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Texas Instruments LM3S9781-IBZ80-C3T — Microcontrollers & Processors (MCU / MPU / DSP)

LM3S9781-IBZ80-C3T Stellaris ARM Cortex-M3 MCU, 80 MHz

MPNLM3S9781-IBZ80-C3T
Obsolete

Texas Instruments Stellaris® ARM® Cortex®-M3S 9000 series LM3S9781-IBZ80-C3T, 32-Bit Single-Core MCU, 80MHz, 128KB Flash, 64K x 8 RAM, 65 I/O, CANbus/Ethernet/USB OTG, 108-LFBGA, -40°C~85°C.

Texas Instruments LM3S9781-IBZ80-C3T datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S9781-IBZ80-C3T specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 9000
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.235V ~ 1.365V
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, I²S, POR, PWM, WDT
ConnectivityCANbus, EBI/EMI, Ethernet, I²C, IrDA, LINbus, Microwire, SPI, SSI, UART/USART, USB OTG
Number of i (O)65
Core processorARM® Cortex®-M3
Case108-LFBGA
Data convertersA/D 16x10b
Program memory size128KB (128K x 8)

Product details

The LM3S9781-IBZ80-C3T: With 128 KB of on-chip Flash and 64 KB of SRAM, this MCU fits firmware images for a TCP/IP stack with a small web server, a CANopen node, or a Modbus TCP gateway, but leaves limited headroom for large application logs or over-the-air staging buffers. The 64 KB RAM supports moderate packet buffering for Ethernet frames and CAN message queues without external memory.

108-BGA (10x10) — package and reflow considerations

The 65 general-purpose I/O are distributed across the ball grid — the layout engineer needs the full footprint drawing to route the escape pattern.

Supply rail: 1.235 V to 1.365 V core — a narrow window

The core supply range of 1.235 V to 1.365 V is tight — the power rail needs a regulated LDO or switching regulator with tight tolerance. Brown-out detection and POR are integrated, but the board-level decoupling strategy must follow the recommended layout to keep ripple within this narrow window at 80 MHz operation.

Frequently asked questions

Is LM3S9781-IBZ80-C3T obsolete?

Yes, the LM3S9781-IBZ80-C3T is listed as Obsolete. It is no longer manufactured by Texas Instruments and must be sourced through surplus or broker channels. No official replacement part number has been recorded for this device.

What is the replacement for LM3S9781-IBZ80-C3T?

No official replacement order code is documented in the available lifecycle records. For a pin-compatible migration path within the Stellaris family, you would need to cross-reference the base product number LM3S9781 against TI's current Stellaris or Tiva C Series portfolio, but no direct drop-in successor is confirmed here. The part is sourced as-is through independent distribution for legacy BOM support.