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Old 16th December 2013, 10:09 AM   #1
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Default Low noise shunt referene?

The attached image is the noise density plot from the onsemi tl431 datasheet.

http://www.onsemi.com/pub/Collateral/TL431-D.PDF

Does anybody know of a better or comparable shunt reference availble in a sot23 or similar package?

Thanks
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File Type: png onsemi_tl431.png (39.1 KB, 118 views)
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Old 16th December 2013, 11:00 AM   #2
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That is about the same noise density as that of a 140k resistor, so I suspect a green LED or a zener would be much better
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Old 16th December 2013, 11:03 AM   #3
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It also depends on how accurate you need the reference to be. I use LM329. It is quite low noise, and stable enough.

A led should be very good, but I can't say it would certainly be rock stable. So you might tell us how critical the application is.

Have a look at this thread too:

Zener vs Led as reference
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Old 16th December 2013, 11:06 AM   #4
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The plot for the Sipex TL431 is marginally better. What's the application? When I need lower noise than the TI TL431 (considerably worse on paper than the OnSemi), I'll parallel them and/or filter the output.
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Old 16th December 2013, 11:29 AM   #5
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Hi - I would also suggest a LED (green, orange, yellow) combined with a CCS and a good capacitor(s) for decoupling. Yet i don't know you application ...

If LEDs are a possibility for you you might find Christer's measurements interesting (attachment)

Greetings,

Jesper
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