Skip to main content
Log in
Texas Instruments LM3S1R21-IBZ80-C3 — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S1R21-IBZ80-C3 ARM Cortex-M3 MCU, 80 MHz, 256 KB Flash

MPNLM3S1R21-IBZ80-C3
Obsolete

Stellaris® ARM® Cortex®-M3S 1000 series LM3S1R21-IBZ80-C3, 32-Bit Single-Core MCU, 80MHz, 256KB Flash, 48K x 8 RAM, 108-LFBGA, -40°C~85°C.

Texas Instruments LM3S1R21-IBZ80-C3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S1R21-IBZ80-C3 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 1000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.08V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTray
RAM size48K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityEBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, UART/USART
Number of i (O)67
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 8x10b
Program memory size256KB (256K x 8)

Product details

80 MHz Cortex-M3 — processing headroom for control loops

The LM3S1R21-IBZ80-C3: The ARM Cortex-M3 core at 80 MHz delivers enough throughput for single-loop motor control, sensor fusion, or protocol bridging without external DSP. The 256 KB Flash can hold a full application stack including a real-time OS, while the 48 KB SRAM supports moderate data buffers for communication or logging.

There is no direct replacement recorded in the official lifecycle data, so buyers needing this exact BGA footprint and pinout must source through independent distribution or surplus channels. For new designs, consider evaluating a current-production ARM Cortex-M3 or Cortex-M4 MCU with similar peripheral and memory sizing, though a pin-compatible drop-in is not documented.

108-ball BGA — layout and rework notes

The BGA footprint is compact, but the dense ball array means fan-out vias must be planned early in the PCB layout.

Frequently asked questions

Where can I buy LM3S1R21-IBZ80-C3?

The LM3S1R21-IBZ80-C3 is obsolete and sourced through independent distribution. Submit an RFQ for current availability and pricing — quotes are confirmed at order time.

Is LM3S1R21-IBZ80-C3 obsolete?

Yes, the LM3S1R21-IBZ80-C3 is listed as obsolete. No official direct replacement is recorded in the lifecycle data.

Does LM3S1R21-IBZ80-C3 have USB connectivity?

The LM3S1R21-IBZ80-C3 does not list USB in its connectivity set. The available interfaces are EBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, and UART/USART.

What is the cross reference for LM3S1R21-IBZ80-C3?

No official cross reference or pin-compatible second source is recorded for this part. Buyers needing a replacement should evaluate current-production ARM Cortex-M3 or Cortex-M4 MCUs with similar memory and peripheral configurations, but a direct drop-in is not documented.