LSM303AGRTR Datasheet, Pinout, Equivalents, and Specs

The LSM303AGRTR is an ultra-low-power, high-performance eCompass module from STMicroelectronics. It integrates a 3D digital linear acceleration sensor and a 3D digital magnetic sensor into a single LGA package. This system-in-package (SiP) provides 6 degrees of freedom (6DoF) sensing, primarily for orientation, tilt-compensated compass, and motion detection applications. Its low power consumption and small footprint make it suitable for battery-operated devices and space-constrained designs.

What is the LSM303AGRTR?

The LSM303AGRTR is a micro-electro-mechanical system (MEMS) device that combines a 3-axis accelerometer and a 3-axis magnetometer on separate silicon dies within one package. The accelerometer measures linear acceleration, while the magnetometer measures magnetic field strength, allowing for the calculation of heading and orientation relative to the Earth's magnetic field. Communication with a host microcontroller is handled via standard I²C or SPI digital interfaces. The device is factory-calibrated and includes embedded features such as a FIFO buffer and programmable interrupts, which offload processing from the host system and enable efficient power management. Its target market includes IoT devices, wearables, drone navigation, and portable consumer electronics requiring precise motion and orientation sensing.

LSM303AGRTR Component Overview

Pinout Configuration and Packaging

The LSM303AGRTR is supplied in a 12-lead Land Grid Array (LGA-12) package with dimensions of 2.0 x 2.0 x 1.0 mm. This small footprint is ideal for high-density PCBs. Key pins include VDD and VDD_IO for power supply, GND, SCL/SPC and SDA/SDI/SDO for the I²C/SPI communication interface, and two dedicated interrupt pins (INT1 and INT2). Due to its compact size, thermal management considerations involve ensuring adequate copper planes connected to the ground pads to dissipate heat, although its ultra-low power consumption minimizes self-heating effects under normal operating conditions.

Core Architectural Features

• Dual-Sensor Architecture: Integrates a 3-axis accelerometer and a 3-axis anisotropic magnetoresistive (AMR) magnetometer in a single package, providing a complete eCompass solution.
• Selectable Full-Scale Ranges: The accelerometer offers user-selectable full scales of ±2g, ±4g, ±8g, and ±16g. The magnetometer features a fixed magnetic full scale of ±50 gauss, providing flexibility for applications with varying dynamic ranges.
• Advanced Power Management: Features multiple operating modes, including low-power and power-down modes for both sensors, enabling significant power savings in battery-powered applications. The typical current consumption is in the microampere range.
• Embedded FIFO Buffer: Includes a 32-level First-In, First-Out (FIFO) buffer that can store sensor data, reducing the host processor's intervention and overall system power consumption by allowing it to remain in a sleep state for longer periods.
• Flexible Digital Interfaces: Supports both I²C fast mode (400 kHz) and SPI (up to 10 MHz) serial interfaces, ensuring broad compatibility with a wide range of microcontrollers and processors.

Specifications Parameter Table

LSM303AGRTR Equivalents, Cross Reference, and Lifecycle

The LSM303AGRTR is currently in "Active" production status by STMicroelectronics. When considering alternatives, it is critical to note that direct pin-to-pin, drop-in replacements for MEMS sensors are uncommon due to unique package layouts and performance characteristics. However, functionally similar components exist. An alternative could be the Bosch Sensortec BMC150, which also integrates a 3-axis accelerometer and a 3-axis magnetometer in a single package, though its pinout and register map differ, requiring hardware and firmware modifications. Another approach is using separate components, such as pairing a standalone accelerometer (e.g., ST's LIS2DH12) with a standalone magnetometer (e.g., AKM's AK09918). This modular approach offers more layout flexibility but increases component count and board space. For buyers facing allocation or long lead times on the LSM303AGRTR, a board redesign is typically necessary to accommodate an alternative part.

Typical Application & Circuit Considerations

The LSM303AGRTR is commonly used in applications requiring orientation awareness, such as tilt-compensated electronic compasses, map rotation in mobile devices, and dead reckoning for indoor navigation. In a typical circuit, it is essential to place decoupling capacitors (e.g., 100nF ceramic) as close as possible to the VDD and VDD_IO pins to ensure a stable power supply. For PCB layout, the sensor should be placed far from sources of magnetic interference, such as motors, speakers, inductors, and high-current power traces, to maintain the accuracy of the magnetometer readings. A ground plane beneath the sensor is recommended to minimize noise coupling. The I²C/SPI communication lines should be routed to avoid crosstalk and maintain signal integrity.

Video Demonstration

Market Availability and Pricing Trends

The supply chain for high-performance MEMS sensors like the LSM303AGRTR can experience fluctuations in lead times due to high demand from the consumer electronics and automotive sectors. Verifying stock with authorized and independent distributors is a standard procurement practice to mitigate potential production delays. To check real-time stock, pricing, or to request a quote for the LSM303AGRTR and its verified alternatives, upload your BOM to WWDParts for fast processing.

Alan Carter

Senior Hardware Engineer & Component Specialist

Alan has over 15 years of expertise in embedded systems design, FPGA architecture, and global semiconductor supply chains. He specializes in component cross-referencing, lifecycle management, and helping OEMs navigate supply shortages.