958-EQC50-A2?

The manufacturer has not published a direct pin-compatible successor for the LM3S1958-EQC50-A2. A functionally equivalent replacement within the Stellaris family would need to match the 50 MHz Cortex-M3 core, 256 KB Flash, 64 KB RAM, 100-LQFP package, and 2.25 V to 2.75 V supply range. Without an official cross-reference, a board-level redesign using a current-production Cortex-M3 or Cortex-M4 part is the practical path.

What are the specifications of LM3S1958-EQC50-A2?

The LM3S1958-EQC50-A2 is a 32-bit ARM Cortex-M3 MCU running at 50 MHz, with 256 KB Flash, 64 KB RAM, 52 I/O, an 8-channel 10-bit ADC, and connectivity including I²C, SPI, UART, and IrDA. It operates from 2.25 V to 2.75 V over -40 to 105 °C in a 100-LQFP package.