Lowest noise Zener Diodes? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 29th October 2012, 09:37 PM   #1
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Default Lowest noise Zener Diodes?

Which are the lowest noise Zener Diodes, either SMD or through hole, which are in current production, regardless of price?
  Reply With Quote
Old 29th October 2012, 10:14 PM   #2
Account disabled at member's request
 
Join Date: May 2006
Temp compensated ones like lm329. There are better ones but although you say regardless of price I doubt you want to fork out 60 to 70 dollars for a single part, these are used in space exploration equipment and satelites. Read linear technology application AN82F, very good info on there. You could also make yourself one, just combine a regular zener with a diode.
  Reply With Quote
Old 29th October 2012, 10:15 PM   #3
diyAudio Member
 
Join Date: Mar 2003
Location: Haarlem, the Netherlands
I don't know, but I do know that you should use a voltage well below 5 V if you want low noise, like 3.9 V or less. Higher voltage "zeners" actually have avalanche rather than Zener breakthrough, which causes much more noise.
  Reply With Quote
Old 29th October 2012, 11:21 PM   #4
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Quote:
Originally Posted by homemodder View Post
Temp compensated ones like lm329. There are better ones but although you say regardless of price I doubt you want to fork out 60 to 70 dollars for a single part, these are used in space exploration equipment and satelites. Read linear technology application AN82F, very good info on there. You could also make yourself one, just combine a regular zener with a diode.
Thanks.
Indeed, $60-70 a piece I cannot afford (since I need quite a few of those).
How do I combine a regular diode with a Zener to lower its' noise?
  Reply With Quote
Old 29th October 2012, 11:27 PM   #5
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Theoretically the lowest noise Zeners are for about 8.2V

Also, here is some list I fond in the Net:

CMHZ4099: 6.8 V, Low Noise Zener Diode
CMHZ4100: 7.5 V, Low Noise Zener Diode
CMHZ4101: 8.2 V, Low Noise Zener Diode
CMHZ4102: 8.7 V, Low Noise Zener Diode
CMHZ4103: 9.1 V, Low Noise Zener Diode
CMHZ4104: 10 V, Low Noise Zener Diode
CMHZ4105: 11 V, Low Noise Zener Diode
CMHZ4106: 12 V, Low Noise Zener Diode
CMHZ4107: 13 V, Low Noise Zener Diode
CMHZ4108: 14 V, Low Noise Zener Diode
CMHZ4109: 15 V, Low Noise Zener Diode
CMHZ4110: 16 V, Low Noise Zener Diode
CMHZ4111: 17 V, Low Noise Zener Diode
CMHZ4112: 18 V, Low Noise Zener Diode
CMHZ4113: 19 V, Low Noise Zener Diode
CMHZ4114: 20 V, Low Noise Zener Diode
CMHZ4115: 22 V, Low Noise Zener Diode
CMHZ4116: 24 V, Low Noise Zener Diode
CMHZ4117: 25 V, Low Noise Zener Diode
CMHZ4118: 27 V, Low Noise Zener Diode
CMHZ4119: 28 V, Low Noise Zener Diode
CMHZ4120: 30 V, Low Noise Zener Diode
CMHZ4121: 33 V, Low Noise Zener Diode
CMHZ4122: 36 V, Low Noise Zener Diode
CMHZ4123: 39 V, Low Noise Zener Diode
CMHZ4124: 43 V, Low Noise Zener Diode
CMHZ4125: 47 V, Low Noise Zener Diode
CMHZ4614: 1.8 V, Low Noise Zener Diode
CMHZ4615: 2 V, Low Noise Zener Diode
CMHZ4616: 2.2 V, Low Noise Zener Diode
CMHZ4617: 2.4 V, Low Noise Zener Diode
CMHZ4618: 2.7 V, Low Noise Zener Diode
CMHZ4619: 3 V, Low Noise Zener Diode
CMHZ4620: 3.3 V, Low Noise Zener Diode
CMHZ4621: 3.6 V, Low Noise Zener Diode
CMHZ4622: 3.9 V, Low Noise Zener Diode
CMHZ4623: 4.3 V, Low Noise Zener Diode
CMHZ4624: 4.7 V, Low Noise Zener Diode
CMHZ4625: 5.1 V, Low Noise Zener Diode
CMHZ4626: 5.6 V, Low Noise Zener Diode
CMHZ4627: 6.2 V, Low Noise Zener Diode

And here are Soviet diode-compensated Zeners for 9V, $3/dozen:

D818G USSR Zener Diodes Lot of 12 | eBay
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 29th October 2012, 11:34 PM   #6
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quote:
Originally Posted by Joshua_G View Post
How do I combine a regular diode with a Zener to lower its' noise?
You can't.

Best Zeners are 6.2V, which sits on the cusp of Zener and avalanche. Forward biased red LEDs are even quieter.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 29th October 2012, 11:44 PM   #7
diyAudio Member
 
Joshua_G's Avatar
 
Join Date: Nov 2008
Location: Small village, Israel
Thanks, all.
  Reply With Quote
Old 29th October 2012, 11:44 PM   #8
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

Parallelling cheaper devices is the obvious answer if noise is really an issue.

Theoretically 2 devices drop noise by 3dB, 4 by 6dB, 8 by 9dB etc, but
practically its never that simple and the point of no real benefit reached
for extra devices are 2 devices to about 6 devices usually.

(Might be a bigger number with devices not designed for low noise, but
that is pointless, you want cheap low noise devices in the first place.)

rgds, sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 29th October 2012 at 11:53 PM.
  Reply With Quote
Old 30th October 2012, 01:44 PM   #9
rsavas is offline rsavas  Canada
diyAudio Member
 
Join Date: Aug 2012
Location: Ontario
Would a TL431 be lower noise than a zener. I have read that the ones from ONSEMI are the lowest noise of the various mfgs.
  Reply With Quote
Old 30th October 2012, 01:53 PM   #10
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
I thought 431 were a lot noisier.
__________________
regards Andrew T.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Some noise measurements for LEDs and zener diodes Christer Parts 127 25th November 2011 11:47 PM
15V zener diodes mantisory Vendor's Bazaar 0 16th November 2007 11:55 PM
very ignorant question on zener diodes jarthel Parts 1 13th October 2006 01:17 PM
Bride of ZEN zener diodes ding Pass Labs 21 3rd June 2006 04:31 PM
[Hybrid Amp] Questions about the use of zener diodes Johnix Solid State 30 26th September 2004 08:00 AM


New To Site? Need Help?

All times are GMT. The time now is 03:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2