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i won't buy chinise parts from aliexpress or ebay
cmrincon:
--- Quote from: exe on February 11, 2020, 11:55:10 am ---What was motivation to buy such a jelly bean component from China?
--- End quote ---
Sometimes i'm bored and i buy things that i really don't need, but i think that they will be useful in the future, they cost only a few euros and i think that it is like a little adiction.
When i buy a part from ebay/ali i will never expect to have parts with the exact behaivor than the original one, but at least i expect that they would have similar specs as i'm not a proffesinal and this is only my hobby. Maybe this are only a few bad experiences in a short period of time.
--- Quote from: Marco on February 11, 2020, 07:03:36 pm ---Breadboarding with them is silly, use parts with proper gate protection.
--- End quote ---
Do you have any mosfet suggestion? i'm searching for a mosfet with a low input/output capacitance (100p-200p max) and a max power dissipation of 1 w
exe:
--- Quote from: cmrincon on February 11, 2020, 09:36:00 pm ---Do you have any mosfet suggestion? i'm searching for a mosfet with a low input/output capacitance (100p-200p max) and a max power dissipation of 1 w
--- End quote ---
Well, I do :) Tune search to your liking https://www.digikey.nl/products/en/discrete-semiconductor-products/transistors-fets-mosfets-single/278?k=&pkeyword=&sv=0&pv1174=121220&pv1174=121231&pv1174=121242&pv1174=121250&sf=1&FV=-8%7C278%2Cmu200pF%7C2263%7C1&quantity=&ColumnSort=0&page=1&nstock=1&pageSize=25
Psi:
The problem people run into with aliexpess is ordering by price and buying the cheapest option, because they are so used to doing that on other sites.
The correct thing to do is order by price and then look for the different price groupings. They will be in clusters.
The lowest price grouping should be ignored at all costs. This is where you will find total fakes and factory rejects that are way out of spec.
The 2nd and 3rd price grouping is what you want to order. These will be good parts.
NOTE1: Even 2nd and 3rd group may still be factory rejects but will be good enough 99% of the time. If you want 100% good and in spec parts your buying from the wrong place. Aliexpress is not for that.
Aliexpress is for when you don't mind a little risk in order to save 50-90% of the cost from a genuine supplier. Expecting 100% genuine pars at 50-10% price is stupid.
NOTE2: Never buy from an Aliexpress seller with less than 95% feedback score.
NOTE3: Pick your battles, if you're building something first decide what parts are critical to you and what parts don't matter much.
You might choose to get your transistors and IC's from digikey but get your LEDs, resistors and switches from aliexpress because those are less critical. If the LED brightness is a little off it wont matter.
wraper:
--- Quote from: Psi on February 11, 2020, 09:55:21 pm ---The 2nd and 3rd price grouping is what you want to order. These will be good parts.
--- End quote ---
99% good is gross overestimation. Depending on what you buy they easily may be the same crap as the cheapest tier.
floobydust:
If you buy the lowest price parts from a store that also sells pantyhose and cosmetics, well- it might be high risk.
Some eBay/Ali stores are a bit more expensive and sell OK parts but never in anti-stat packaging or with real markings. There seems to be a mystery laser doing all IC/transistor markings in china.
Lately I just buy from Digikey or Mouser. Because it is false savings after the wasted time pissing around with fake/dud/counterfeit parts.
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