[sdiy] Thermosensitive Chip Resistors

[Tim Parkhurst]

This part number

P1.0KCDCT-ND

Is for a pack of 10 pieces (0805 in cut tape)

Tim Servo


> -----Original Message-----
> From: Brice D. Hornback [mailto:bdh at cyberbound.net]
> Sent: Friday, January 09, 2004 3:25 PM
> To: Synth-DIY
> Subject: Re: [sdiy] Thermosensitive Chip Resistors
> 
> I am looking at the 1k 3300ppm version (DigiKey # P1.0KCHTR-ND) and can
only
> find a minimum order quantity of 5000.  Has anyone found a part number for
> these that can be ordered in significantly smaller quantities?
> 
> Thanks,
> Brice
> 
> ----- Original Message -----
> From: "Ian Fritz" <ijfritz at earthlink.net>
> To: "Jay Schwichtenberg" <jays at aracnet.com>; "Synth-DIY"
> <synth-diy at dropmix.xs4all.nl>
> Sent: Saturday, January 03, 2004 4:50 PM
> Subject: Re: [sdiy] Thermosensitive Chip Resistors
> 
> 
> > Hi Jay --
> >
> > These tempcos have been in the Digi catalog for some time now.  There
was
> a
> > previous discussion about them here last spring, which you might want to
> > look up.
> >
> > I measured the temperature dependent resistance on one of the large size
> > (0805) 1.8k units, using a special setup with a large Al block for
thermal
> > stability/uniformity and a calibrated Wheatstone bridge.  I found that I
> > had a bit of difficulty with small drifts in the readings, probably due
to
> > self-heating effects.  The tempco came out OK at about 3350ppm/K.
> However,
> > the quadratic coefficient of the fit came out several times larger that
> for
> > other (full-size) tempcos I have measured.
> >
> > A 10% tolerance in the tempco is typical, although 5% is sometimes
> > found.  That's why I developed the dial-a-tempco circuit.
> >
> > I haven't tried these tempcos in an actual VCO yet, but they should be
OK
> > unless you are real fussy about drift.  At least they are affordable.
> >
> >    Ian
> >
> >
> > At 08:35 PM 1/2/2004, Jay Schwichtenberg wrote:
> > >I was thumbing (OK, drooling) at the new Digikey catalog I got today. I
> > >found these thermosensitive chip resistors in it:
> > >
> > >http://www.panasonic.com/industrial/components/pdf/AOF0000CE1.pdf
> > >
> > >Page 865 in catalog T041.
> > >
> > >They look interesting since some have a PTC of 3300 ppm/C, come in 1K
and
> > >can fit under a chip. Only issue looks to be the +/-10% tracking
> tolerance.
> > >Anyone have any ideas if these would be good enought for expo tempco?
> > >
> > >Thanks
> > >Jay
> >



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