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INA146: INA146 High Voltage Isolation

David Kramer
Prodigy 40 points
Part Number: INA146

I have an application where I need to measure differentially a voltage that is nominally between 5 and 25 volts.  However, under overload conditions, the input can go as high as 72 volts.  The INA146 looks like it can handle this with a unipolar 12 volt supply.  My question is about the isolation of the input pins.  The SOIC package has pins on .050 inch centers while the insulation distance is much smaller.  What do you recommend to handle this?  I could conformal coat these components if absolutely necessary.  Thanks.

  • 0
    Guru 140200 points

    Hi David,

    you get a creepage distance of about 0.7mm. So if moisture or dirt is an issue, I would use a protective coating:

    Kai

  • 0
    TI__Mastermind 48076 points

    Hi David,

    Yes, conformal coating is a good way to get rid of potential contamination and isolate the input pins as suggested by you and Kai. It is always good practice to place conformal coating over the components and PCB (most of application) to protect again environmental changes such as high %RH/dew point, finger prints/oil contamination, dust particles etc.. 

    Best,

    Raymond