Hi all,
I was testing some sot23 jfets and made an error, with the gate and drain tied together instead of gate and source. Unsurprisingly the jfet conducted enthusiastically and hit the 400ma current limit that I had set on the power supply. I then turned it off (within seconds).
My question is would this damage the parts? The supply was at 10v so the part was dissipating a lively 4W for a few seconds.
As a corollary, what is the continuous dissipation for a sot23 Bart? The intended purpose is as a complementary buffer at the front end of a F6 with somewhat lower PSU rails...
I was testing some sot23 jfets and made an error, with the gate and drain tied together instead of gate and source. Unsurprisingly the jfet conducted enthusiastically and hit the 400ma current limit that I had set on the power supply. I then turned it off (within seconds).
My question is would this damage the parts? The supply was at 10v so the part was dissipating a lively 4W for a few seconds.
As a corollary, what is the continuous dissipation for a sot23 Bart? The intended purpose is as a complementary buffer at the front end of a F6 with somewhat lower PSU rails...
You know me -
If it's not for a customer, I am fearless.
And I would want to find out...
That's the best one yet.
I love it.
It doesn't get much better than that.
There is something about destructive testing and curiosity that never gets boring.
Last edited:
Last time I had that kind of entertainment, Wayne and I were destruct
testing SIT-1's.
Pop!
There goes another $100.
Last time I had that kind of entertainment, Wayne and I were destruct
testing SIT-1's.
Pop!
There goes another $100.
Hahahahahaha
Last time I had that kind of entertainment, Wayne and I were destruct
testing SIT-1's.
Pop!
There goes another $100.
And every greedy diy-er on the pass labs part of this forum just flinched there.
A small surface mount package will usually show a bulge on it's top surface when power rating is grossly exceeded.
A simple test with an Ohmmeter will tell the tale. From Drain to Source you should see a resistance somewhat close the the Rds(on) number from the data sheet. The Gate to Drain (or to Source) should show a diode like reading, low resistance one direction and very high with reverse polarity.
A simple test with an Ohmmeter will tell the tale. From Drain to Source you should see a resistance somewhat close the the Rds(on) number from the data sheet. The Gate to Drain (or to Source) should show a diode like reading, low resistance one direction and very high with reverse polarity.
Testing with a fake 7mA J74BL by treating it like an NJFET for 10V IDSS test with just 25mA PSU CC limit for a minute it did not blow up but after a little time the CV started to rise near 8V giving it about 200mW. After that its RDS permanently went from circa 20 Ohm to 618 Ohm and its IDSS down to 0.5mA. It ended up in the bin that it was going to anyway
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.