[volt-nuts] Batch of old reference zeners

[Jan Fredriksson]

I have a batch of voltage references ICs on the shelf, several thousand of
each type. They all have date codes of around 1983, ie 30 years old. It
would be great to have some drift data on them.

The ones listed below are the best of the bunch.

- AS431, TO-92 and SOIC-8, 20ppm/C 120nV/sqrtHz (0.5% or 0.1%?)

- LM385Z, TO-92, 80ppm/C, 600nV/SqrtHz, 60uV, 20ppm/SqrtKhr

- LM329CZ, TO-92, 75nV/sqrtHz, 30ppm/C 7uV noise 20ppm (8ppm?) /SqrtKhr.
- AS2951/2954, SOIC-8, 20ppm/C

I am willing to send a handful (like at least 50 pcs) to anyone who can set
up and monitor the drift of them for a few months and send me some data.

Any takers?

I will do similar monitoring myself, but would appreciate data from others,
that's why I am doing this.

I am also building some other references to compare with, based on LTZ1000
and other zeners.

I am not asking anything in return, except that you return drift data,
measured with some decent method, ie single digit ppm stability.
If you happen to have some resistors rated like 10ppm/C or lower, surface
or hole mount, I'd appreciate some of those in return, in values 1K-10K,
but that is not a requirement.

Jan