Dwayne Reid wrote:
> Gosh!
>
> I've had good luck with some of the tiny thermistors from 
> Panasonic.  They claim 1% accuracy - the few dozen each out of 
> several batches of 100 that I tested over a period of a year or so 
> all met their spec.
>
> Panasonic ERT-J1VG103FA
> THERMISTOR NTC 10K OHM 1% 0603
> Digikey P12011CT-ND
> 1,000 quantity @ 0.13678 = $136.78
>
> I used them for 2 different products: heated skate blades 
> (ice-hockey) and temperature monitoring for hot water heating system 
> controllers.
>
> What problems have you been having, Bob?  Which thermistors were you using?
>
> dwayne
>
>
> At 11:15 AM 3/20/2008, Bob Axtell wrote:
>
>   
>> We have just made the decision to use the Maxim/Dallas DS1822
>> 1-wire thermometer. I cringe when I use anything from Maxim;
>> they make their chips out of unobtanium, but I have no choice, as
>> I would like to keep the same pinning for the battery packs (+/-/temp).
>> Instead of installing the thermistor, the battery pack maker will instead
>> install the DS1822, with GND wire connected to GND and VDD, and
>> the I/O pin going out to the battery connector.
>>     
>
>
>   
These are the ones designed to be used in battery packs. They boast 5% 
tolerance, but at 50C they
are sometimes out of range. They are made by "American" something. They 
are designed especially
for battery packs. About 1 out of 4 battery packs seems to have a 
thermistor that is out of tolerance
at 50C. I haver been screwing around and now the boss wants to go with 
the smarter chip, since it
has a 2C tolerance, which is 1% or so, well within our needs. It will 
save us a couple of hours,
methinks

Unfortunately, 0603 parts can't be used  here; too small for them to 
work with.


--Bob Axtell
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