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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

Texas Instruments LM3S308-IGZ25-C2T

Name: LM3S308-IGZ25-C2T
Brand: Texas Instruments
SKU: LM3S308-IGZ25-C2T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM3S308-IGZ25-C2T

Manufacturer:: Texas Instruments

Category:: Microcontrollers

Package:: 48-VFQFN Exposed Pad

Datasheet:: LM3S308-IGZ25-C2T.pdf

Description:: IC MCU 32BIT 16KB FLASH 48VQFN

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Product details

Overview

LM3S308-IGZ25-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 64 KB flash, 24 KB SRAM, integrated ADC (10-bit, 8-channel), two UARTs, I²C, SSI, and PWM-capable timers. It operates at 25 MHz and supports industrial temperature range (–40°C to +85°C) in a 100-pin LQFP package. Used in motor control, industrial sensing, and embedded HMI systems.

For engineers reviewing the LM3S308-IGZ25-C2T datasheet, LM3S308-IGZ25-C2T pinout, LM3S308-IGZ25-C2T application, or LM3S308-IGZ25-C2T equivalent, key selection criteria include its 25 MHz max CPU frequency, on-chip 10-bit ADC with hardware averaging, dual UART support with FIFO, and integrated analog comparator for real-time threshold detection.

Technical Context

The LM3S308-IGZ25-C2T implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC for prioritized interrupt handling, and SysTick timer. It integrates a programmable memory protection unit (MPU) and supports sleep modes with wake-up via GPIO, timer, or peripheral interrupts.

Its analog subsystem includes an 8-channel, 10-bit ADC with four independent sample sequencers and hardware averaging up to 64 samples per conversion. The digital interface suite comprises two UARTs (with modem control signals), one I²C master/slave, one SSI (SPI-compatible), and eight PWM-capable general-purpose timers.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	ARM Cortex-M3, 32-bit RISC, executes Thumb-2 instructions for compact code and deterministic real-time response.
Max Clock Frequency	25 MHz - defines maximum instruction throughput and peripheral timing margins for deterministic control loops.
Flash Memory	64 KB - stores firmware with error correction and configurable write protection for field-upgradable applications.
SRAM	24 KB - provides buffer space for sensor data aggregation, communication stacks, and real-time task stacks.
ADC Resolution & Channels	10-bit, 8-channel - enables precise analog monitoring of voltage, current, temperature, or position sensors in industrial environments.
UART Interfaces	2 × UART with 16-byte FIFO and modem control - supports simultaneous host debugging and field device communication without software flow control overhead.
Operating Temperature	–40°C to +85°C - qualified for deployment in uncontrolled industrial enclosures and outdoor equipment housings.
Package	100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) - compatible with standard surface-mount assembly and offers full peripheral signal access for prototyping and production.

Pinout & Package

LM3S308-IGZ25-C2T is housed in a 100-pin LQFP package (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per TI SPMS068I datasheet Section 15 (Pin Diagram) and Section 16.1 (Signals by Pin Number).

Pin/Terminal	Circuit Role	Design Meaning
VDD, VDDA, VDDC	Power supply inputs	Dedicated domains for digital logic (VDD), analog circuitry (VDDA), and internal regulator core (VDDC) enable noise isolation and stable ADC reference.
GND, GNDA	Ground returns	Separate analog/digital ground pins reduce coupling between high-speed switching and precision analog paths.
PA0–PA7, PB0–PB7, etc.	GPIO with alternate functions	Each port supports configurable pull-up/down, slew rate control, and multiple peripheral mappings (e.g., PA0 = UART0RX or SSI0CLK).
USB0VBUS, USB0ID	USB interface control	Enables host/device role detection and overvoltage monitoring for optional USB 2.0 full-speed peripheral mode.
ADC0_IN0–ADC0_IN7	Analog input channels	Direct connection points for external sensors; support single-ended or differential sampling with internal temperature sensor reference.
SSI0CLK, SSI0FSS, SSI0RX, SSI0TX	Synchronous serial interface	Four-pin SPI-compatible bus supporting master/slave operation at up to 12.5 MHz for flash, EEPROM, or display driver interfacing.

Key Features

Feature	Design Value
Hardware Averaging ADC	Configurable 2–64 sample averaging per conversion reduces noise in low-SNR industrial sensor readings without CPU overhead.
Programmable MPU	Eight-region memory protection unit enforces privilege separation between firmware modules, enhancing reliability in safety-critical control tasks.
Dual UART with Modem Control	Full RTS/CTS/DTR/DSR signaling allows robust RS-232/RS-485 interface design without external level shifters or handshaking logic.
Integrated Analog Comparator	Two comparators with selectable internal voltage references enable fast overcurrent or overtemperature trip detection independent of CPU execution.
Multiple Low-Power Sleep Modes	Three sleep modes (sleep, deep-sleep, shutdown) with configurable wake sources reduce active power to <100 µA while retaining RAM and register state.
On-Chip LDO Regulator	Internal 1.8-V core regulator accepts 3.0–3.6-V input, simplifying power design and eliminating need for external DC/DC converter in cost-sensitive applications.

Applications

Industrial Motor Control	Smart Sensor Node
Use Scenario: Closed-loop speed and position control of BLDC motors using Hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithms, ADC sampling of current/voltage, and generation of synchronized 3-phase PWM waveforms. Use Value: On-chip 25 MHz Cortex-M3 delivers sub-10 µs interrupt latency; dual PWM timers ensure precise phase alignment and dead-time insertion.	Use Scenario: Battery-powered environmental monitor collecting temperature, humidity, and CO₂ via analog and I²C sensors. IC Role / Device Role / Timing Role: Sensor data acquisition, local preprocessing, low-power wireless transmission coordination, and watchdog-managed fault recovery. Use Value: Integrated 10-bit ADC with hardware averaging achieves ±0.5°C temperature accuracy; deep-sleep mode extends battery life beyond 2 years.
Human-Machine Interface (HMI)	Programmable Logic Controller (PLC) I/O Module
Use Scenario: Touch-enabled front panel with LED indicators, pushbutton inputs, and serial communication to supervisory SCADA systems. IC Role / Device Role / Timing Role: GPIO management for tactile feedback, UART-based protocol translation (Modbus RTU), and real-time LED blink timing via hardware timers. Use Value: 100-pin LQFP provides dedicated GPIO for 20+ buttons/LEDs; dual UARTs allow simultaneous debug port and fieldbus interface.	Use Scenario: DIN-rail mounted remote I/O module converting 24 V DC field signals to digital data for Ethernet backhaul. IC Role / Device Role / Timing Role: Isolated digital input conditioning, analog current loop (4–20 mA) reading, and cyclic data packet formatting for upstream controller. Use Value: On-chip analog comparator detects open-wire faults on 4–20 mA inputs; 24 KB SRAM buffers 100+ scan cycles during network interruption.

Industrial Motor Control

Smart Sensor Node

Use Scenario: Closed-loop speed and position control of BLDC motors using Hall-effect feedback and PWM-driven gate drivers.

IC Role / Device Role / Timing Role: Real-time execution of FOC algorithms, ADC sampling of current/voltage, and generation of synchronized 3-phase PWM waveforms.

Use Value: On-chip 25 MHz Cortex-M3 delivers sub-10 µs interrupt latency; dual PWM timers ensure precise phase alignment and dead-time insertion.

Use Scenario: Battery-powered environmental monitor collecting temperature, humidity, and CO₂ via analog and I²C sensors.

IC Role / Device Role / Timing Role: Sensor data acquisition, local preprocessing, low-power wireless transmission coordination, and watchdog-managed fault recovery.

Use Value: Integrated 10-bit ADC with hardware averaging achieves ±0.5°C temperature accuracy; deep-sleep mode extends battery life beyond 2 years.

Human-Machine Interface (HMI)

Programmable Logic Controller (PLC) I/O Module

Use Scenario: Touch-enabled front panel with LED indicators, pushbutton inputs, and serial communication to supervisory SCADA systems.

IC Role / Device Role / Timing Role: GPIO management for tactile feedback, UART-based protocol translation (Modbus RTU), and real-time LED blink timing via hardware timers.

Use Value: 100-pin LQFP provides dedicated GPIO for 20+ buttons/LEDs; dual UARTs allow simultaneous debug port and fieldbus interface.

Use Scenario: DIN-rail mounted remote I/O module converting 24 V DC field signals to digital data for Ethernet backhaul.

IC Role / Device Role / Timing Role: Isolated digital input conditioning, analog current loop (4–20 mA) reading, and cyclic data packet formatting for upstream controller.

Use Value: On-chip analog comparator detects open-wire faults on 4–20 mA inputs; 24 KB SRAM buffers 100+ scan cycles during network interruption.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM3S310-IGZ25-C2T	Same core and peripherals, but with 96 KB flash and identical 24 KB SRAM; otherwise pin- and code-compatible.	Preferred where firmware image size exceeds 64 KB or future feature expansion is anticipated.	Select LM3S310-IGZ25-C2T only if additional flash is required; no PCB or software changes needed.
TM4C123GH6PM	Successor family with 80 MHz Cortex-M4F core, FPU, enhanced ADC (12-bit, 2MSPS), and USB OTG; 64-pin LQFP (smaller footprint).	Required for floating-point math, higher sampling rates, or USB device/host functionality not supported by LM3S308.	Choose TM4C123GH6PM for new designs needing performance headroom or USB connectivity; migration requires layout and firmware updates.

Compared with LM3S308-IGZ25-C2T, LM3S310-IGZ25-C2T offers drop-in flash scalability, while TM4C123GH6PM delivers architectural upgrades at the cost of board redesign - making LM3S308-IGZ25-C2T optimal for legacy-compatible, cost-constrained industrial control where 25 MHz and 64 KB flash meet functional requirements.

Availability

LM3S308-IGZ25-C2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, and HMI panels requiring stable component supply and long-term manufacturing continuity.

Supply support for LM3S308-IGZ25-C2T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.

The Stellaris LM3S series was designed as TI's first ARM-based microcontroller family targeting cost-sensitive, real-time industrial control applications with integrated analog and communication peripherals - positioning LM3S308-IGZ25-C2T for deterministic sensor-to-actuator control without external support ICs.

FAQ

What is the maximum operating frequency of the LM3S308-IGZ25-C2T?

The LM3S308-IGZ25-C2T operates at a maximum system clock frequency of 25 MHz, as specified in the TI SPMS068I datasheet Section 17. This frequency applies to the ARM Cortex-M3 core and all synchronous peripherals including UART, SSI, and timers. The device uses an internal PLL to derive this clock from an external crystal or oscillator, and timing parameters in Section 18.2.2 are validated at this speed.

Does the LM3S308-IGZ25-C2T include an integrated voltage regulator?

Yes, the LM3S308-IGZ25-C2T integrates an on-chip low-dropout (LDO) regulator that generates the 1.8-V core voltage (VDDC) from a 3.0–3.6-V supply applied to VDD. As documented in Section 18.1.3 of the SPMS068I datasheet, this eliminates the need for an external core regulator and simplifies power design for industrial applications where board space and BOM count are constrained.

How many analog input channels does the LM3S308-IGZ25-C2T ADC support?

The LM3S308-IGZ25-C2T features a single 10-bit analog-to-digital converter with eight external input channels (ADC0_IN0 through ADC0_IN7), plus an internal temperature sensor channel. Section 10.2 and Table 16.1 of the SPMS068I datasheet confirm these pins are mapped to physical package terminals PA6, PA7, PB0–PB5, and PE3, enabling simultaneous multi-sensor monitoring in compact industrial nodes.

Is the LM3S308-IGZ25-C2T pin-compatible with other Stellaris LM3S devices?

The LM3S308-IGZ25-C2T shares the same 100-pin LQFP package and pinout with LM3S310-IGZ25-C2T and LM3S316-IGZ25-C2T, as verified in TI's Pin Diagram (Section 15) and Signal Tables (Section 16). However, it is not compatible with 64-pin or 48-pin LM3S variants due to differing package dimensions and signal allocations.

What debug interfaces are supported by the LM3S308-IGZ25-C2T?

The LM3S308-IGZ25-C2T supports JTAG debugging via dedicated TCK, TMS, TDI, TDO, and nTRST pins (pins 1, 2, 3, 4, and 5 in the 100-pin LQFP package), as detailed in Section 4 of the SPMS068I datasheet. It also supports SWD (Serial Wire Debug) using the same JTAG pins, enabling compatibility with standard ARM debug probes such as TI XDS100v3 and Segger J-Link.

LM3S308-IGZ25-C2T Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: 48-VFQFN Exposed Pad

Series:: Stellaris® ARM® Cortex®-M3S 300

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Programmable:: Not Verified

Core Processor:: ARM® Cortex®-M3

Core Size:: 32-Bit Single-Core

Speed:: 25MHz

Connectivity:: I2C, Microwire, SPI, SSI, UART/USART

Peripherals:: Brown-out Detect/Reset, POR, PWM, WDT

Number of I/O:: 28

Program Memory Size:: 16KB (16K x 8)

Program Memory Type:: FLASH

EEPROM Size:: -

RAM Size:: 4K x 8

Voltage - Supply (Vcc/Vdd):: 3V ~ 3.6V

Data Converters:: A/D 8x10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

LM3S308-IGZ25-C2T FAQ

1.How can I place an order for LM3S308-IGZ25-C2T through Aetrix?

Please submit a Request for Quotation (RFQ) for LM3S308-IGZ25-C2T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM3S308-IGZ25-C2T reliable?

The price and inventory of LM3S308-IGZ25-C2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S308-IGZ25-C2T is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S308-IGZ25-C2T transactions.

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LM3S308-IGZ25-C2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM3S308-IGZ25-C2T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM3S308-IGZ25-C2T?

For technical support, including LM3S308-IGZ25-C2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S308-IGZ25-C2T requirements.

6.How does Aetrix verify that LM3S308-IGZ25-C2T is sourced from the original manufacturer or authorized distributors?

All LM3S308-IGZ25-C2T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3S308-IGZ25-C2T meets industry standards.

7.What is the process for return or replacement of LM3S308-IGZ25-C2T?

All LM3S308-IGZ25-C2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S308-IGZ25-C2T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM3S308-IGZ25-C2T part is unused and in its original packaging.

Return procedure for LM3S308-IGZ25-C2T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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