At first thought, the TO-92 would be better because it is not thermally
linked to the board, until you realize that it IS, with 3 leads. I do
believe that the SMT part would be more strongly coupled to the thermal
mass of the PCB though. Experimentation would be necessary.
--
--
Martin Klingensmith
http://infoarchive.net/
http://nnytech.net/


Bob Axtell wrote:
> Actually, I was wondering the same thing... I have an application where
> I need to measure product ambient temp.
> It it more accurate if mounted on the PCB, or in the air? Did anybody do
> that kind of testing before?
>
> --Bob
>
> Charles Craft wrote:
>
>> http://buy.microchip.com/chart.aspx?branchID=2001&mid=11
>>
>> Microchip temp sensors come in PDIP and SMT packages.
>>
>> The "great when they work" Dallas/Maxim parts come in a TO-92
>> thru-hole package.
>>
>> Is there a big difference in temp response for board mounted versus
>> "up in the air" sensors.
>> Does the actual chip package dampen the response more than the PCB a
>> SMT a part is attached to?
>>
>> thanks
>> chuckc
>>

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