Better than LM329 and SMD

[peranders]

Hi!

Just wondering if anyone knows about a similar or better reference diode than LM329 but in SO08 or SOT23? I'm looking for a LM431 with lower noise.... and not too high price either.

The drawback of LM329 is the low voltage tolerance. I have searched but I can't find anything suitable.

I could use the LTZ1000, but it's not available in SMD....
http://www.linear.com/prod/datasheet.html?datasheet=141

 

[Bricolo]

I'm also looking for a good voltage reference.

The lm329 is nice. But it seems that NS wants to discontinue it.
That's sad, because it has better specs that all theyr newer voltage references

 

[suf]

It's been a while, this post appeared here, but I think this is still relevant as the Walt Jung's regulator uses LM329.
Here is the solution from Walt Jung from 2019 (less DC stability, but better noise figures):
https://refsnregs.waltjung.org/The_PM829_Reference.pdf

 

[Vovk Z]

I use LM4041 series when I need something better than LM431 - some of LM4041 devices are popular and cheap enough.

 

[suf]

It is noisy according to the datasheet. The LM329 has 7uV noise on 6.9V output while the LM4041 has 20uV on 1.2V out (extrapolating to 6.9V it will be 115uV).
The article mentioned 20nV/sqrt(Hz) equivalent to 2uV on the same conditions above (6.9V output and 10Hz-10kHz spectrum)

 

[soekris]

I use the LM341 everywhere, but add a simple RC filter on the outout when it need to be low noise....