Almost all transistors I've bought from China (AliExpress / Alibaba / eBay) are fake. Even "recovered" items are sometimes re-labeled (but is off course not the same part and certainly does not have the same characteristics).
Three FLUKE METERS NOT Three Fukes You have to learn to pay attention to detail and learn how to write correct grammatical legal English. Your writing skill is below acceptable standard for you age unless you are age 8 Learn that CORPORATE legal names are ALWAYS in ALL CAPS It is even clearly written on the meter Because you were programmed to be a ZOMBIE - you do not notice ZOMBIES have eyes but cannot see - ears and cannot hear Understand that you are not a serious or qualified writer. Undertake an extensive reading program to educate yourself first
For a non-destructive test, saturate the MOSFET, and measure the Rds On. If you apply 1 amp across the drain-source junction, measuring the voltage across those terminals with the gate-source junction supplied with the specified voltage, you can compare your readings with the rating listed in the Datasheet, and tell if the transistor under test meets specifications for that type number. (at 1 amp, the voltage across the drain-source pins is exactly proportionate to Ohms) If the on-state resistance is higher, it's a fake. If the resistance is close to rated on-state resistance, then, it's worth the SOA (Safe Operating Area) testing. The devices you have in this video might be mislabeled IRF9510, with an Rds On of ~1.2 Ohms. It's only rated to dissipate 20 watts, which guarantees, that it will fail this test. The Rds On test would reveal the high on-state resistance, which would immediately disqualify it.
Rds ON not Rds On You have not yet learned the difference between ON / OFF ( and ) on / off They sound the same but they are not the same and are used in a different context. When you are referring to switching it is always ON / OFF written in the ALL CAPS It is even written on switches but you are blind to see it because you are not trained to pay attention to detail. Your eyes see one thing and your brain sees something entirely different. Your School programmed you to be a ZOMBIE So learn this and teach it to the ZOMBIES - EARN YOUR TEACHERS MEDAL
I done dumped out 300 hundred dollars trying to make a voltage booster on transistors they keep blowing I think cause they can't handle a 20% of there amps on data sheet.have not checked the gate voltage to see full turn on turn off but I tried diffrent transitors and some held at about 65% amp rating if not more they were awezeicc transistors .going to try order from digikey or mouser now and see what happens
I cannot understand how in a totalitarian state like China, people seem to produce counterfeits, fake and relabelled transistors with impunity. In Europe those people would be prosecuted, or should be prosecuted!
It,s time ebay and also the western country,s have to take actions against China fake sellers, unbelievable and even dangerous when get bad parts, like smps supply,s parts can explode. I have fake IRF9610 these get with a heatsink hot with just 10 mA idle current, that is bad.
Hi, thank you very much. Good, informative video. I have to test some power devices pretty shortly and will use my DC electronic load instead of resistors, a little more flexible. Thank you very much!
For the NPN transistor I use 7912,, but you can use it but if you redesign it, you just need a reference voltage to Get the transistor to give out approx 12 V, 12 volt was ok for me since I have a lot of 12 Ohm resistors and 32v power supply, that give me 20 V over the test transistor, ANg again give me power loss of 20w with 1A, 40w with 2A and so on .
This problem gets worse and worse also with most of ebay sellers, esp. from china. You can be nearly 100% sure you get fake if you order cheap mosfet, igbt or other transistor and even most ICs are counterfeits. Other methods of testing is measuring the Rdson (Drain-Source-Resistance when on under Load) and measure the drop voltage and divide by the current to get resistance. In most cases it is 2-5 times higher than specification in datasheet. Also the gate capacitance with fake mosfets will normally be lower due to smaller die and less micro-transistors on the die. I just bought fake IRFP4768 and IRFP4668 from China - was hoping for good but obviously fake. So you have to buy from local trustworthy suppliers ;-)
The schematic diagram on the video is the reference diagram for current boost regulator from the motorola 7812 datasheet. The more 12 Ohm resistors you add in parallel, the less total resistance as an output load and thus the current draw rises. I'm not sure though that, this way is the best for testing switching mosfets.
Hi Leif: Thank you for putting the video, this may help many unsuspecting people who buy from companies in China where components are recovered and resold as new. This I have suffered with Utsource that sells fake components and in most cases their shipments are delayed up to 2 months, honestly this although it does not seem very serious, but many of us do not give importance. Regards.
You need do claim and money back. I am very happy that you if repair some stuff from a 747 you check it 12 times ! it's a scam but you pay less for it. That way it stays that cheap, expensive is and the end.
Tank you for this informativo video!!!!!Fake semiconductors are very comon in low price supliers!!!!! Do you like good and trust components?FARNELL It is not cheap price but is very good quality!!!!!
I got a strange idea for a bad fake one, get a high voltage transformer and plug it in the wall and put the output of the transformer on the transistor and make a single use fire starter XD. (!WARNING! DO OUTSIDE, HIGH RISK OF FIRE!) don’t forget to record it.
I think it is great that the seller wrote "fake" right on the package. It really saves you time. You can throw them straight into the garbage. I have some 2n3055s with the tiniest die you have ever seen. I don't think you can buy genuine power transistors on eBay or Aliexpress. If you are only switching an amp or two they will probably be just fine. Great test rig by the way.
Super video!! I got fake transistors, voltage regulators, old and very bad electrolytic caps, faked audiophiler coupling caps, and the expensive things I ordered was never sent in the first place, just a fake shipping nr and no response from seller.. All ordered from AliXprss. So I stopped using that site and tried using e-bay instead. E-bay makes sure that their site's got only serious sellers with original parts to sell... right? ! Yea right... It turned out to be the same faked components & general swindle (from sellers in China) on e-bay too! Now I order my general electronics from elektronik-lavpris (danish webshop) and for special audio/tube audio related components I use Banzai-Music (german webshop (english version) The price is just too low on most electronix from china, and there is a good reason for that!!
Lots of fakes etc on Ebay BUT i have always received my money back either from the seller or from Ebay itself......havent you? If i did not, i would quit using Ebay for sure.
Interesting. Do you think they are bad copies of the original, ie Chinese manufactured but poorly made, or relabelled lower rated MOSFETs. I got some ST P60NSO4Z and the 1st looks original, but the last 2 Ali's were half price and obviously fake, They all work fine in my application, but I bet the fakes don't have the added protection that the orig ST has. scontent.fsyd4-1.fna.fbcdn.net/v/t1.0-9/20292907_10211548004149498_6986208648774848690_n.jpg?oh=667d851128e5a542ac6e34a596eea39b&oe=59F60984 Do you think your test will work on the STP60NSO4Z.
Hi, the problem is that it Is so many sellers that sell fake stuff, It is actually hard to find someone that sell real stuff, and I have buy a lot before I found out it all was fake, both from Ebay and Alix, I did report it but nothing happend, Some sellers have pitures of the original but send fake.
Hi, I have make a better Circuit now that can test all transistor npn, pnp, mosfet and darlington, planing to make a new Video about that :) The Circuit at video are not 100% stabil for all transistors I discover that after I make this video.
Do you have a schematic for your new test circuit - I have purchased a lot of transistors from Ebay and have been trying to find a way to test them before putting them in the actual circuit.
Almost all transistors I've bought from China (AliExpress / Alibaba / eBay) are fake. Even "recovered" items are sometimes re-labeled (but is off course not the same part and certainly does not have the same characteristics).
Three Fukes,you are serious electronics engineer 🙂 Thank you for making that circuit and for making the video.Great stuff!
Three FLUKE METERS NOT Three Fukes You have to learn to pay attention to detail and learn how to write correct grammatical legal English. Your writing skill is below acceptable standard for you age unless you are age 8 Learn that CORPORATE legal names are ALWAYS in ALL CAPS It is even clearly written on the meter Because you were programmed to be a ZOMBIE - you do not notice ZOMBIES have eyes but cannot see - ears and cannot hear Understand that you are not a serious or qualified writer. Undertake an extensive reading program to educate yourself first
Maybe one is real,other 2 meters are fake?
Aliexpress transistors terrible bad quality... 💩
For a non-destructive test, saturate the MOSFET, and measure the Rds On. If you apply 1 amp across the drain-source junction, measuring the voltage across those terminals with the gate-source junction supplied with the specified voltage, you can compare your readings with the rating listed in the Datasheet, and tell if the transistor under test meets specifications for that type number. (at 1 amp, the voltage across the drain-source pins is exactly proportionate to Ohms) If the on-state resistance is higher, it's a fake. If the resistance is close to rated on-state resistance, then, it's worth the SOA (Safe Operating Area) testing. The devices you have in this video might be mislabeled IRF9510, with an Rds On of ~1.2 Ohms. It's only rated to dissipate 20 watts, which guarantees, that it will fail this test. The Rds On test would reveal the high on-state resistance, which would immediately disqualify it.
Rds ON not Rds On You have not yet learned the difference between ON / OFF ( and ) on / off They sound the same but they are not the same and are used in a different context. When you are referring to switching it is always ON / OFF written in the ALL CAPS It is even written on switches but you are blind to see it because you are not trained to pay attention to detail. Your eyes see one thing and your brain sees something entirely different. Your School programmed you to be a ZOMBIE So learn this and teach it to the ZOMBIES - EARN YOUR TEACHERS MEDAL
Are Moose FETs made in Canada?
I done dumped out 300 hundred dollars trying to make a voltage booster on transistors they keep blowing I think cause they can't handle a 20% of there amps on data sheet.have not checked the gate voltage to see full turn on turn off but I tried diffrent transitors and some held at about 65% amp rating if not more they were awezeicc transistors .going to try order from digikey or mouser now and see what happens
See datasheet of transistor there have test circuit
IRF 9540 is a MOSFET......
Field Effect Transistor
I cannot understand how in a totalitarian state like China, people seem to produce counterfeits, fake and relabelled transistors with impunity. In Europe those people would be prosecuted, or should be prosecuted!
جعموصه قشنگه👍👍👍👍👍😎😎😎😎
It,s time ebay and also the western country,s have to take actions against China fake sellers, unbelievable and even dangerous when get bad parts, like smps supply,s parts can explode. I have fake IRF9610 these get with a heatsink hot with just 10 mA idle current, that is bad.
Hi, thank you very much. Good, informative video. I have to test some power devices pretty shortly and will use my DC electronic load instead of resistors, a little more flexible. Thank you very much!
For the NPN transistor I use 7912,, but you can use it but if you redesign it, you just need a reference voltage to Get the transistor to give out approx 12 V, 12 volt was ok for me since I have a lot of 12 Ohm resistors and 32v power supply, that give me 20 V over the test transistor, ANg again give me power loss of 20w with 1A, 40w with 2A and so on .
Are you using a 7912 for the NPN test?
This problem gets worse and worse also with most of ebay sellers, esp. from china. You can be nearly 100% sure you get fake if you order cheap mosfet, igbt or other transistor and even most ICs are counterfeits. Other methods of testing is measuring the Rdson (Drain-Source-Resistance when on under Load) and measure the drop voltage and divide by the current to get resistance. In most cases it is 2-5 times higher than specification in datasheet. Also the gate capacitance with fake mosfets will normally be lower due to smaller die and less micro-transistors on the die. I just bought fake IRFP4768 and IRFP4668 from China - was hoping for good but obviously fake. So you have to buy from local trustworthy suppliers ;-)
The schematic diagram on the video is the reference diagram for current boost regulator from the motorola 7812 datasheet. The more 12 Ohm resistors you add in parallel, the less total resistance as an output load and thus the current draw rises. I'm not sure though that, this way is the best for testing switching mosfets.
Very clever , thanks 😉🇬🇧
Chinese market has too many fake products. Be careful.
You are testing switch mode mosfets in linear mode? No doubt they will fail even if they are fake weaker models
Did you mention China?
Hi Leif: Thank you for putting the video, this may help many unsuspecting people who buy from companies in China where components are recovered and resold as new. This I have suffered with Utsource that sells fake components and in most cases their shipments are delayed up to 2 months, honestly this although it does not seem very serious, but many of us do not give importance. Regards.
You need do claim and money back. I am very happy that you if repair some stuff from a 747 you check it 12 times ! it's a scam but you pay less for it. That way it stays that cheap, expensive is and the end.
When your so poor you have to make fake transistors💀
Hi Leif,, Thank you for doing this video and showing this, I was wondering if there is any way to Test for True J201 Transistors? Thank you.
Fake transistor - Fake video :D
L7812CVs are typically only rated for 1.5A. So I wouldn't necessarily call them fake they are just lower quality but likely still meet the spec.
you have got nice accent.what's your native language?
Look like he is German
@@voitano73 NOPE, he is from the west coast of Norway ;-)
Tank you for this informativo video!!!!!Fake semiconductors are very comon in low price supliers!!!!! Do you like good and trust components?FARNELL It is not cheap price but is very good quality!!!!!
Irf 9540 is p channal mosfet not transistor so is this right way?
Well done man .
이렇게 확인해도 되겠네. 대박이다. wonderful video!
Very nice 😃
Thanks leif sharing test for fake transistor.. Hehehe made in china..😂😂 china number one fake..😂😂
What wattage and value is the resistor in the project box?
it 's 10 ohm (from schematic) and it look like 2 watt but what about the capacitor ?
I got a strange idea for a bad fake one, get a high voltage transformer and plug it in the wall and put the output of the transformer on the transistor and make a single use fire starter XD. (!WARNING! DO OUTSIDE, HIGH RISK OF FIRE!) don’t forget to record it.
I got a fake transistor from utsource marked with ON semiconductor
Yes Utsource sells original and fake components. Cheers.
I think it is great that the seller wrote "fake" right on the package. It really saves you time. You can throw them straight into the garbage. I have some 2n3055s with the tiniest die you have ever seen. I don't think you can buy genuine power transistors on eBay or Aliexpress. If you are only switching an amp or two they will probably be just fine. Great test rig by the way.
It's alot things can go wrong
Super video!! I got fake transistors, voltage regulators, old and very bad electrolytic caps, faked audiophiler coupling caps, and the expensive things I ordered was never sent in the first place, just a fake shipping nr and no response from seller.. All ordered from AliXprss. So I stopped using that site and tried using e-bay instead. E-bay makes sure that their site's got only serious sellers with original parts to sell... right? ! Yea right... It turned out to be the same faked components & general swindle (from sellers in China) on e-bay too! Now I order my general electronics from elektronik-lavpris (danish webshop) and for special audio/tube audio related components I use Banzai-Music (german webshop (english version) The price is just too low on most electronix from china, and there is a good reason for that!!
Lots of fakes etc on Ebay BUT i have always received my money back either from the seller or from Ebay itself......havent you? If i did not, i would quit using Ebay for sure.
Hi dad
Hei på dei :)
GGamer Wolfie hei på deg :)
ruclips.net/video/mJUSYVCE5wY/видео.html Fake Electronic Parts Seller in Aliexpress-Power Transistor MJ15025G and 15024G---알리익스프레스 가짜 트랜지스터
So the function of the 7812 is to keep the Mosfet output (drain) at 12 V?
Yes that is correct
Interesting. Do you think they are bad copies of the original, ie Chinese manufactured but poorly made, or relabelled lower rated MOSFETs. I got some ST P60NSO4Z and the 1st looks original, but the last 2 Ali's were half price and obviously fake, They all work fine in my application, but I bet the fakes don't have the added protection that the orig ST has. scontent.fsyd4-1.fna.fbcdn.net/v/t1.0-9/20292907_10211548004149498_6986208648774848690_n.jpg?oh=667d851128e5a542ac6e34a596eea39b&oe=59F60984 Do you think your test will work on the STP60NSO4Z.
You should include the store name from AliX so no one ever buys anything from them.
Hi, the problem is that it Is so many sellers that sell fake stuff, It is actually hard to find someone that sell real stuff, and I have buy a lot before I found out it all was fake, both from Ebay and Alix, I did report it but nothing happend, Some sellers have pitures of the original but send fake.
cool circuit. i might build one.
Hi, I have make a better Circuit now that can test all transistor npn, pnp, mosfet and darlington, planing to make a new Video about that :) The Circuit at video are not 100% stabil for all transistors I discover that after I make this video.
+Leif Hegre hi, could RUclips share your idea, circuit about your new tester?
Do you have a schematic for your new test circuit - I have purchased a lot of transistors from Ebay and have been trying to find a way to test them before putting them in the actual circuit.