Is Digikey marketplace no different from Aliexpress? - Page 1
Forum section: electronics / beginners

author: tchicago
author_rank: Regular Contributor
timestamp: June 25, 2024, 02:52:12 am
content: Does buying from Digikey marketplace have same risk of getting fakes as purchasing from Aliexpress?

author: coppercone2
author_rank: Super Contributor
timestamp: June 25, 2024, 03:01:50 am
content: at oceangate it is better. because the board room figured the chinese have more experience doing it right now

author: brucehoult
author_rank: Super Contributor
timestamp: June 25, 2024, 03:38:29 am
content: Quote from: tchicago on June 25, 2024, 02:52:12 amAliexpress has nothing to do with getting fakes. They are just like Amazon -- just taking orders for independent vendors.If you buy from reputable vendors on Aliexpress then the risk of fakes is zero. For example, I buy on Aliexpress from the official stores of WCH, Sipeed, Banana Pi and others.If you search Aliexpress by generic product and choose the lowest price then, yes, you may be at risk of fakes.

author: Teledog
author_rank: Regular Contributor
timestamp: June 25, 2024, 04:26:50 am
content: AliExpress takes a week or 3..may or may not be good parts (seehttps://youtu.be/pMjhJ9kcaU4@13:45 )Ordered parts from DigiKey last week (late night order) , ..needed 1W resistors (tube amp repair) they sent 1/4 Watt - from Winnipeg.I've found with Digikey, ..if one orders earlier in the day, it gets picked & shipped form Thief River Falls, USA. Never a problem.If you order later (from Canada) & it gets picked by, umm, from Winnipeg by, well, umm.... just don't expect to get your correct order.Happened several times, just sayin'..

author: brucehoult
author_rank: Super Contributor
timestamp: June 25, 2024, 04:39:46 am
content: Quote from: Teledog on June 25, 2024, 04:26:50 amAs it says right there in that video, the 4% of RGB LEDs (in that video) that work but don't have the correct colour balance are sold, but at much lower prices.You get what you pay for. If some vendor on Aliexpress has prices well below the majority of vendors for the same part -- ask yourself why that is before you order...

author: ArdWar
author_rank: Frequent Contributor
timestamp: June 25, 2024, 05:02:03 am
content: Quote from: Teledog on June 25, 2024, 04:26:50 amDid you order very low amount? Like 10pcs each or something?

author: Teledog
author_rank: Regular Contributor
timestamp: June 25, 2024, 10:38:54 pm
content: Quote from: ArdWar on June 25, 2024, 05:02:03 amOrdered 25..did the RMA thing. Replacements arrived this AM. Lo & behold..25 more 1/4W resistors!Looks like someone dumped 1/4 W resistors in the 1W resistor bin, ..and the parts pickers ain't engineers.RMA again/refund time & yes, ordering from Ali now.I can't imagine what this is costing them for couriers to ship 25 cents worth of resistors back & forth.

author: wraper
author_rank: Unknown
timestamp: June 25, 2024, 10:45:22 pm
content: Quote from: brucehoult on June 25, 2024, 03:38:29 amThe problem with Aliexpress and Alibaba is that "official" often is not official at all.

author: wraper
author_rank: Unknown
timestamp: June 25, 2024, 10:49:12 pm
content: Quote from: Teledog on June 25, 2024, 04:26:50 amDid you check the datasheet? Unless they came with different resistance, I'd first assume you just bought super miniature series and received a correct part.

author: wraper
author_rank: Unknown
timestamp: June 25, 2024, 10:59:53 pm
content: Yep, you just screwed digikey for nothing.

author: Teledog
author_rank: Regular Contributor
timestamp: June 25, 2024, 11:54:41 pm
content: Quote from: wraper on June 25, 2024, 10:59:53 pmCould be right! But they have an awfully glossy 1/4 W like finish, like every other 1/4 W I've seen.I would not trust anything that small pressed against a phenolic board to dissipate 1W continuously.

author: wraper
author_rank: Unknown
timestamp: June 25, 2024, 11:56:09 pm
content: Quote from: Teledog on June 25, 2024, 11:54:41 pmBecause they shouldn't if you actually want to dissipate 1W. Nor should be a larger resistor either. Note that in particular circuit large resistors could be used not due to power dissipation but due to maximum voltage rating.EDIT: Looks the samehttps://www.lcsc.com/product-detail/Through-Hole-Resistors_YAGEO-FMP100JR-52-1R_C914807.html

author: wraper
author_rank: Unknown
timestamp: June 26, 2024, 12:09:29 am
content: QuoteOut of regular resistors, only carbon film resistors usually come in somewhat similar color, and they have more brown tint. Also they have more pronounced features due to thin paint.

author: ArdWar
author_rank: Frequent Contributor
timestamp: June 26, 2024, 12:16:31 am
content: Quote from: Teledog on June 25, 2024, 10:38:54 pmWell they are indeednotengineers. Just warehouse staffs scanning SKU barcodes trying to match your order's packing list.Check your packing list part and mfg#, and do back search to see if it indeed match. And as usual, parametric values and part descriptions can be listed incorrectly. Mfg part number and datasheets still take precedence.From my experience, they sometimes drop the ball when order amount is very low, but that's usually minor inconvenience like frayed tapes, bent leads, etc. Not outright wrong SKU.Then again I always get my order shipped from thief river.

author: brucehoult
author_rank: Super Contributor
timestamp: June 26, 2024, 12:22:08 am
content: Quote from: wraper on June 25, 2024, 10:45:22 pmHow it is not official when the manufacturer's own web site has a "BUY" link to their Aliexpress store??e.g. first link onhttps://banana-pi.com/en/buy/

author: wraper
author_rank: Unknown
timestamp: June 26, 2024, 12:31:40 am
content: Quote from: brucehoult on June 26, 2024, 12:22:08 amDoes the wordoftenmean anything to you?

author: ArdWar
author_rank: Frequent Contributor
timestamp: June 26, 2024, 12:41:27 am
content: You really need to be vigilant with Chinese (and indeed most Asian) marketplace. There aren't really any enforcement with store names. Any random seller can pick any known brand and put any qualifier and it'll usually be fine until someone request a takedown.

author: brucehoult
author_rank: Super Contributor
timestamp: June 26, 2024, 12:56:00 am
content: Quote from: wraper on June 26, 2024, 12:31:40 amIt means to me that if you take the word of claims in random web sites and emails then you're a fool.All the Aliexpress examples I gave (and others I buy from) have links from the manufacturer's official web sites. So, no, if you do elementary research then it is not "often". Certainly it's never happened to me and I've never had any problems buying (with basic precautions) from Aliexpress vendors.

author: Teledog
author_rank: Regular Contributor
timestamp: June 26, 2024, 01:23:01 am
content: EEVblog has turned into nothing but a a b*tch-slapping forum.What happened?sad.

author: floobydust
author_rank: Super Contributor
timestamp: June 26, 2024, 01:39:55 am
content: Teledog, you have fallen into the "super-mini" power resistor trap as I call it. Manufacturers have lines that are physically quite small for their claimed power rating.1W examples: Yageo FMP100 (the worst), Stackpole ASMR1, KOA MFP1, TE RR01 etc. Then smaller are the Vishay SFR25S, 16S for 1/4W.I went down the rabbit hole in a couple EEVblog threads complaining about these and got beat up by some assholes who know-it-all that didn't know it all, about why these parts can exist and the noob traps they are.It's unfortunate. Here, you can't hammer out the knowledge, figure it out - instead it's personal attack over fucking resistors, soiling your "reputation" and a load of other garbage.I'd compared about 100 different ones for size, power. Ended up contacting Vishay and got the answers because nobody here knew shit. Myriad of complicated reasons but I did not share them, to waste less time fending off bitchslappin'https://www.eevblog.com/forum/beginners/resistor-sizes-vary-greatly/https://www.eevblog.com/forum/beginners/mfr0623-axial-resistors-are-only-14w-rated/

author: brucehoult
author_rank: Super Contributor
timestamp: June 26, 2024, 01:56:38 am
content: Quote from: Teledog on June 26, 2024, 01:23:01 amApologies. I get tired of sour people with a consistently negative, if not insulting, attitude to almost everything and everyone.Recent other example, one of many:https://www.eevblog.com/forum/manufacture/reballing-a-bga-intel-hx-chipset/msg5552525/#msg5552525

author: wraper
author_rank: Unknown
timestamp: June 26, 2024, 06:35:52 am
content: Quote from: brucehoult on June 26, 2024, 12:56:00 amI said literally nothing about your examples. Even if all of them are telling the truth, it does not mean that most of the others are. It's like saying: I got hit by mains voltage multiple times and nothing serious happened to me, therefore its safe to tinker with it and arguments against that are stupid.

author: wraper
author_rank: Unknown
timestamp: June 26, 2024, 06:48:23 am
content: Quote from: brucehoult on June 26, 2024, 01:56:38 amSociety is so stupid these days that not outright agreeing with you and asking more questions somehow became insulting and hurting your feelings, and it's OK to freak out and whine about that.

author: tooki
author_rank: Super Contributor
timestamp: June 26, 2024, 06:49:05 am
content: Quote from: tchicago on June 25, 2024, 02:52:12 amRealistically, Digikey claims their marketplace vendors are vetted, and given Digikey’s track record for excellence, I see no reason to doubt them about it.With that said, it’s easy enough to select the “exclude marketplace” checkbox.(I do wish DK had a way to set default filter settings. I would set “in stock”, “exclude marketplace”, exclude obsolete items, and set the maximum number of results, for example.)

author: LinuxHata
author_rank: Frequent Contributor
timestamp: June 28, 2024, 08:03:01 am
content: I shifted from digikey to LCSCDigikey asks too much questions about the parts you're buying.You have to fill in a lot of forms, like you're buying a firearm.I would accept that if these were some specific components, which can be used in military or questionable areas.But recently I needed current sense resistors and switching power supply (LOF750). They cancelled my order because information I provided "was not enough"So I gave up and ordered them elsewhere.

author: jfiresto
author_rank: Frequent Contributor
timestamp: June 28, 2024, 12:15:59 pm
content: I did an an image search on "Yageo FMP100". Looking at the photos, I could confuse them with 1/4W resistors.Have you tested them at, say, 3/4W: to see how hot they get – or for how long?

author: wraper
author_rank: Unknown
timestamp: June 28, 2024, 12:21:54 pm
content: Quote from: jfiresto on June 28, 2024, 12:15:59 pmThey will get just as hot as 1/4W resistors, maybe a tiny bit cooler if their surface is somewhat better at IR radiation. The major difference is in temperature they can survive. In any case the suspicion they're 1/4W is absolutely nonsensical and is not based on anything other than initial confusion due to their size and not reading documentation. Heck, he could just looked on dimension spec on digikey product page.

author: jfiresto
author_rank: Frequent Contributor
timestamp: June 28, 2024, 12:26:16 pm
content: Could you self-heat one for a while and then check the resistance change?

author: wraper
author_rank: Unknown
timestamp: June 28, 2024, 12:27:35 pm
content: Quote from: jfiresto on June 28, 2024, 12:26:16 pmWhy bother with this nonsense.To confirm that 1W resistors in this size do exist and it's not a conspiracy, or what?

author: wraper
author_rank: Unknown
timestamp: June 28, 2024, 12:30:14 pm
content: Quote from: LinuxHata on June 28, 2024, 08:03:01 amMost likely they cancelled PSU order because Mornsun was put in US sanction list.

author: jfiresto
author_rank: Frequent Contributor
timestamp: June 28, 2024, 12:50:25 pm
content: Quote from: wraper on June 28, 2024, 12:27:35 pmI may be old fashioned, but first I would want to test more favorable explanations that would result or eventually result in a pile of 1W resistors I need not wonder about.

author: wraper
author_rank: Unknown
timestamp: June 28, 2024, 01:10:14 pm
content: Quote from: jfiresto on June 28, 2024, 12:50:25 pmHe got delivered exactly what he ordered but screwed Digikey two times and wasted his own time as well for a lack of better judgment to verify what he actually ordered. The only reason for this drama is not knowing the same power rating comes in different sizes. Should you use this resistor close to it's max rating? Nope, unless you really must as there is less headroom in these that run real hot compared to larger ones.

author: tooki
author_rank: Super Contributor
timestamp: June 28, 2024, 02:27:19 pm
content: Quote from: Teledog on June 25, 2024, 04:26:50 amGiven that DK only has one warehouse location for the entire world (their HQ in Thief River Falls), the chance that your orders get picked from a Canadian warehouse are somewhere between zero, nothing, nada, and zilch. (DigiKey doesn’t even have a sales office in Canada.)What you’re probably seeing is some logistics quirk whereby some orders are somehow routed in bulk to Canada (i.e. already boxed and labeled) and then distributed there. Thief River Falls is closer to Canada — and specifically, Winnipeg — than it is to any major US city (the closest being Minneapolis).