Electronics > Metrology

Tesla MAC199/MAE299/MAB399 and MAC01 : teardown and tests

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TiN:
Toy box from Czesh republic got into my hands from one of my readers :)
Knowing my precision-sickness there are no less than 12 x MAB399 ovenized 7V references, which are on first glance clone of LM399 series, one MAC01 (10V trimmable reference in metal can 8-pin LTZ-style package and pair of Pt100 RTDs.



I was wondering if these MAB399 any good, as they are rather cheapies (if one can find them :).



Let's take a look on datasheet first..



Package is much taller (both zener can and outer plastic box), but following same style as LMx99. Nominal output voltage is bit higher, 7.25V +/-5%, same dynamic impedance <1.5Ohm, <5ppm/K TC (LT LM399 rated <2ppm/K for -A version, <1ppm/K f or regular), no max specification for noise on MAB399.

Now let's look under the hood. I milled top of the can on one of MAB399's and took quick photo:



Stay tuned..

P.S. I know there is another MAB399 thread in here, but decided not to necropost.

TiN:
TBD.

We can see die marking has MAC199, so it mean all three chips are same, just the sorting/binning and/or ageing is different on those SKUs.

For comparison LM399 photo, provided by Gyro in LM399 thread:

Vgkid:
I wait for updates.

quarks:
Looks interesting
Thanks for sharing

branadic:
There has been another thread about MAC199 before:

https://www.eevblog.com/forum/projects/tesla-mab399-mac199-voltage-references/

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