Texas Instruments LM3S300-IQN25-C2T

Overview

LM3S300-IQN25-C2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, and integrated peripherals including UART, I²C, SSI, GPIO, timers, watchdog, and analog comparators; operates at up to 50 MHz and targets industrial control, motor drive, and embedded automation systems.

For engineers reviewing the LM3S300-IQN25-C2T datasheet, LM3S300-IQN25-C2T pinout, LM3S300-IQN25-C2T application, or LM3S300-IQN25-C2T equivalent, key selection criteria include flash/SRAM capacity, Cortex-M3 core integration, peripheral mix (UART/I²C/SSI), operating voltage range (2.25–3.63 V), and QFP-100 package compatibility for space-constrained industrial PCBs.

Technical Context

The LM3S300-IQN25-C2T implements the ARMv7-M architecture with Thumb-2 instruction set, nested vectored interrupt controller (NVIC), SysTick timer, and memory protection unit (MPU); it supports sleep modes (sleep/deep-sleep) with wake-up via GPIO, timer, or peripheral interrupts.

Its system-level interface includes JTAG debugging, serial flash loader over UART/SSI, and on-chip LDO regulator delivering 1.8 V core voltage from 2.25–3.63 V supply; clock tree supports PLL-based 50 MHz system clock derived from internal oscillator or external crystal.

Key Specifications

Pinout & Package

LM3S300-IQN25-C2T is housed in a 100-pin LQFP (Low-Profile Quad Flat Package) with exposed thermal pad, compatible with standard reflow profiles and manual soldering processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3S310-IQN25-C2T, the LM3S300-IQN25-C2T omits USB hardware-reducing silicon area, power consumption, and layout complexity. Against TM4C123GH6PM, it offers lower clock speed and no FPU/CAN but maintains identical footprint and software compatibility for basic control tasks, easing migration where feature expansion isn't required.

Availability

LM3S300-IQN25-C2T is available at Aetrix Electronics and suitable for industrial motor control, embedded HMI panels, smart sensor nodes, and power supply monitors requiring stable component supply and long-term lifecycle support.

Supply support for LM3S300-IQN25-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial and automotive-grade microcontrollers.

The Stellaris LM3S series was designed specifically for cost-sensitive, real-time industrial control applications requiring robust peripheral integration, deterministic interrupt response, and simplified power architecture-without external memory or complex clock trees.

FAQ

What is the maximum operating frequency of the LM3S300-IQN25-C2T?

The LM3S300-IQN25-C2T operates at a maximum system clock frequency of 50 MHz, achieved via its integrated PLL that multiplies the input clock (from internal oscillator or external crystal). This frequency is fully supported across the entire industrial temperature range (–40°C to +85°C) and all specified supply voltages (2.25–3.63 V), enabling deterministic real-time execution for time-critical control loops.

Does the LM3S300-IQN25-C2T include an internal voltage regulator?

Yes, the LM3S300-IQN25-C2T integrates a low-dropout (LDO) regulator that converts the 2.25–3.63 V supply into a stable 1.8 V core voltage. This eliminates the need for an external 1.8 V regulator, reduces board space, and ensures consistent core performance across input voltage variation-critical for industrial environments with fluctuating power rails.

How many UART interfaces does the LM3S300-IQN25-C2T support?

The LM3S300-IQN25-C2T supports two independent UART modules (UART0 and UART1), each with 16-byte FIFOs, programmable baud rates, and full modem control signals. These UARTs can be mapped to multiple GPIO pins via peripheral multiplexing, allowing flexible routing for RS-232, RS-485, or TTL-level serial communication in industrial subsystems.

Can the LM3S300-IQN25-C2T operate in low-power modes?

Yes, the LM3S300-IQN25-C2T supports Sleep and Deep-Sleep modes with typical current consumption of 12 µA in Deep-Sleep at 3 V. Wake-up sources include GPIO edges, timer timeouts, UART receive events, and analog comparator outputs-enabling energy-efficient operation in battery-powered sensor nodes or standby monitoring applications without external wake controllers.

What package type is used for the LM3S300-IQN25-C2T?

The LM3S300-IQN25-C2T is packaged in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad. This RoHS-compliant package supports standard reflow soldering, provides adequate thermal dissipation for continuous 50 MHz operation, and maintains pin compatibility with other LM3S3xx variants-facilitating design reuse and layout scalability.