I bought what I thought was a bunch of dual N-channel JFETs for cheap, and on the curve tracer, I could not believe how good the match was between 2 devices in a can. When I put one in a diff amp circuit, the circuit did not work at all. Good on a tracer but bad in the circuit. I cut one open to find just one single JFET die, bonded out to both sets of pins on the can. No wonder the match was so good.
Unfortunately, these days you would be wise not to buy parts on eBay or Alibaba - but use reputable organisations like RS, Element14, Mouser or Digikey, who take care to ensure their supply lines are genuine. 🙁
Andy
I bought them from Questcomp,
As I have not seen this siliconix logo like this, I asked here.
I will test and cut open 1 piece....
As I have not seen this siliconix logo like this, I asked here.
I will test and cut open 1 piece....
I found that there is 2 separate fets inside one 2n5911. I use DCA 75 to test one side of the dual FET, with all other pins shorted, and the change side to test again.
Hello everybody,
recentely I got some Toshiba JFETs 2SK363-BL. They are brand new but have unusual very short legs, just long enough to solder in the PCB. I have never seen this type of leg so short. Pls, Can the experts give me information about? Are surely fake?
Thanks in advance for the reply, Luca
recentely I got some Toshiba JFETs 2SK363-BL. They are brand new but have unusual very short legs, just long enough to solder in the PCB. I have never seen this type of leg so short. Pls, Can the experts give me information about? Are surely fake?
Thanks in advance for the reply, Luca
What you wrote makes sense to me. The legs are long only 7 mm. Just what remains after a flush cut of a board. At least they would have to be not fake if was recovered. Who snips off fake JFETs?
Hi all. I've bought a few pcs of 2SK246-GR. I am trying to check them by tracing curves.
My curve Ids (Vds):
datasheet:
What else should I measure to be sure that the transistor is genuine?
Thanks!
My curve Ids (Vds):
datasheet:
What else should I measure to be sure that the transistor is genuine?
Thanks!