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DRV5032: Some questions about Hall-effect switch magnetic field calculator

Part Number: DRV5032

Dear Team,

Our customer used calculator to design circuit, we have some questions as below.

Could you help to support it?

1. According to the data calculated on the website, is there air between the magnet and the sensor? Or other specific medium?

2. If there is metal (for example: aluminum) in the middle, will it affect the working distance of the sensor? If so, is there any way to initially calculate the working range of the sensor?

Many Thanks,



  • Jimmy,

    The calculations are assuming there is nothing capable of interfering with the magnetic field.  Ferromagnetic materials or other nearby magnets may interfere with the magnetic flux density and would impact these results.  However, most materials common in PCB design should not have any significant impact on these results.

    Again, aluminum which is not ferromagnetic should not impact the magnetic flux density from a fixed permanent magnet. In the case of oscillating magnetic fields, it would generate eddy currents and the field would be limited by the skin depth of the material, but a "DC" magnetic source will permeate.  Iron, Nickel and Cobalt are common metals capable of interference, and these would require more careful analysis.