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Old 7th Apr 2019, 3:43 pm   #18
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,903
Default Re: Chinese power transistors

Choosing later, more advanced devices gives no real confidence.

Mr faker is sitting out there with piles of cheapo transistors of all sorts of packages. An order comes in for 25 off 2N123456789. He picks the right package and that is what he has his machine mark them as. Pack, ship, profit!

A friend who worked for a large semiconductor firm put out a request for a few off of a type number which had never existed to several suspect suppliers. It was on his firms web site (he put it there). He got some price quotes and he took them up. Devices with that marking and his firm's logo turned up. His firm forbade him going public in the trade press, they didn't want to frighten their customers.

Real manufacturers are aware of the problem and now their attitude is to be open about it and strongly advise the use of only authorised distributors.

David
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