On Fri, 7 Apr 2017 01:06:17 -0400, you wrote: >Another thing to watch out for if you need very low leakage, is if the >package is transparent. All junctions are photodiodes. > >Maybe it's less of a problem now with SMTs, than it was with glass body >diodes or translucent transistor packages. > >Andy
I got caught by this once. We had a design which had to use hermetic parts and this happened with the diodes used for input protection during development and testing. Luckily I noticed within a few minutes that the apparent drift coincided with the angle that I was observing the circuit leading to the discovery that my desk lamp was controlling the offset voltage. We ended up painting the diodes black after soldering. I have also heard of it happening with metal TO-18 packages through the lead interface under the package. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
