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Texas Instruments LM3S5C36-IQR80-A1T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S5C36-IQR80-A1T ARM Cortex-M3 MCU, 80 MHz, 512 KB Flash

MPNLM3S5C36-IQR80-A1T
Obsolete

Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5C36-IQR80-A1T, 32-bit MCU, 80 MHz, 512 KB Flash, 64 KB RAM, CAN, USB, I2C, SPI, UART, 8x12-bit ADC, 64-LQFP, -40 to 85°C.

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

Specifications

LM3S5C36-IQR80-A1T specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 5000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))3V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed80MHz
PackageTape & Reel (TR)
RAM size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB
Number of i (O)33
Core processorARM® Cortex®-M3
Case64-LQFP
Data convertersA/D 8x12b
Program memory size512KB (512K x 8)

Product details

This part is officially obsolete (EOL). No further factory orders are possible, and the last-time-buy window has closed. If you have an active BOM line that calls out LM3S5C36-IQR80-A1T, the only sourcing path is the independent surplus and broker channel — which is exactly what we cover. Do not assume you can still buy it through standard distribution — you cannot.

80 MHz on a single-cycle Cortex-M3 delivers roughly 80 DMIPS. That is enough for a field-oriented motor control loop with CANopen stack and headroom for a Modbus RTU slave.

512 KB Flash / 64 KB RAM — sizing the firmware

512 KB of Flash holds a full application with a real-time OS, a CANopen or USB stack, and a bootloader for field updates. The 64 KB SRAM is tight for large data buffers.

The -40 to 85°C rating suits factory-floor, outdoor telecom, and engine-bay-adjacent enclosures. The 64-LQFP (10x10 mm) is a common footprint.

Frequently asked questions

Is LM3S5C36-IQR80-A1T obsolete?

Yes, the LM3S5C36-IQR80-A1T is officially obsolete (EOL). No further factory orders are accepted. It is available only through independent surplus and broker channels.

What is the replacement for LM3S5C36-IQR80-A1T?

There is no official direct-replacement part listed for the LM3S5C36-IQR80-A1T. The Stellaris family has been discontinued by Texas Instruments. A pin-compatible replacement would need to match the 64-LQFP footprint, 80 MHz Cortex-M3 core, 512 KB Flash, and peripheral set including CAN and USB — but no single part is documented as a drop-in. A design review is required.

What are the specifications of LM3S5C36-IQR80-A1T?

The LM3S5C36-IQR80-A1T is a 32-bit ARM Cortex-M3 MCU running at 80 MHz, with 512 KB Flash, 64 KB RAM, 33 I/O lines, an 8-channel 12-bit ADC, and connectivity including CAN, USB, I2C, SPI, SSI, UART, and IrDA. It comes in a 64-LQFP package and is rated for -40 to 85°C operation.

Does LM3S5C36-IQR80-A1T have USB?

Yes, the LM3S5C36-IQR80-A1T includes USB connectivity as part of its peripheral set.

What package is LM3S5C36-IQR80-A1T?

The LM3S5C36-IQR80-A1T is packaged in a 64-LQFP (10x10 mm) surface-mount package.