Possible good SiGe diode substitute for Ge diodes

[darwin999]

FYI - I ran across a silicon-germanium (SiGe) SMD diode from Nexperia, whose forward voltage is similar to a higher Vf germanium diode - which looks like what you'd want in a Cornish G-2, etc. And it's reverse characteristics are excellent, it only conducts ~50pA at 25V reverse bias (i.e., reverse resistance >500GΩ !). The part number is PMEG150G10ELRX, and here's the forward and reverse characteristics from the datasheet.



The only bad news is that it's going out of production, LOL...
Mouser sells it, they still have ~3000 in stock.
I have some on order right now to try out - the full datasheet is attached.
And presumably some other vendors may still have some in stock (I didn't check, though).

 

[darwin999]

Another SiGe diode from Nexperia is the PMEG200G20ELRX, similar characteristics but 2 amp diode.

When my PMEG150G10ELRX diodes arrive, I'll try to remember to measure them and post the I-V curves here.

 

[jwin615]

I've wondered over a few of this hybrid diode datasheets and wondered.
But the seem to be large signal/high voltage devices
Curious how they behave on a small signal scale.