STMicroelectronics A3G4250DTR

Overview

A3G4250DTR from STMicroelectronics is a low-power, 3-axis digital output MEMS gyroscope with ±245 dps full-scale range, 16-bit angular rate resolution, integrated FIFO and temperature sensor, operating from 2.4 V to 3.6 V supply and supporting both I²C and SPI interfaces - used in automotive in-dash navigation and telematics motion sensing.

For engineers reviewing the A3G4250DTR datasheet, A3G4250DTR pinout, A3G4250DTR application, or A3G4250DTR equivalent, key selection criteria include its dual-interface flexibility, embedded high/low-pass filter configurability, -40 °C to +85 °C operation, LGA-16 package footprint, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The A3G4250DTR integrates a micromachined silicon sensing element with a CMOS interface IC, delivering angular rate data via configurable digital outputs. Its architecture includes dedicated PLL-based signal conditioning, programmable digital filtering (user-selectable bandwidth), and on-chip FIFO supporting bypass/stream/FIFO modes.

It features two interrupt lines (INT1 and DRDY/INT2), supports 1.8 V IO compatibility, and embeds self-test capability, power-down/sleep modes, and an 8-bit temperature sensor - all calibrated and trimmed during manufacturing to match sensor characteristics.

Key Specifications

Pinout & Package

The A3G4250DTR is housed in a 4 mm × 4 mm × 1.1 mm plastic land grid array (LGA-16) package with exposed pad for thermal performance and mechanical stability in vibration-prone applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-axis gyroscope applications.

Compared with LSM6DSOXTR and ADXRS649YDZ-RL, the A3G4250DTR uniquely balances automotive qualification, ultra-low power, and pure 3-axis digital gyro functionality in a compact LGA-16 package - making it optimal where cost, footprint, and AEC-Q100 compliance outweigh need for fused sensing or analog bandwidth.

Availability

A3G4250DTR is available at Aetrix Electronics and suitable for in-dash car navigation, telematics systems, and motion-controlled human-machine interfaces requiring stable component supply across automotive production lifecycles.

Supply support for A3G4250DTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, sensors, power ICs, and automotive-grade components.

The A3G4250DTR belongs to ST's high-stability MEMS motion sensor product line, engineered specifically for automotive and industrial applications demanding precision angular rate measurement under thermal and mechanical stress.

FAQ

What communication protocols does the A3G4250DTR support?

The A3G4250DTR supports both I²C (up to 400 kHz) and SPI (up to 10 MHz in 4-wire mode, or 3-wire with shared SDO/SDI). Interface selection is hardware-configured via the CS pin state, eliminating software initialization overhead. All registers are accessible through either protocol, and the device includes dedicated status bits for bus arbitration and error detection.

Does the A3G4250DTR require external passive components?

Yes - a mandatory external RC network must be connected to the PLLFILT pin (Pin 14) to stabilize the internal phase-locked loop, per Figure 3 and Table 3 in the datasheet. Additionally, decoupling capacitors (100 nF ceramic + 4.7 µF tantalum) are required on Vdd and Vdd_IO, and pull-up resistors (typically 4.7 kΩ) are needed for I²C lines. No external crystal or timing components are required.

How is the embedded FIFO used in motion-triggered applications?

The 32-level FIFO operates in three modes: bypass (direct streaming), FIFO (circular buffer with watermark interrupt), and stream (continuous read without overwrite protection). In motion-triggered use cases, INT1 is configured to assert when FIFO reaches a user-defined watermark level, enabling the host to fetch batches of angular rate data without constant polling - reducing CPU load and system power in telematics event recorders.

Is the A3G4250DTR pin-compatible with other ST gyroscopes?

No - the A3G4250DTR uses a proprietary 16-pin LGA layout optimized for its dual-interface architecture and PLLFILT requirement. It is not pin-compatible with ST's LSM6-series or older L3G4200D. Migration requires PCB redesign and firmware adaptation due to differences in register map, interrupt behavior, and filter configuration methodology.