- Jan 1, 1970
Perhaps using a different device would be a more optimal solution,
particularly for the higher voltages experienced.
Where I worked previously, we designed an automatic test jig that
utilised NAIS AQW212A PhotoMOS devices, and they worked very well.
That series had devices that worked up to 600V @ 40mA load current.
The last price I obtained from Mouser (early 2006) was roughly US$2 each
for the '212A's.
This board already has 48 (!) SSRs in the channel switching paths, not
to mention 9 real relays for the BIST switching. But a 6:1 mux with
ssr's would take more room and more port pins than I have.
We're using a Claire (alternate NEC) part that's about 85 cents in
I agree, ssr's are very handy, even in situations where "relay" is an
improbable choice. Think of them as isolated-base transistors.