Capacitors and ESD
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From: John Larkin on 18 Jan 2010 23:41 On Mon, 18 Jan 2010 22:34:04 -0600, "Tim Williams" <tmoranwms(a)charter.net> wrote: >"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >news:ot6al5pi072rjuve8kn52upk48m6c09d53(a)4ax.com... >> I tested some 0603 16 volt ceramic caps to see when they'd fail. At >> 120 volts, the limit of my supply, they were still OK. > >Of course, they'd be no good at bypassing at that voltage. The D-E curve >(think B-H) is going to be flat as Kansas. > >Tim Why are you spoiling my fun? John
From: Tim Williams on 19 Jan 2010 00:16 "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message news:6udal5t621q5fekd3j96uqlc6h9v1o28oh(a)4ax.com... >>Of course, they'd be no good at bypassing at that voltage. The D-E curve >>(think B-H) is going to be flat as Kansas. > > Why are you spoiling my fun? Fun? You aren't having fun, the damn thing didn't even explode. ;-) Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: John Larkin on 19 Jan 2010 00:39 On Mon, 18 Jan 2010 23:16:46 -0600, "Tim Williams" <tmoranwms(a)charter.net> wrote: >"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >news:6udal5t621q5fekd3j96uqlc6h9v1o28oh(a)4ax.com... >>>Of course, they'd be no good at bypassing at that voltage. The D-E curve >>>(think B-H) is going to be flat as Kansas. >> >> Why are you spoiling my fun? > >Fun? You aren't having fun, the damn thing didn't even explode. ;-) > >Tim Ceramic caps are nonlinear enough that you could make a useful parametric amplifier from some. Hmmm, and a fA-sensitive amplifier. John
From: Tim Williams on 19 Jan 2010 01:28 "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message news:fahal5h0g29cg6dbl69ngejqd9javkiujj(a)4ax.com... > Ceramic caps are nonlinear enough that you could make a useful > parametric amplifier from some. > > Hmmm, and a fA-sensitive amplifier. I recall HP already had made a leakage meter like that, using diode capacitance instead. With pA-sensitive op-amps available these days, there isn't much point in doing that. Yeah, you said fA, but you'd be taking days to accumulate any charge to measure it. Unless it was a microscopic hunk, like if you got at a single cell of FeRAM. Ah, but a monolithic femtoammeter would perform well, wouldn't it? Still, it would be quite noisy. You might end up with a better thermometer. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Wimpie on 19 Jan 2010 10:31
On 19 ene, 00:39, blanko <electro...(a)yahoo.com> wrote: > Are capacitors ESD sensitive? Please explain. > > Ceramtic? > > Tantalum? > > I know that some of the ceramic caps that I am working with are rated > at 25 volts. An ESD zap can be multiples of 1000 V. I believe that > the capacitors are ESD sensitive because I will exceed the max rated > voltage. Is this true? > > Thank you. > > -E Hello, Yes ESD can destroy MLCC capacitors, even below the voltage breakdown limit. Try to locate "DC, AC and Pulse Load of Multilayer Ceramic Capacitors". This is a former PHILIPS document. You can probably find it on www.koaspeer.com also. There are more documents around, but this one gives the data in an easy to understand way. If you can't locate it, please contact me. Best regards, Wim PA3DJS www.tetech.nl without abc your PM will reach me. |