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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
weLL,
--first, itll be high current you can be sure of that.
--second, youcan measure the V drop at the curretns of interest.
--third, you can figure out its polarity.
--Fourth, as for reverse V rating, your kinda screwed... unless you kniow what it came out of, or have multiple diodes you can spare, thus destructivly figuring it out.
well im drunk rIght know so donttake any of this seriously till others back me on it.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Judging by looks alone can be problematic with most semiconductors.
I had a whole series of stud type diodes, they were all the same to look at, but had very diffeent specs. The case can be exactly the same for multiple device types. without the part numbers, your kinda screwed.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Patrick's post under the influence gets 3 out of 4. You're not entirely screwed for reverse voltage. Diodes will tend to avalanche when their reverse rating is exceeded, and most will avalanche without damage if you can limit the dissipation. Use a big series resistor to limit the current as you increase the reverse voltage and monitor the uA leakage current. Some might die on you straight, but hey, you didn't want to use anything that fragile anyway did you?
You might have a stab at the reverse voltage from measuring the forward drop, how many silicon PN junctions are there in series? If 0.7v (ish), there's only one, so it's not going to exceed 1000v, or if it does, not by much, and could easily be way less. If 1.4v or more, then there's several junctions in series to raise the reverse voltage to several 1000 or more. But looking at that package, I doubt it.
Registered Member #816
Joined: Sun Jun 03 2007, 07:29PM
Location:
Posts: 156
I would have taken a guess that its relatively low voltage, high voltage at high current would be quite a specialist part, so you might expect to see a maker’s brand name then. Possible applications could be from a welder, industrial battery charging, or dc motor drive.
You could compare the stud size and diameter of the hexagon; with other large stud diodes you can find data on to get you into the ballpark, for its current rating. Voltage is more difficult to determine, I’d place my bets in the 150v – 400v range.
But Dr slack’s method above is a good way to carefully test it, it’s normal rated voltage will be a lot less than where it begins to break down, for reliability reasons of course.
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diode identification help
