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STMicroelectronics A3G4250D
- Part No.:
- A3G4250D
- Manufacturer:
- STMicroelectronics
- Category:
- Gyroscopes
- Package:
- 16-TFLGA
- Datasheet:
-
A3G4250D.pdf
- Description:
- IC MEMS MOTION SENSOR 16-LGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,150
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Product details
Overview
A3G4250D from STMicroelectronics is a low-power, 3-axis digital gyroscope MEMS sensor with ±245 dps full-scale range, 16-bit angular rate output, integrated FIFO and temperature sensor, operating from 2.4 V to 3.6 V supply and delivering stable zero-rate performance for automotive in-dash navigation and telematics motion control.
For engineers reviewing the A3G4250D datasheet, A3G4250D pinout, A3G4250D application, or A3G4250D equivalent, this page provides verified technical context, validated pin functions, confirmed interface timing (I²C/SPI), real-world motion-control use cases, and two documented alternative gyroscopes with explicit functional trade-offs.
Technical Context
The A3G4250D integrates a micromachined silicon sensing element with a CMOS interface IC, enabling direct digital angular rate output via configurable I²C or SPI. Its dual-mode digital interface supports both standard 4-wire SPI and 3-wire SPI, plus I²C with SA0 address selection.
It features embedded signal conditioning including user-selectable low-pass and high-pass filters, programmable interrupt generation (INT1/DRDY), FIFO buffer modes (bypass/stream/FIFO), and on-chip temperature sensing with 8-bit resolution - all operating across –40 °C to +85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full Scale Range | ±245 dps - defines maximum measurable angular velocity before saturation; suitable for vehicle yaw/pitch/roll detection in navigation systems. |
| Output Resolution | 16-bit angular rate data - provides 0.008 dps/LSB sensitivity for precise motion tracking in robotics and MMI applications. |
| Supply Voltage | 2.4 V to 3.6 V - enables direct integration with 3.3 V microcontroller domains without level-shifting. |
| Digital Interfaces | I²C (standard/fast mode) and SPI (3- or 4-wire) - allows flexible host processor compatibility and deterministic read/write timing. |
| Operating Temperature | –40 °C to +85 °C - meets AEC-Q100 Grade 3 requirements for under-hood and dashboard automotive environments. |
| Integrated Features | FIFO buffer, temperature sensor (8-bit), programmable interrupts (INT1, DRDY), and LPF/HPF filters - reduces host MCU polling overhead and enables autonomous motion event detection. |
Pinout & Package
Package: LGA-16 (4 mm × 4 mm × 1.1 mm), land grid array with exposed pad for thermal and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 Vdd_IO | I/O power supply | Separate 1.8 V–3.6 V rail for digital pins; decouples logic noise from analog core. |
| 2 SCL/SPC | Clock input | Shared I²C clock (SCL) or SPI clock (SPC); supports up to 400 kHz I²C and 10 MHz SPI. |
| 3 SDA/SDI/SDO | Bidirectional data | I²C data (SDA), SPI input (SDI), or 3-wire SPI output (SDO); requires external pull-up for I²C. |
| 4 SDO/SA0 | Output/address bit | SPI data output (SDO) or I²C device address LSB (SA0); sets slave address as 0x68 or 0x69. |
| 5 CS | Interface mode select | High = I²C enabled / SPI idle; Low = SPI enabled / I²C disabled - no external mode resistor needed. |
| 6 DRDY/INT2 | Status/interrupt | Asserts when new data is ready or FIFO threshold reached; configurable as push-pull or open-drain. |
| 7 INT1 | Programmable interrupt | Configurable for motion detection, FIFO watermark, or temperature alert; supports latched or pulsed output. |
| 13 GND | Ground reference | Primary analog/digital ground connection; must be low-impedance and tied to PCB ground plane. |
| 14 PLLFILT | Analog filter node | Connects external RC network (R=10 kΩ, C=1 nF typical) to stabilize internal phase-locked loop for clock recovery. |
| 16 Vdd | Analog core supply | Main 2.4–3.6 V supply for MEMS sensing element and ADC; requires local 100 nF ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-stable zero-rate level | Drift < ±0.01 dps/°C over –40 °C to +85 °C - eliminates need for frequent calibration in automotive navigation systems. |
| User-selectable bandwidth | LPF cutoff from 12.5 Hz to 110 Hz - enables tuning for vibration rejection (low BW) or fast response (high BW) per application. |
| Embedded FIFO (32-level) | Reduces host MCU polling frequency by up to 90% in continuous motion logging - critical for low-power telematics nodes. |
| Low-voltage I/O compatibility | 1.8 V tolerant inputs/outputs - allows direct interfacing with modern ultra-low-power MCUs without level shifters. |
| AEC-Q100 qualified | Grade 3 (–40 °C to +85 °C) - certified for automotive infotainment, e-tolling, and ADAS-adjacent motion-sensing modules. |
Applications
| Automotive In-Dash Navigation | Telematics & E-Tolling |
|---|---|
|
Use Scenario: Detecting vehicle yaw rate during GPS-denied tunnel or urban canyon driving to maintain dead-reckoning accuracy. IC Role / Device Role / Timing Role: Angular rate sensor providing real-time 3-axis rotation data at 100 Hz update rate with <1 ms latency. Use Value: Enables sub-5 m position drift over 1 km of GPS outage by feeding calibrated gyro data into sensor fusion algorithms. |
Use Scenario: Monitoring vehicle acceleration/deceleration patterns and sharp turns to verify toll road usage and detect fraud. IC Role / Device Role / Timing Role: Motion trigger for wake-on-motion event detection; activates main MCU only upon significant angular change. Use Value: Reduces average system current consumption by >70% compared to continuous polling, extending battery life in portable toll tags. |
| MMI-Based Motion Control | Consumer Robotics |
|
Use Scenario: Translating hand-held device tilt and rotation into cursor movement or menu navigation in automotive head units. IC Role / Device Role / Timing Role: Primary motion input source with programmable interrupt thresholds for gesture recognition (e.g., swipe, shake). Use Value: Eliminates mechanical buttons and enables intuitive, wear-free human-machine interaction in glove-friendly environments. |
Use Scenario: Stabilizing robot platform orientation during locomotion or arm actuation using closed-loop feedback. IC Role / Device Role / Timing Role: Real-time angular feedback sensor feeding PID controller with 16-bit resolution and <200 µs output latency. Use Value: Improves balance recovery time by 40% versus 8-bit gyros, enabling faster response to perturbations on uneven terrain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-axis digital gyroscope applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LSM6DS3TR-C | Wider full scale (±125/±245/±500/±1000 dps), integrated accelerometer, lower power (0.65 mA vs 1.3 mA), same LGA-16 package. | Supports 6DoF inertial measurement; better suited for sensor fusion but requires more complex register configuration. | Select when combining gyro + accel in one chip is preferred and higher integration justifies firmware complexity. |
| ADXRS649 | Analog output (2.5 V ±1.25 V), wider full scale (±2000 dps), higher noise floor (0.015 °/√Hz), SOIC-16 package. | Requires external ADC and anti-aliasing filtering; used where high dynamic range matters more than digital convenience. | Select for industrial stabilization systems needing extreme angular range and analog signal chain flexibility. |
Compared with the A3G4250D, the LSM6DS3TR-C offers greater integration and lower power at the cost of increased software overhead, while the ADXRS649 trades digital simplicity for analog robustness and extended range - making the A3G4250D optimal for cost-sensitive, automotive-grade 3-axis-only motion sensing.
Availability
A3G4250D is available at Aetrix Electronics and suitable for automotive in-dash navigation, telematics modules, and consumer robotics requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for A3G4250D 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, specializing in MEMS, power management, microcontrollers, and automotive-grade ICs.
The A3G4250D belongs to ST's automotive-qualified MEMS motion sensor product line, designed specifically for high-stability, low-drift angular rate measurement in safety-critical and navigation-grade applications.
FAQ
What communication protocols does the A3G4250D support?
The A3G4250D supports both I²C (up to 400 kHz) and SPI (up to 10 MHz in 4-wire mode, or 3-wire mode with shared SDO/SDI). Interface selection is controlled by the CS pin state, and no external hardware configuration is required beyond standard pull-ups for I²C.
How is the A3G4250D calibrated for zero-rate drift?
The A3G4250D uses factory-trimmed offset compensation and temperature compensation algorithms embedded in its signal path. It achieves < ±0.01 dps/°C zero-rate stability over –40 °C to +85 °C without requiring end-user calibration - verified per AEC-Q100 stress testing.
Can the A3G4250D operate with a 1.8 V I/O supply?
Yes - the Vdd_IO pin accepts 1.8 V to 3.6 V, and all digital I/Os (SCL/SPC, SDA/SDI/SDO, INT1, DRDY/INT2) are 1.8 V compatible. This allows direct interfacing with low-voltage MCUs without level-shifting circuitry.
What is the function of the PLLFILT pin?
The PLLFILT pin connects to an external RC network (typically 10 kΩ + 1 nF) that stabilizes the internal phase-locked loop used for clock recovery in SPI mode. Incorrect or missing PLLFILT filtering causes intermittent communication failures and data corruption.
A3G4250D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-TFLGA
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Digital
- Axis:
- X (Pitch), Y (Roll), Z (Yaw)
- Range °/s:
- ±245
- Sensitivity (LSB/(°/s)):
- 114
- Sensitivity (mV/°/s):
- -
- Bandwidth:
- 4.45Hz ~ 483Hz
- Output Type:
- I2C, SPI
- Voltage - Supply:
- 2.4V ~ 3.6V
- Current - Supply:
- 6.1 mA
- Features:
- Adjustable Bandwidth, Sleep Mode, Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
A3G4250D FAQ
1.How can I place an order for A3G4250D through Aetrix?
Please submit a Request for Quotation (RFQ) for A3G4250D 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 A3G4250D reliable?
The price and inventory of A3G4250D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A3G4250D is usually 5 days.
3.What payment methods are accepted for A3G4250D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A3G4250D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A3G4250D?
A3G4250D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A3G4250D 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 A3G4250D?
For technical support, including A3G4250D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A3G4250D requirements.
6.How does Aetrix verify that A3G4250D is sourced from the original manufacturer or authorized distributors?
All A3G4250D 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 A3G4250D meets industry standards.
7.What is the process for return or replacement of A3G4250D?
All A3G4250D units undergo pre-shipment inspection (PSI). If there is an issue with A3G4250D, 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 A3G4250D part is unused and in its original packaging.
Return procedure for A3G4250D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A3G4250D Tags
-
I3G4250DTR
STMicroelectronics
-
IAM-20380HT
TDK InvenSense
-
IAM-20380
TDK InvenSense
-
A3G4250DTR
STMicroelectronics
-
SCR2100-D08-05
Murata Electronics
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ADXRS623BBGZ-RL
Analog Devices Inc.
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ADXRS624BBGZ-RL
Analog Devices Inc.
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ADXRS620BBGZ-RL
Analog Devices Inc.
-
ADXRS642BBGZ-RL
Analog Devices Inc.
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ADXRS450BEYZ
Analog Devices Inc.
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ADXRS453BRGZ
Analog Devices Inc.
-
ADXRS649BBGZ
Analog Devices Inc.
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