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Old 23rd November 2008, 10:35 AM   #1
405man is offline 405man  Scotland
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Default CD4066 Switch replacement

Can anyone recommend a modern low distortion pin compatible replacement for the CD4066 or failing that something that is not pin compatible

Stuart
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Old 23rd November 2008, 12:21 PM   #2
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I've found for some older equipment, only a 4066 will do. The CD4066B and many others are an active component with TI, and you can order right from their web site. There are many "DG" prefix parts like DG419 that are good for new designs, depending on voltage, number of switches, etc, but I don't think a drop in for the 4066 exists. Look at 4016 too.
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Old 23rd November 2008, 04:08 PM   #3
jcx is offline jcx  United States
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"updated" 4066:

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1262

need to compare specs and application
sometimes "improvements" in specs for one app are wrong for another
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Old 24th November 2008, 01:04 PM   #4
Mooly is offline Mooly  United Kingdom
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The 4066 is basically a better spec 4016. Lower on resistance. As always, it depends on the application as to how well they perform.

What are they in. Not a Quad is it ?
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Old 24th November 2008, 02:27 PM   #5
405man is offline 405man  Scotland
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Yes they are in a Quad 66 preamp and I was wondering if there was something better

Stuart
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Old 25th November 2008, 06:53 AM   #6
Mooly is offline Mooly  United Kingdom
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Never seen the 66 ( Only the 44 etc ) circuit so can't really comment. Used correctly though the CMOS switches are pretty transparent to audio. The secret is configuring them so that no audio voltage is ever developed across the switch, which usually means using them in as part of a "virtual earth" opamp arrangement.
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Old 21st November 2009, 02:49 PM   #7
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I am thinking of subtitute the 4066 with TS3A44159 from analog Device etc. so that a better signal transfer is acheived across the switches as compared to 4066.Anyway I am totally new in this area so practical advise is needed.

Last edited by Mikewong; 21st November 2009 at 02:57 PM.
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Old 21st November 2009, 04:28 PM   #8
Mooly is offline Mooly  United Kingdom
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You might be better starting a new thread for this question.

Never heard of the IC you mention but as a general rule a lot depends on the exact application. If the switch can be arranged so that for example it works into a virtual earth amp then the effects of it are negligable as there is never any voltage developed across it.
I used discrete FET's to achieve the same result,
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Old 25th April 2015, 07:39 PM   #9
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You can replace it with a MAX4066 or MAX4066A.
I did it on a TEAC A-H 500i and the sound is a little bit better.
I replace also some capacitors and some resistors.

Last edited by lowlow007; 25th April 2015 at 07:41 PM.
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