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| ? about diodes |
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| Dennis FK:
I'm starting to run out of 1N4007 diodes efter 30 years, so I bought some from china.... The china diode are 2.3mm roundand the leads are only 0.45mm (compaired to my 30 years old witch is 3mm round and the legs are 0.8 ) They seems very flimsy, but I have no idear if "original" diodes are that small? |
| Zeyneb:
I don't know what officially should be it. But I recently bought from Digikey 1N4007GDICT-ND. I measured these right now. The body OD is 2.66mm and the leads are 0.81mm in diameter. |
| T3sl4co1l:
DO-41 and other ancient JEDEC packages are quite loose in their dimensions. Though 0.45mm is out of spec. It might be actually a plastic version DO-35 or the like. Or just straight up cheaped out. I certainly wouldn't run them at full current. Mind, I'd also be suspicious enough to test them for voltage (if you apply a low current i.e. <1mA, they should avalanche stably, getting quite hot in the process but not failing outright -- if you don't have a 2kV+ DC supply, just turning up the (AC) voltage somewhat past what you need for a given application, and checking for reverse current or excess heating, should be good enough. They will most likely cook off shorted if you go too far, use a fuse and it's fine. Tim P.S. Consider more descriptive titles in the future, like this one. A "?" about diodes could be anything and no one has any way to guess until they click on it. |
| Dennis FK:
Hi. Iøll do that in the future :) |
| gamalot:
I have some cheap unknown brands 1N4007 from China, the OD of body is 2.4mm, which is OK. The leads are 0.5mm in diameter which is a lot thinner than what those big names say in their datasheets. That wouldn't be a big deal, I wouldn't put 1 amp through them - that would mean 1 watt of power dissipated and a 100-degree temperature rise! |
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