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Texas Instruments LM3S628-IQN50-C2 — Microcontrollers & Processors (MCU / MPU / DSP)

Texas Instruments LM3S628-IQN50-C2 ARM Cortex-M3 MCU, 50 MHz

MPNLM3S628-IQN50-C2
Obsolete

Texas Instruments LM3S628-IQN50-C2, Stellaris ARM Cortex-M3S 600 series, 32-bit single-core MCU, 50 MHz, 32 KB Flash, 8 KB RAM, 28 I/O, 48-LQFP (7x7 mm), -40 to 85 °C, 3.0–3.6 V supply, tray.

$5.2877Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM3S628-IQN50-C2 specifications
ParameterValue
SeriesStellaris® ARM® Cortex®-M3S 600
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))3V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed50MHz
PackageTray
RAM size8K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
ConnectivityI²C, Microwire, SPI, SSI, UART/USART
Number of i (O)28
Core processorARM® Cortex®-M3
Case48-LQFP
Data convertersA/D 8x10b
Program memory size32KB (32K x 8)

Product details

Connectivity options cover I²C, SPI, SSI, Microwire, and UART/USART interfaces.

At 50 MHz the Cortex-M3 core delivers roughly 1.25 DMIPS/MHz, or about 62.5 DMIPS. That is enough for moderate control loops, protocol stacks (TCP/IP offload not needed), and real-time sensor fusion. The Flash memory requires zero wait states at this clock speed, so instruction fetch does not stall — a practical advantage over higher-clocked parts that need wait-state insertion.

The Flash can hold a modest application — a bootloader, a few communication stacks (I²C, UART), and application code. The 8 KB RAM (organized as 8K x 8) supports a handful of buffers and a small RTOS heap. If your firmware needs more than 20 KB of code space or 4 KB of runtime data, this part will feel tight; consider a sibling with larger memory.

No last-time-buy window or successor part number is recorded in the official lifecycle data. If you are designing a new product, look at TI's current Cortex-M4 or M0+ families in a 48-LQFP footprint for a pin-compatible path forward.

Package and footprint — 48-LQFP (7x7 mm)

It is a common footprint shared by many Stellaris and later TI ARM MCUs, which simplifies board reuse when migrating. The 28 I/O lines are available on the outer leads; no exposed pad is present, so thermal dissipation relies on the leadframe and board copper.

Frequently asked questions

Is LM3S628-IQN50-C2 obsolete?

Yes, Texas Instruments lists the LM3S628-IQN50-C2 as Obsolete. We can quote current availability against an RFQ.

Does LM3S628-IQN50-C2 have a 10-bit ADC?

Yes, the LM3S628-IQN50-C2 includes an 8-channel 10-bit ADC. This is suitable for reading analog sensors, potentiometers, or low-speed signal acquisition up to the conversion rate supported by the 50 MHz core.

What is the best replacement for LM3S628-IQN50-C2?

No official replacement is listed by Texas Instruments. For a pin-compatible upgrade path, consider TI's current Cortex-M4 or M0+ families in the same 48-LQFP (7x7 mm) footprint — for example, the TM4C123 series offers higher performance and larger memory while maintaining the same package outline. Verify the pinout and peripheral set against your design before committing.