I use a 15A 45V 15SQ045 diode for some low voltage application in solar. Just got some 20SQ050 to evaluate (they were free). Both are made by PSC. As a general rule I figure the higher you go in rated voltage, the higher the forward voltage would be. I tested both diodes in series with thermal breaks to prevent heating effects. The 15A diodes at 7A were about 0.304V and the 20A diodes were about 0.354V. A little higher difference than I would have expected, but thought a voltage breakdown test might explain that. The leakage test was done at room temperature. The 15A 45V diodes had 1ma of leakage between 57 and 61V with the majority being 60V or above. The 20A 50V diodes were between 54 and 63V with the majority being 60V or below. I though, lets heat them up with 7A for a while. The 15A 45V diodes had 1ma of leakage hot between 55 and 60V. The 20A 50V diodes hot were between 35V and 44V.
Why would anyone select these 20A diodes. Is this just marketing hype or are they fake. The data doesn't make any sense to me. The 20A diode meets spec, the 45V just seems to do a lot better.
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