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CSD17484F4: Vgs threshold electrical specs & limit

Leo Chow
Expert 3120 points
Part Number: CSD17484F4

Hi,

I'm browsing through the Vgs(th) spec on the electrical characteristic table for CSD17484F4. Given the min & max valued at 0.65V & 1.1V respectively, can we assume that this part guaranteed to turn off below 0.65V? The operating temp of my application is -30 to 60 degrees C. Thanks.

BR,

Leo

  • +1
    TI__Expert 6985 points

    Leo,

    Thanks for your interest in our FETs.

    The definition of threshold is a voltage at which the device conducts 250uA, below this threshold voltage the device is classified as off. So in the case of the CSD17484F4, this 250uA is reached between 0.65V and 1.1V @ 25degC.

    Threshold voltage various linearly with voltage, see fig 6 in the CSD17484F4 datasheet. Typical threshold at 25degC is about 0.85V. This will increase to nearly 1V @ -30degC and decrease to about 0.75V @ 60degC.

    In your design, to ensure the device is off with a temperature of 60degC, worst case the threshold would be 0.1V less than the 0.65V min, so 0.55V. As such would need to make sure the "off "voltage is < 0.55V to be completely safe. Though the chances of getting a part with this low 0.65Vth @ 25degC, 0.55 @ 60degC is very small.