Electronics > Beginners
What are good diodes to get?
lordvader88:
What are the most recommended diodes to have on hand ? I'm nearly out of general purpose rectifiers, and signal diodes, and zeners, and LEDs too.
And how good/bad are cheap ebay diodes vs buying brand name, diodes ?
I have lots of 1N60 Germanium diodes, some varactor diodes.
What all precision diodes are there ?
my short list is some
1N4148
1N400x
1N54xx
higher wattage zeners than the 1/8 or 1/4W ones I have, but they are hard to find on ebay and expensive
What are some high current rectifiers for mains powered projects/repairs
I barely have any fast switching diodes, for SMPS.
Whats are some state of the art diodes ?? And RF diodes ?
bd139:
1n4148 for 99% of stuff. 1n5711 for RF bits, mostly power detection for me. 1N4007 for low current rectifier
Everything else I buy when I need it. There's not a lot that can't be done with the above that isn't expensive to keep in stock.
mariush:
Go to a store like Digikey and sort by quantity in stock - chances are whatever's stocked in bigger quantity is more popular. ex see https://www.digikey.com/short/p4dwnz
Look into some fast/ultrafast rectifiers (UF**), schottky diodes, maybe stock some bridge rectifiers in DIP package or SIP (gbu family and others) instead of using 4 diodes to rectify ac voltage
look into max current and also forward voltage drop at some current... ex. 1n4007 may be good for up to 1A as long as you're fine with 0.8v..1v voltage drop at even 200mA but maybe you'll also want a 1A diode that has only 0.3..0.5v drop at 100-300mA
May want to have some 3A..5A diodes in stock even if you're gonna use them in 0.5A..1A circuits, simply because at 0.5A..1A the voltage drop will be very small and the diode's properties won't change as much with heat (bigger package, thermal mass etc)
bob91343:
I have thousands of 1N4148s so I will never have to buy any. I have a large stock of 1N4007s so those are good.
Anything else, well I try to get germanium diodes like 1N270 to keep handy. And zener diodes are a different issue.
From salvaging parts of obsolete or broken stuff I have amassed lots of LEDs, and rectifiers of the two and three or four in a package, some capable of several amperes. There are some high voltage diodes too, many with high current ratings.
For varicaps I have found that ordinary diodes will behave well. I measure on my bridge while adjusting reverse bias. For temperature compensation of power amplifiers, again ordinary diodes do well, especially 1N4148. Sometimes I need a few in series and of course attached to the heat sink.
David Hess:
These days I tend to use fast recovery rectifiers in place of standard recovery parts like the ubiquitous 1N4001 series simply so that I can stock fewer parts. I also tend to only buy the highest voltage part of a given series for the same reason.
So for instance the 200 nanosecond 1N4937 replaces the 1N4001 through 1N4005 standard recovery rectifiers.
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