[volt-nuts] Matched resistors

Tom Knox actast at hotmail.com
Wed Jul 16 23:48:52 EDT 2014

Hi Randy;
I would look at Visha Foil resistors
Hope that helps.
Thomas Knox

> Date: Wed, 16 Jul 2014 17:44:10 -0700
> From: randyevans2688 at gmail.com
> To: volt-nuts at febo.com
> Subject: [volt-nuts] Matched resistors
> I am building a 10V voltage reference based on the LTZ1000 and the design
> is essentially done but I am looking for a pair of matched resistors that
> track very closely over temperature.  The absolute value of the pair is not
> important, anything between 50K and 200K ohms would be ideal, but the
> matching ratio is very important.
>  I looked at the 100K ohm LT5400 quad resistor array from Linear Technology
> but it has a worst case long term accelerated shelf life spec of 10 ppm (at
> 150C) matching ratio and long term matching ratio drift of <4ppm (at 70C).
>  I would like something much tighter if possible since that would mean I
> likely don't need an oven for a couple of ppm worst case accuracy over time
> and temperature.  I can make the LT5400 work but I would need to do
> temperature characterization and circuit compensation.  Doable but
> undesirable.
> Does anyone have any ideas for a good ratio matched resistor pair,
> hopefully not too expensive?
> Thanks,
> Randy Evans
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