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TMP302: Thermal Sensitivity

Keith Keller
Expert 7080 points
Part Number: TMP302

Hello,

We're working with the TMP302 and seeing some differences when device trips.

  • Which pin on the IC is being monitored for temperature?
  • Does is matter the level of solder used?  Or how far off the PCB the IC might be?
  • Has there been an investigation on using thermal paste under the IC?

Thank you, Keith

  • 0
    TI__Genius 10455 points

    HI Keith,

    Let me try to answer your questions one by one:

    • This device is a temperature switch, so it doesn't output the actual temperature measured, but rather the OUT pin will trip low when the temperature threshold that is set by the TRIPSET0 and TRIPSET1 pins is crossed. So no pin outputs the temperature itself.
    • It does to some extent matter how much solder is used, too much or an uneven amount can cause strain on the sensor, which can lead to temperature errors (and perhaps an incorrect tripping on the output). How much solder were you considering using, and how far off the PCB were you targeting? I think whatever you normally do for any other IC reflow would be fine, this device does not have special reflow rules.
    • We have not done an investigation on placing thermal paste under the IC, what are you trying to sense here? A component on the other side of the PCB? In the datasheet, we have a layout recommendation to follow:

    Thanks

    -Alex Thompson