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Texas Instruments LM3S3651-IQR50-A0 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S3651-IQR50-A0 Stellaris ARM Cortex-M3 MCU, 50MHz

MPNLM3S3651-IQR50-A0
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 3000 series LM3S3651-IQR50-A0, 32-Bit Single-Core MCU, 50MHz, 128KB Flash, 32K x 8 RAM, USB OTG, 64-LQFP, -40°C to 85°C.

$11.4417Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S3651-IQR50-A0 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 3000
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, DMA, POR, PWM, WDT
ConnectivityI²C, IrDA, Microwire, SPI, SSI, UART/USART, USB OTG
Number of i (O)33
Core processorARM® Cortex®-M3
Case64-LQFP
Data convertersA/D 4x10b
Program memory size128KB (128K x 8)

Product details

128 KB Flash, 32K x 8 RAM — memory budget for firmware

The LM3S3651-IQR50-A0: The 128 KB Flash (128K x 8) and 32K x 8 SRAM place this MCU in the mid-range of the Stellaris family. The Flash suits a single firmware image with room for a modest bootloader; the SRAM handles a couple of USB buffers plus a real-time control loop's data structures.

The LM3S3651-IQR50-A0 lifecycle status is Obsolete. For existing BOM lines, procurement must source through independent distribution or the surplus channel.

Peripheral set — USB OTG plus legacy serial

The connectivity block includes I²C, SPI, SSI, Microwire, UART/USART, IrDA, and USB OTG — one of the few Stellaris parts with both USB host/device capability and a full set of legacy serial buses. Brown-out detect, POR, PWM, and WDT are on-chip for supervision and motor-control PWM generation.

Frequently asked questions

What is the replacement for LM3S3651-IQR50-A0?

No official replacement order code is recorded for this part. For a pin-compatible alternative, look at other Stellaris LM3S parts in the 64-LQFP package with USB OTG — but verify the peripheral set and memory sizing against your firmware image, as the family has density and feature variations.