| General > General Technical Chat |
| i won't buy chinise parts from aliexpress or ebay |
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| wraper:
Also once AD8293G160 was out of stock everywhere and I needed them urgently. Ordered few hundred from aliexpress at the price which was even higher than from distro. They were new and genuine but defect rate was like 20-25% with various issues, especially at one end of the tape where it was worse than 50%. I suspect it was some serious ESD. It was not popcorning due to moisture since they were bad even with hand soldering. |
| asmi:
--- Quote from: blueskull on September 03, 2020, 02:36:00 pm ---Amazing. That's all I can say. So it seems sellers do tend to sell fake parts knowing you can't return them economically --- End quote --- I once got incorrect chip (wrong P/N) on Aliexpress, and through dispute demanded refund without return because the latter is not economical, Aliexpress agreed with me and refunded the full amount. |
| wraper:
--- Quote from: blueskull on September 03, 2020, 02:36:00 pm --- --- Quote from: wraper on September 03, 2020, 02:30:29 pm ---I received relabeled nvidia GPUs, one part number sold as another. Same silicon physically but config is not. Got one Toshiba stepper driver relabeled as another. Found out by measuring pins, if I didn't do so, I would have explosion and probably burnt traces in my device. Got relabeled UV EPROMs, 25V part relabeled as 12.5V. Got mix of attiny24 and 24A blacktopped and relabeled as 24A with a fresh date code, terminals soldered like shit. Those were not insanely cheap. The same or a bit lower price than you would expect from Mouser or similar at qty of 100-1000. --- End quote --- Amazing. That's all I can say. So it seems sellers do tend to sell fake parts knowing you can't return them economically, which I never had to encounter. I mean I did buy from China when I was in the US, but I use the same Taobao and I never got duds, probably due to less language barrier and the seller knowing I have connections in China that can return the goods or even dispute him. --- End quote --- If you find out in time. Those attiny were made quite convincing. Unfortunately I did not compare of date/lot code on top and bottom as they should match (they did not). Found out only during testing after they were placed on 100-ish of boards. More than half of the boards consumed like 2mA more than normal, other consumed as they should. When I checked date code on the backside, it became clear that those which consumed more were made before 24A was even released. Stepper drivers sat in my drawer a few years before I decided to actually use them. |
| bd139:
--- Quote from: asmi on September 03, 2020, 04:34:57 pm --- --- Quote from: blueskull on September 03, 2020, 02:36:00 pm ---Amazing. That's all I can say. So it seems sellers do tend to sell fake parts knowing you can't return them economically --- End quote --- I once got incorrect chip (wrong P/N) on Aliexpress, and through dispute demanded refund without return because the latter is not economical, Aliexpress agreed with me and refunded the full amount. --- End quote --- Yeah same here. I’ve had broken stuff and fake stuff and aliexpress always sides with the buyer if you get them involved. |
| PlainName:
--- Quote ---with banana skins in the gearbox and differential to keep them quiet --- End quote --- One learns something new every day! :-+ |
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