AS5043
Data Sheet – Choosing the Proper Magnet
15 Choosing the Proper Magnet
Typically the magnet should be 6mm in diameter and ≥2.5mm in height. Magnetic materials such as rare earth AlNiCo,
SmCo5 or NdFeB are recommended.
The magnet’s field strength perpendicular to the die surface should be verified using a gauss-meter. The magnetic field
Bv at a given distance, along a concentric circle with a radius of 1.1mm (R1), should be in the range of ±45mT…±75mT.
(see Figure 18).
Figure 18: Typical Magnet and Magnetic Field Distribution
typ. 6mm diameter
N
S
Vertical field
component
Magnet axis
Magnet axis
Bv
R1
(45…75mT)
Vertical field
component
0
360
360
R1 concentric circle;
radius 1.1mm
15.1 Physical Placement of the Magnet
The best linearity can be achieved by placing the center of the magnet exactly over the defined center of the IC package
as shown in Figure 19.
Figure 19: Defined IC Center and Magnet Displacement Radius
3.9 mm
3.9 mm
1
2.433 mm
2.433 mm
Defined
center
Rd
Area of recommended maximum
magnet misalignment
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