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Just as an update on this so there's no need to go on arguing further: I ended up putting together a 6S4P load of these 1N5407's (should be about 2X over-built based on specs). At first I was messing around with binning/matching Vf for each parallel group, but I lost interesting and didn't even...

OK, I can do some matching. Do you know, if the voltage drop matches between two diodes at a low current, is that likely to indicate they will still match at higher currents? In other words, if I match diodes very closely by my multimeter's Vf diode function at 1mA, will they still be matched...

Well they are rated 3A each, that's why I was thinking of doing them 6S2P (2 in parallel for each series stage), or is that a bad idea? I can do more in parallel if needed, I have hundreds of them...

Hello, I'm in the same situation as the OP: 8A driver, same diode, and same application(CNC). I happen to have a ton of 1N5407 diodes, would these be suitable to simulate the NUBM47? These seem to have a drop of ~0.85-0.9V at 2.5A so I'm thinking a 6S2P configuration would be able to...