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Texas Instruments LM3S5P3B-IQC80-C5 — Microcontrollers & Processors (MCU / MPU / DSP)

Texas Instruments LM3S5P3B-IQC80-C5 ARM Cortex-M3 MCU, 80 MHz

MPNLM3S5P3B-IQC80-C5
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series, LM3S5P3B-IQC80-C5, 32-bit single-core MCU, 80 MHz, 64 KB Flash, 24 KB RAM, 67 I/O, USB/CAN/I²C/SPI/UART/LIN, 100-LQFP 14×14 mm, -40°C to 85°C, 1.08 V–1.32 V VCC.

Texas Instruments LM3S5P3B-IQC80-C5 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S5P3B-IQC80-C5 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 5000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.08V ~ 1.32V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTray
RAM size24K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB
Number of i (O)67
Core processorARM® Cortex®-M3
Case100-LQFP
Data convertersA/D 16x10b
Program memory size64KB (64K x 8)

Product details

The LM3S5P3B-IQC80-C5 is a 32-bit ARM Cortex-M3 MCU from the Stellaris 5000 series, clocked at 80 MHz with 64 KB Flash and 24 KB RAM.

80 MHz on a Cortex-M3 gives you about 80 DMIPS throughput — enough for real-time control loops, protocol stacks (USB, CAN), and moderate data processing without an external memory bus. The 24 KB RAM handles a few KB of stack and buffers; the 64 KB Flash holds a firmware image with a USB stack and application code. If your design needs more headroom for heavy DSP or large lookup tables, you would step up to a higher-density Stellaris variant or a Cortex-M4 part.

Supply voltage is 1.08 V to 1.32 V core.

Frequently asked questions

Where can I buy LM3S5P3B-IQC80-C5 and get a price?

This obsolete part is sourced through independent distribution. Submit an RFQ for current availability and pricing — stock and lead time are confirmed at quote time.

What is the closest pin-compatible alternative to LM3S5P3B-IQC80-C5?

Within the Stellaris 5000 series, several 100-LQFP variants share the same pinout. Check the LM3S5xxx cross-reference for a part with matching Flash/RAM and peripheral set — the exact replacement depends on your required memory and interface configuration.

What is the LM3S5P3B-IQC80-C5's core speed?

The core runs at 80 MHz, delivering roughly 80 DMIPS on the ARM Cortex-M3 pipeline.