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I quite often find that digikey or element14 have quite expensive pricing for the parts, right now I'm looking for memory chips and compare it to ebay sellsers:

http://www.digikey.com/product-detail/en/W25Q80BVSSIG/W25Q80BVSSIG-ND/2202664

http://www.ebay.com/itm/10Pcs-W25Q80BVSSIG-SOP-8-SPI-W25Q80B-Original-SMD-FLASH-Memory-/181471914814?pt=LH_DefaultDomain_0&hash=item2a4091ab3e

And this is not the only case, I've seen ridiculously expensive(like double or triple price) chips on element14.

I understand that on ebay you can get counterfeit parts, but it is so rare, all parts I get are good ones. So the question is why should one use digikey or element14 sites? It is said everywhere that it's better to buy there, but why would I want to buy a chips for 4x price(above example)??? I'm not trying to be aggressive against these sites, just don't get the reason of buying there.

ScienceSamovar
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2 Answers2

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The main advantage ordering from Digi-Key, Mouser, Element-14, Future Electronics etc. is convenience and selection. If you have a particular part you need, one of these will usually have it, or it's not going to be in stock anywhere. Generally a part will be available in several different package styles and temperature ranges.

On eBay and other auction sites, its going to a hit or miss situation. Generally only the more popular parts are going to be available, and in a limited number of packages and temperature range.

With any of the major distributors, you have the ability to do a parametric search based on the specifications of the kind of device you are looking for, so you can compare different parts and costs. You won't be able to search for much more than the part number on the auction sites.

The biggest disadvantage ordering through eBay is shipping time. On the page you linked to, it is 11-20 days for the US, and 15-30 days for Europe. With the major distributors, you can usually order parts as late as 9:00 Eastern time and get them the next day (for a hefty price). This is important sometimes during development on a tight schedule. If you can wait a few days, you can get parts via Priority Mail for a fixed price of around $6 -- obviously still a lot more than the free shipping offered by the Chinese sites.

Another advantage to buying from Digi-Key etc. is that you can easily order several different kinds of parts easily, while on the auction sites you would have to make several different transactions.

Both the distributors and the auction sites generally allow returns, within 14 days or so.

But -- as you point out, the auction sites can be much cheaper. So if you are only ordering a few different types of parts, can find exactly what you want on the auction sites, and can wait a couple of weeks or so for them to arrive, maybe that is the smartest way to go.

Most companies that have gone into production and are having their PCB's assembled in China buy their parts directly over there, much cheaper than they can get them anywhere in the US (even direct from the manufacturer).

tcrosley
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  • Thanks! Exhaustive answer :) One tiny questions - from your experience how long does it take for parts to arrive with Priority Mail 6$ shipping? And how much is this "hefty price" for next-day delivery? I suppose it something astronomical like 80-100$ for small package, no? – ScienceSamovar Sep 08 '14 at 05:51
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    @ScienceSamovar Priority Mail is generally advertised as being 2-3 days delivery, but in my experience it has always been two days. I think the latter is when you are located a long ways (like a hundred miles) from a major city. Fedex and UPS overnight are generally between $40-$60 depending on the distributor and when you need it: first thing in the morning (by 8 AM), mid-morning, or mid-afternoon. USPS Priority Express is cheaper, around $25, but you have to order earlier in the day. Fedex and UPS 2-day are generally $15 to $25, so it is better to use USPS Priority Mail if it is available. – tcrosley Sep 08 '14 at 06:10
  • Once you have an established relationship with element14 they will happily give you column 2 or 3 prices on even quite small quantities. You don't ask, you don't get. – user207421 Sep 08 '14 at 08:28
  • Here in Australia you get free next day shipping on orders over $45 or a flat $14 otherwise. – Hugoagogo Sep 08 '14 at 12:18
  • I have a small question. Are all companies(90-95%) that manufacture components are listed in digikey, mouser or just the big companies are listed there?? Why I'm asking this is because if I search for a part from digikey or mouser, at the end of the day if I didn't get a part with my spec, can I end my search there(thinking of it as the only place)? What is your thought on this? – seetharaman Mar 12 '16 at 18:05
  • @tcrosley: Could you tell me the Chinese sites for purchasing electronics parts? – Second Person Shooter Apr 29 '20 at 07:19
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One other advantage of buying through a big distributor instead of ebay is that you are less likely to get counterfeit parts.

For some components, there are a lot of counterfeits - they may be completely different chips, or parts with slightly worse specs, or parts that failed quality control. Sparkfun has a decent writeup of some fake ATmega328s they got stuck with after buying from a new vendor.

Of course, distributors can get cheated and end up with bad parts too, but since they need to maintain a good reputation they generally handle dealing with those cases better than a random seller on ebay who knowingly or not sells counterfeits.

Grant
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