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TMAG5231: Effect of metal behind the hall sensor

Priya Lakshmi
Prodigy 60 points
Part Number: TMAG5231


Tool/software:

Hi,

I am planning to use TMAG5231C sensors in our application which will be mounted on the PCB. Behind the PCB, I plan to use a connector with metallic latch, something similar to https://www.samtec.com/products/isdf

I need a good latching mechanism because the board is dynamic and keeps moving. 

Question is will this metal latch impact the sensor, though it is not in the path of detection?

Thanks,

Priya

  • 0
    TI__Mastermind 21940 points

    Priya,

    Thanks for reaching out.  In most cases, you won't find significant impact in your system from copper or aluminum unless the magnet is moving rapidly.  The main concern will be with materials which are ferromagnetic; the most common being iron, nickel, and cobalt.  Looking at the materials report for this particular connector, I see there is a small percentage of all three of these elements, so there may be some minor influence, but the metal composition is predominantly copper.  Even still, in certain metal alloys (like Austenitic stainless steels) that contain these elements are not always considered ferromagnetic.

    Ferromagnetic metals provide a path of low reluctance for the field, and tend to draw more of the magnetic field towards them.  As a result, it may be possible that you would observe slightly increased magnetic flux density at the sensor location than you would if the connector was not present.  Unless everything is very close together, I wouldn't anticipate this creating a highly significant change in your performance since there is so very little iron, nickel, or cobalt.  I would recommend requesting a sample of the connector you want to use and then checking to see if a permanent magnet has any attraction to it to confirm this idea.

    Thanks,

    Scott