EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: ratdude747 on September 13, 2016, 02:00:46 am
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Here's a real winner; Fry's selection of diodes. They have every NTE diode pack known to man... but no freaking 1N4001's!
It's like the most jellybean of jellybean diodes. I was just looking for two for a little project (my part stash is at my parents' house still)... but no.
The staff was no help... "diode applications are like obsolete"... Yeah... :-DD Without diodes your phone wouldn't charge and your computer wouldn't have a PSU. ::)
Looks like I'll be raiding the part stash the next time I'm over... At least Fry's had automotive style relays (with screw-tabs for mounting); the project is recreating a missing relay harness to a HID light kit that I bought for cheap (5000K, all new, $25 at Goodwill) and the diodes are used on the control side of the relay. For those who are curious, I've attached a copy of my crappy schematic I sketched (because I was too lazy to KiCAD it).
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So far it looks like a lot of manufacturers are making 1N4001 so unlikely obsolete anytime soon. But other thru hole parts are rapidly going obsolete. Many common TO-92 transistors in particular seem to have been particularly hard hit. Not too big of a deal for new designs but a pretty significant problem for repairing older products.
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I would imagine they are making 1n4007 and 1n4003's and binning components accordingly, a poor 4003 still meets or exceeds a 4001,
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Are they saying "specifically" 1N4001"s or does it include 1N4004s, 1N4007s etc ? both of which are better replacements. I just buy 4007s for everything.
What about 1.5A etc? If it is only 4001s, good riddance I say :-) Never understood why they had several Vrevs, when a single 1000V did it all.
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Does it matter? A 1N4937 won't work for you? Or a 1N4006 or 7?
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Are they saying "specifically" 1N4001"s or does it include 1N4004s, 1N4007s etc ? both of which are better replacements. I just buy 4007s for everything.
What about 1.5A etc? If it is only 4001s, good riddance I say :-) Never understood why they had several Vrevs, when a single 1000V did it all.
I suspect this comes from the days when avalanche conditions were different for each wafer and whatever they began to conduct at in reverse bias, that was what they were badged as.
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Unless you're really relying on the 50V avalanche (which is absolutely not guaranteed), why not just use a 1N4007?
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Are they saying "specifically" 1N4001"s or does it include 1N4004s, 1N4007s etc ? both of which are better replacements. I just buy 4007s for everything.
What about 1.5A etc? If it is only 4001s, good riddance I say :-) Never understood why they had several Vrevs, when a single 1000V did it all.
The whole 1n400x series was missing it seemed. Going back to some of my old project schematics I did the same and forgot about it. I know, sad, but in my current job I don't really work at a component level. A lot of this old part number specific knowledge has gone to mush more or less. Not to say I don't like my job; its engineering, just not electronics engineering. That's why I have hobbies.
Does it matter? A 1N4937 won't work for you? Or a 1N4006 or 7?
Unless you're really relying on the 50V avalanche (which is absolutely not guaranteed), why not just use a 1N4007?
No, any of those would have worked. The other beef I had was the piss poor layout. It was all organized by part number... while the bridge rectifiers were in one area , pretty much all the diodes were on a wall without any markings. I figured out that there was one block of zeners... but the rest was a mess.
Aside from the 1N400x series and ones like the 4148 I haven't really used any other non-zener diodes in projects... never had a need.
I guess this is why digikey and the like stay in business... :palm:
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Fry's wouldn't be my criteria what is obsolete. Or any of their staf for that matter...
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AFAIK the bigger ones have higher junction capacitance and are painfully slow but then again if you are having this problem you should probably pick a different diode series altogether.
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The 1N4001 to 4004 are usually the same, just increasing break down voltage. The 1N4005-4007 can be a slightly different design (kind of PIN Diode) and can have a slightly high forward voltage and lower capacitance and maybe even slower turn off times. They are slow (reverse recovery) anyway.
At least some manufacturers seem to plan to make them obsolete and mark it as not recommended for new designs:
http://www.diodes.com/_files/datasheets/ds28002.pdf (http://www.diodes.com/_files/datasheets/ds28002.pdf)
But there are usually plenty replacement types (at least for normal use) and quite a lot of manufacturers. So there will be one left for quite some time.
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Fry's wouldn't be my criteria what is obsolete. Or any of their staf for that matter...
That was the joke...
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I heard that all 1N4001's were going to be replaced by a signal processor on a FPGA...
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I heard that all 1N4001's were going to be replaced by a signal processor on a FPGA...
Active diode equivalent simulating unit. I think Maxim makes that.. Oh.. out of stock.. sorry.