torturing caps

Hi,

Ok, so I could be using cheap 16V/0.1uF ceramic caps on my 100VDC rail, but the only problem is I am guessing the 16V caps capacitance will be far lower than 0.1uF at 100V, compared to an equivalent 100V/0.1uF capacitor. But as you say that would be an interesting test to verify. I had always assumed a 16V ceramic cap could undergo failure if it got a 20V spike on it :)

cheers, Jamie

snip

Why don't you add a little ripple on top of the DC?

tm

At least for ceramic caps, the C/V curve is highly nonlinear and I suspect the voltage rating has some correspondence to that. Viz., The rating really represents the voltage range in which the cap is linear which is generally much less than the maximum breakdown voltage.

Maybe you could do a few C/V curves to see just how much it matters?

Like... who gives a f*** ? ...Jim Thompson

What methods do you suggest I could use to investigate it?

Crazy, crabby old hen.

John

Fraud? Do you think I just made up those numbers?

Now girls, try to be civil with one another. You don't have many allies to lose here.

John

OK, But it's very boring ;-) ...Jim Thompson

I can understand lying about how big your Johnson is, but why would someone exaggerate the volts across a cap?

Bob

I have suspected that 1N4001 through maybe 1N4004 all come off the same wafer. 1N4005 through 7, roughly, seem to come off another wafer, behaving a lot more PIN-diodely.

John

Well....there are quite a number of usens indie group that would like to know.. ..and would have carried out the experiment, recording data, and presented it out of curiosity and courtesy to all.

On a sunny day (Tue, 14 Jun 2011 19:13:18 -0600) it happened m II wrote in :

Yes I have noticed that I can use some 100 V si diodes up to 600 V without any problem, and that at several kHz on top, same for some bridges,

On a sunny day (Tue, 14 Jun 2011 18:53:30 -0700) it happened Jamie wrote in :

I think for things like 1N?00X where X stands for voltage, they just make one diode at say the max voltage, and then print something for the X. Much cheaper than manufacturing different ones for each voltage. So then it is safe to use a 100 V part at 600 V :-)

The very old Motorola data almost says that out loud... the recovery times, for example, which are seldom even hinted at on modern data sheets.

Best regards, Spehro Pefhany

If hypothetically one tested the diodes to see what they were capable of, applying what reverse leakage current level would be good to determine max v ability?

NT