CD4066 Switch replacement

405man · 23rd November 2008, 10:35 AM

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

Stuart

Conrad Hoffman · 23rd November 2008, 12:21 PM

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.

jcx · 23rd November 2008, 04:08 PM

"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

Mooly · 24th November 2008, 01:04 PM

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 ?

405man · 24th November 2008, 02:27 PM

Yes they are in a Quad 66 preamp and I was wondering if there was something better

Stuart

Mooly · 25th November 2008, 06:53 AM

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.

Mikewong · 02:57 PM

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.

Mooly · 21st November 2009, 04:28 PM

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,

23rd November 2008, 10:35 AM	#1
405man diyAudio Member Join Date: Dec 2003 Location: Near Glasgow Scotland	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

23rd November 2008, 12:21 PM	#2
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	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. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

21st November 2009, 02:49 PM	#7
Mikewong diyAudio Member Join Date: Apr 2003 Location: Milan	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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23rd November 2008, 04:08 PM	#3
jcx diyAudio Member Join Date: Feb 2003 Location: ..	"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

24th November 2008, 01:04 PM	#4
Mooly diyAudio Member Join Date: Sep 2007	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 ?

24th November 2008, 02:27 PM	#5
405man diyAudio Member Join Date: Dec 2003 Location: Near Glasgow Scotland	Yes they are in a Quad 66 preamp and I was wondering if there was something better Stuart

25th November 2008, 06:53 AM	#6
Mooly diyAudio Member Join Date: Sep 2007	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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