Read thru lots of posts about fake items so there is great potential for coming across these. Of course, the simple test of the failed units showing a short isn't the point of this post.
I wanted to get some people's experience with "stock they have on hand" to see if the "simple diode test" tells you anything more about the potential for having a good device (ie. maybe not fake) before soldering it to the board.
In diode mode, with the black lead on the emitter, and red on the center pin, the meter should read nothing. The test then is to put the red on the gate (opposite side from the emitter) for a short period to charge the gate, then put the red back on the center pin. Doing this with one set of fdg4536, I get a reading of .9v. One of these devices failed during my initial replacement effort. I had some more of these plus another batch. I tested the other batch and them seemed to show 2.6 volts. I used them and the second attempt resulted in two of those blowing their top plus others shorted. Not necessarily blaming them as my soldering maybe suspect but failure all the same.
I also some 30f131's ("far east" of course) and tried the same test.
However, I can't get them to "conduct" as touching the gate never seems to switch the emitter collector junction. Are the 30f131 that much different in design than the fdg4536's???
So my question to others here is... if you have some fdg4536 that you think / know are good, can you do a little test on one of them and state what the results of the diode test is and similarly if you have some "good" 30f131's around can you also try the same thing with one of them and post some of the results.
I know that the test doesn't give certainty on the "fakeness" of the device but perhaps the simple diode test might reveal something for us "one timers".
Thanks for any help / results.
I wanted to get some people's experience with "stock they have on hand" to see if the "simple diode test" tells you anything more about the potential for having a good device (ie. maybe not fake) before soldering it to the board.
In diode mode, with the black lead on the emitter, and red on the center pin, the meter should read nothing. The test then is to put the red on the gate (opposite side from the emitter) for a short period to charge the gate, then put the red back on the center pin. Doing this with one set of fdg4536, I get a reading of .9v. One of these devices failed during my initial replacement effort. I had some more of these plus another batch. I tested the other batch and them seemed to show 2.6 volts. I used them and the second attempt resulted in two of those blowing their top plus others shorted. Not necessarily blaming them as my soldering maybe suspect but failure all the same.
I also some 30f131's ("far east" of course) and tried the same test.
However, I can't get them to "conduct" as touching the gate never seems to switch the emitter collector junction. Are the 30f131 that much different in design than the fdg4536's???
So my question to others here is... if you have some fdg4536 that you think / know are good, can you do a little test on one of them and state what the results of the diode test is and similarly if you have some "good" 30f131's around can you also try the same thing with one of them and post some of the results.
I know that the test doesn't give certainty on the "fakeness" of the device but perhaps the simple diode test might reveal something for us "one timers".
Thanks for any help / results.
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