[volt-nuts] Voltage Reference.

Andreas Jahn Andreas_-_Jahn at t-online.de
Wed Nov 5 14:32:35 EST 2014

Hello Dan,

yes the thermal shield is standard on all LM399.
But additional thermal shielding of the pins/housing on both sides of the
PCB will improve stability (noise + tilting effects).

Since National Semiconductors (TI) has discontinued the LM399,
Linear Technology is now the only manufacturer.
DigiKey has the LM399 on stock.

With best regards


Am 05.11.2014 um 20:02 schrieb Dan Kemppainen:
> Andreas,
> If I proceed down this path, it will be a learning experience. As with
> most learning projects, a bit of 'overkill' is usually present.
> It's just plain old fun to over engineer something! :)
> The LM399 does look like a nice package. Do they all come with the
> thermal shield, or is that an option that needs to be purchased separately?
> Dan
> On 11/5/2014 12:00 PM, volt-nuts-request at febo.com wrote:
>> Message: 1
>> Date: Tue, 04 Nov 2014 19:20:09 +0100
>> From: Andreas Jahn <Andreas_-_Jahn at t-online.de>
>> To: Discussion of precise voltage measurement <volt-nuts at febo.com>
>> Subject: Re: [volt-nuts] Voltage Reference.
>> Message-ID: <545918D9.2020105 at t-online.de>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>> Hello Dan,
>> If you dont need the low noise and long term stability of the LTZ1000 then
>> the LM399 will do the job without special resistors (like T.C. less than
>> 5ppm/K).
>> The only thing that I recommend is to do a good thermal isolation for
>> the references.
>> With best regards
>> Andreas
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