Hello,

I really appreciate Taydae Electronics, but they don't carry some parts I need. Would anyone be able to recommend a similar parts supplier?
(I know about mouser, jameco, digikey, etc.), Is alliexpress any good?

Sincere thanks,
TonyAm

 

Is alliexpress any good?

It depends.

If you're experienced and know how to test components and troubleshoot circuits, it could be worth taking a chance on AliExpress (or Amazon, eBay, etc).

If you're inexperienced, you should stick with reliable distributors to save yourself some grief.


While I rarely buy significant dollar amounts of individual components from AliExpress, I will do it buy some when the prices from reputable sources are more than I want to pay. For example, I wanted to start using power MOSFETs, but balked at paying almost $1 each (qty 10) for IRFZ44N, so I bought some on AliExpress for about $0.15 each (qty 10). Naturally they came packaged improperly and I had test 100% of them (50) for excessively high gate leakage (sign of ESD damage) and functionality. I tested them at about 6A and measured ON resistance.

I had intended to buy IRLZ44N, so bought them at $0.20 each. They came packaged improperly (plastic bags again), so I had to test 100% of them (60 this time).

I wondered about the threshold voltage difference, so I designed a circuit to measure it. IRFZ44N were supposed to be 2-4V and IRLZ44N were supposed to be 1-2V. What I found was that all of them had a threshold voltage less than 2V.

Wanted some P MOSFETs to complement the N MOSFETs, so I bought some IRF4905 and IRF9540. Same thing. They came packaged improperly and I had to do 100% testing.

Since I know their origins, I won't treat them as authentic parts.

 

yp... buyers beware. if you are not comfortable testing/troubleshooting/fixing things, stick with reputable suppliers. if you are have specific parts that you are having hard time finding, list them and let other help you. i buy things on AliExpress mostly for experimenting and entertainment value. but if it is going into commercial project, i don't waste time... i need good parts from known sources that can be reordered any time.

 

Thanks very much for the info, appreciated.

 

Try Futurlec.

https://www.futurlec.com/

 

....and I had to do 100% testing.

The story isn't complete without revealing how many if any failed.

 

Forgot about Futurlec, thank you.

 

What type of products are you looking for? Boards, modules etc. or components like IC and transistors?

 

I am looking for a PCB mounted 9V battery holder like this one; https://www.mouser.com/ProductDetail/12BH616P-GR
It has the two vertical leads (pins) in the back for soldering to PCB, for under $1.59 a piece.

I bought some from Amazon that were very tight fitting and plastic tab in front breaks off easily.

There are a lot of these holders with that front tab from different suppliers and they all seem to be made by the same manufacturer.

Also, just looking for similar supplier in case TayDa is out of stock on some items. I haven't found any other supplier other than TayDa with comparable prices.

Thanks again,
TonyAm

 

Keystone Electronics has similar battery holders (and a whole lot of other types and other hardware too). They are available through all the real distributors, at around $3 each.

Stuff like this and other components from Amazon have a high probability of being junk. And if you buy the same thing again at Amazon, it may be totally different.

 

Keystone Electronics has similar battery holders (and a whole lot of other types and other hardware too). They are available through all the real distributors, at around $3 each.

Stuff like this and other components from Amazon have a high probability of being junk. And if you buy the same thing again at Amazon, it may be totally different.

I did find them for $1.59 at Mouser, best price I could find. They are very well made (one's from Mouser).
Thanks.

 

Just have to point out that having tried Futurlec several times in the last 20+ years, I have a ways been disappointed.

Used Taydae Electronics once, had email discussions when the part did not behave the same as those of presumably the same manufacturer I have used for decades.

In short all the money I sent to these two vendors turned out to be a waste-it hurts to even throw out bad parts but I have thrown away everything from both vendors. As tempting as their offers of rare and hato-get parts might be, I will not buy from either again.

Though Aiexpress has been variable, they seem to do an acceptable job the vast majority of times I have used them.

eBay is variable but refunds are possible.

I use parts from the vendors mentioned above for non-serious uses.

For “real” work I stick with components purchased from authorized dealers. Why risk wasted hours of chasing problems due to bad or counterfeit parts when one can buy or get samples of genuine parts?

 

Used Taydae Electronics once, had email discussions when the part did not behave the same as those of presumably the same manufacturer I have used for decades.

Strange that that would happen. Their FAQ claims that they only buy from the manufacturers.


I've only bought from them once and haven't used the parts yet...

 

I've purchased from Tayda a few times now (pots, switches, resistors, caps) and their parts have always been good. I have yet to buy any of their IC chips, currently I have an order for some cmos chips.

After reading some reviews about IC chips from Amazon, I've decided against ordering those there. I also would rather not have to test everything I order, or go through the aggravation of buying things that don't work.

Has anyone purchased any chips from Tayda?

Thanks,
TonyAm

 

After reading some reviews about IC chips from Amazon, I've decided against ordering those there.

There's at least one reputable seller on Amazon (Jameco). But even I wouldn't buy IC's from Amazon or AliExpress. I'd take a chance on eBay if it was from someone who didn't have a store and things didn't ship from China (sellers in China will get wise and start drop shipping from other countries, so YMMV).

 

Why not purchase from Digikey, Mouser or Newark?
I just had an order for $26 fulfilled by Newark. There was no shipping charge.

 

Why not purchase from Digikey, Mouser or Newark?
I just had an order for $26 fulfilled by Newark. There was no shipping charge.

Yes, Newark is another option. I like the no shipping charge, will check it out.
Thanks again,
TonyAm

 

I like the no shipping charge

I always order a large enough dollar amount of items so I don't have to pay shipping, or it's not a significant cost.

 

While I rarely buy significant dollar amounts of individual components from AliExpress, I will do it buy some when the prices from reputable sources are more than I want to pay. For example, I wanted to start using power MOSFETs, but balked at paying almost $1 each (qty 10) for IRFZ44N, so I bought some on AliExpress for about $0.15 each (qty 10). Naturally they came packaged improperly and I had test 100% of them (50) for excessively high gate leakage (sign of ESD damage) and functionality. I tested them at about 6A and measured ON resistance.

How did you test them sir?, please tell as I’m having same problem of buying components from untrusted suppliers and need confirm if they are good or fake

 

It depends.

If you're experienced and know how to test components and troubleshoot circuits, it could be worth taking a chance on AliExpress (or Amazon, eBay, etc).

If you're inexperienced, you should stick with reliable distributors to save yourself some grief.


While I rarely buy significant dollar amounts of individual components from AliExpress, I will do it buy some when the prices from reputable sources are more than I want to pay. For example, I wanted to start using power MOSFETs, but balked at paying almost $1 each (qty 10) for IRFZ44N, so I bought some on AliExpress for about $0.15 each (qty 10). Naturally they came packaged improperly and I had test 100% of them (50) for excessively high gate leakage (sign of ESD damage) and functionality. I tested them at about 6A and measured ON resistance.

I had intended to buy IRLZ44N, so bought them at $0.20 each. They came packaged improperly (plastic bags again), so I had to test 100% of them (60 this time).

I wondered about the threshold voltage difference, so I designed a circuit to measure it. IRFZ44N were supposed to be 2-4V and IRLZ44N were supposed to be 1-2V. What I found was that all of them had a threshold voltage less than 2V.

Wanted some P MOSFETs to complement the N MOSFETs, so I bought some IRF4905 and IRF9540. Same thing. They came packaged improperly and I had to do 100% testing.

Since I know their origins, I won't treat them as authentic parts.

Also what are the important characteristics to measure when testing mosfet after purchase?