Hi group,
I have to report that I was victim of a fake transistor scam on eBay.
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UPDATEThanks to guidance provided in the forum I requested a refund through the eBay system.
Ebay policy:
"If a buyer suspects that an item is counterfeit, and there are strong indicators that the item is counterfeit, we don't require the buyer to return the item to the seller. The buyer agrees to cooperate with us to ensure the proper disposal of the item. In such instances, we refund the buyer for the full cost of the item and original shipping, and the seller reimburses us for the refund. The buyer may not sell the item on eBay or elsewhere."
I got the refund, from the seller, very quickly.
The catch is that I can not provide any feedback now on eBay. It is like this transaction never existed.
This loophole allow the sale of counterfeit parts to persist without warnings in the feedback system.
I have reported the item and several other items to eBay as being counterfeit, but as of now no action has been taken.
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StoryI purchased a total of 6 MJ16012 transistors, I needed two for the repair of an HP8662A RF generator with a damaged power supply.
Fortunately, I have a Tektronix 576 Curve tracer, so I checked the transistors before using them.
Bipolar transistors have a different breakdown voltage, depending on the base connection. The highest voltage is with the base-emitter shorted, the lowest voltage is with the base-emitter open.
Here are the test results:
This is the measured breakdown voltage with the Base-Emitter shorted:
The breakdown voltage is 340V.
This is the measured breakdown voltage with the Base-Emitter open:
The measured breakdown voltage is 110V.
This is the specifications:
For good measure this is the current gain:
The gain is around 250.
And specification show that the gain should be around 30:
Here is a picture of the fake transistor:
If I am reading the datecode correctly, this would be the 23rd week of 2015. I am sure that these parts were obsolete along time before this.
Does anybody know when on-semiconductor stopped making high voltage BJTs for smps?
I contact the seller, he told me he has sold hundreds no complaints, but will give refund if I return them.
I really want to leave negative feedback to warn others.
Seller's name is Semitronus
If you have bought any of these, I suggest that you check them before use.
Regards,
Jay_Diddy_B