> housings for TO-92 types and similar would be enough of an
> insulator to significantly increase the response time.  Will the
> metal can versions (TO-39 IIRC) be considerably faster?

'dude, the LM34/LM35 datasheets show that the TO-46 metal
can is significantly faster than the TO-92 for stirred oil. Handy if
you're measuring stirred oil

TO-46  = 3 seconds to 100%
TO-92  > 8 seconds to 100%

AD590 comes in a can too (pricey, last time I looked)

Response in still air though shows the same curve for both packages,
200s to 100%. There's a curve for Thermal Time Constant vs air
velocity as well

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