Product description
AK09974C – Ultra-Compact 3D Magnetic Field Sensor
The AK09974C is a high-performance 3-axis magnetic field sensor capable of detecting magnetic fields along the X, Y and Z axes in a single miniature package. Combined with a magnet, it offers a simple yet precise solution for rotation angle measurement or stroke displacement sensing.
Wide measurement range for stable sensing
With ±78 mT (XY) and ±200 mT (Z), magnets can be positioned closer to the sensor, reducing external magnetic interference and improving overall stability.
High resolution & low noise
The sensor delivers 16-bit digital output using low-noise Hall-based technology, supporting:
- Arctangent angle calculation
- Magnetic switch mode
- I3C-based interrupt control
Miniature Package
The 4-pin WLCSP form factor makes the AK09974C ideal for space-constrained devices such as wearables, AR/VR equipment and compact embedded modules.
Applications
- Wearables & smartwatches
- Angle measurement (arctan)
- Stroke & displacement sensing
- Miniature encoders
- IoT & sensor nodes
- AR/VR motion systems
Specifications
| Feature | Specification |
|---|---|
| Axes | 3 (X, Y, Z) |
| Measurement Range | ±78 mT (XY), ±200 mT (Z) |
| Sensitivity | 1.1 μT/LSB |
| Resolution | 16-bit |
| Technology | Hall-based |
| Supply Voltage | 1.65–1.9 V |
| Interfaces | I²C / I3C |
| Package | 4-pin WLCSP |
| Features | Arctan, Magnetic Switch, Interrupts |
FAQ – Frequently Asked Questions
FAQ – Frequently Asked Questions
What applications is the AK09974C best suited for?
Angle measurement, displacement sensing, encoders and compact wearable devices.
What is the magnetic range?
±78 mT (XY) and ±200 mT (Z).
Does the sensor support I3C?
Yes, with interrupt functionality.
Is it suitable for wearable form factors?
Yes, thanks to its ultra-small WLCSP footprint.
Does it include built-in angle calculation?
Yes, it includes integrated arctan calculation.
Technical question? Talk to our FAEs.
Our Field Application Engineers support you with platform selection, integration and the path to series production – across manufacturers.
