analog switches (other than the cd40xx series)

[Brian Marshall]

I am working on a little project that requires an analog switch.  It is possible that i could use jfets, but in the past I have found jfets are not overly linear, and sometimes hard to make them turn all the way off.  Ofcourse then there is the issue of consistancy.

Anyways, currently I have a cd4066 on my bread board, but I have two main reasons for not wanting to use it.. 

1.  I am only using one switch, and would prefer something smaller, 8pin IC maximum.
2.  Other parts of the circuit require 18 volts, and i believe the cd40xx series ic's are only 15v rated.

I dug out my mouser catalog and found the DG417/dg418 series from vishay.  Anyone have any experience with them, or suggestions.
True linearity is not needed, because it is not switching audio, but something close to it would be nice.  The main problem i see with the dg417/418 IC's is that they appear to require a bipolar supply...

[bioroids]

Have you tried bipolar transistors (as shunt switch) or maybe a mosfet instead of a jfet. I dont know how linear can this work anyway.

Luck!

Miguel

[Nasse]

Diodes can be used if it is for low voltage signal and distortion is not a problem, DC control. For sure they are cheap and repeatible. Getting much dB´s attenuation and reasonable high level signal needs is not that simple

[Brian Marshall]

Diodes can be used if it is for low voltage signal and distortion is not a problem, DC control. For sure they are cheap and repeatible. Getting much dB´s attenuation and reasonable high level signal needs is not that simple

I am actually already using some diodes in this circuit.  I have tried BS170 mosfets.  It sort of works, but doesnt seem to have the headroom I am looking for.  bipolars are too leaky... fyi ist basically a random sample hold circuit.