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Mounting an LM34AC for best thermal response

Stephen Van Buskirk
Prodigy 20 points
Other Parts Discussed in Thread: LM34

I plan to use the LM34AC for sensing temperature in a wall mounted thermostat. The remote sensors will use the TO-92package, but  I'm not sure how to best measure temperature in the wall mounted unit. I can put a hole in the case, stick the TO-92 through the case to the outside surface of the case, or stick it out a bit and epoxy it in place. However, this is a rather messy solution.

It occurred to me that if I used the SOIC package I could connect the unused pins to the thermostat case (with static protection) so the pins would transfer the temperature into the IC package and so to the sensor better than through the exposed part of the case of a TO-92.

Does anyone think this would work?

  • 0
    TI__Expert 7220 points
    Hi Stephen,

    Can you please provide a drawing of your proposals?

    One option is to have a hole in the case of your thermostat and place the TO-92 or SOIC package as close to this hole as possible. This will be the best way to detect the ambient temperature in the room. Remember that the LM34 best detects temperature through its leads. Make sure LM34 is far away from any heat generating circuitry on your system such as power supplies or microprocessors that emit a lot of heat. After all you want to detect the ambient temperature of the room, not the heat of your circuitry!

    -Michael Wong