discrete JFETs vs CMOS analog switch

That's not a small-signal (lateral) MOSFET--it's a vertical power FET, albeit small.

Cheers

Phil Hobbs

Yes. But you asked where they are available, so I answered.

CH

They did, BSS83, now discontinued. You might still be able to get the SST213. Also for some uses, the (4000-series CMOS chip) 4007 has MOSFETs with various terminals brought out, is widely stocked, but poorly specified for analog use.

Here is a MOSFET with 4 terminals... The substrate has its own pin. BSS83 Datasheet

PIN diode switch ?

In a similar situation, I used reed switches in the series branch, because of their low open inter-contact capacitance. (Pickering series 103 SPST, 70fF.) For the shunt branch, I found the series inductance of a reed switch intolerable, so there I used BAR88 PIN diodes with a lot of forward current, because they don't otherwise work for such low frequencies.

Jeroen Belleman

The cute little Fujitsu FTR DPDT relays are cheap and good to about 3 GHz.

I've used Omron GSK-2G-Y, similar to the one you have there. Do the Fujitsu relays survive being washed?

Jeroen Belleman

We have learned to not water-wash them.

We have two wash systems, one water and one "vapor degreaser" which is actually a dunk in boiling solvent followed by spray-down. They are happy with that process.

We used the Omrons once but don't any more for some reason.