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Texas Instruments LM3S6633-IBZ50-A2 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S6633-IBZ50-A2 Stellaris ARM Cortex-M3 MCU, 50 MHz, 128 KB Flash

MPNLM3S6633-IBZ50-A2
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 6000 series, LM3S6633-IBZ50-A2, 32-bit single-core MCU, 50 MHz, 128 KB Flash, 32K x 8 RAM, Ethernet, I²C, SPI, UART, 108-LFBGA, -40°C to 85°C.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S6633-IBZ50-A2 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
PackageTray
RAM size32K 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)41
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 3x10b
Program memory size128KB (128K x 8)

Product details

The Texas Instruments LM3S6633-IBZ50-A2 is a 32-bit ARM Cortex-M3 MCU from the Stellaris 6000 series, clocked at 50 MHz with 128 KB of Flash and 32 KB of RAM. The part is built for industrial control, building automation, and networked sensor nodes that need a single-chip Ethernet gateway — the integrated MAC/PHY saves an external transceiver on the BOM. Operating from 2.25 V to 2.75 V over -40°C to 85°C, it fits factory-floor and outdoor telecom enclosures where extended temperature is mandatory.

The 50 MHz Cortex-M3 core runs a lightweight TCP/IP stack and handles Modbus TCP or Ethernet/IP polling without a separate communications processor.

Frequently asked questions

Is LM3S6633-IBZ50-A2 obsolete or still active?

The LM3S6633-IBZ50-A2 is obsolete. It is no longer in production and must be sourced through surplus or broker channels.

What is the replacement for LM3S6633-IBZ50-A2?

TI does not list a direct pin-compatible replacement for this Stellaris part. A migration to a current-generation Cortex-M4 or M7 MCU with Ethernet (e.g., TM4C or MSP432E series) requires a hardware and software redesign.

Where can I buy LM3S6633-IBZ50-A2 available via RFQ confirmation?

This obsolete part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm position.

What is LM3S6633-IBZ50-A2's listed speed?

The core runs at 50 MHz, which is the maximum clock for the Cortex-M3 in this device.

Does LM3S6633-IBZ50-A2 have Ethernet?

Yes, the MCU integrates an Ethernet MAC and PHY, along with I²C, SPI, SSI, UART, IrDA, and Microwire serial interfaces.