Capacitance versus voltage for X7S caps?
in [Design]
|
Prev: Automotive datalogger power(down) supply strategy
Next: What do you call it/where do you get it?
From: John Devereux on 26 Mar 2010 04:15 legg <legg(a)nospam.magma.ca> writes: [...] > EIA STANDARD RS 198 > > lowest TEMP - 1st designator > - 55 °C - X > - 30 °C - Y > + 10 °C - Z > > highest temp - 2nd designator > + 45 °C - 2 > + 65 °C - 4 > + 85 °C - 5 > + 105 °C - 6 > + 125 °C - 7 > > tolerance - 3rd designator > ± 1 % - A > ± 1.5 % - B > ± 2.2 % - C > ± 3.3 % - D > ± 4.7 % - E > ± 7.5 % - F > ± 10 % - P > ± 15 % - R > ± 22 % - S > + 22 %/-33 % - T > + 22 %/-56 % - U > + 22 %/-82 % - V > > RL Sorry if a dumb question, but are those tolerances the worst case extremes over the temperature and voltage ranges? Thanks, -- John Devereux
From: legg on 26 Mar 2010 07:23 On Fri, 26 Mar 2010 08:15:52 +0000, John Devereux <john(a)devereux.me.uk> wrote: >legg <legg(a)nospam.magma.ca> writes: > >[...] >> EIA STANDARD RS 198 >> >> lowest TEMP - 1st designator >> - 55 �C - X >> - 30 �C - Y >> + 10 �C - Z >> >> highest temp - 2nd designator >> + 45 �C - 2 >> + 65 �C - 4 >> + 85 �C - 5 >> + 105 �C - 6 >> + 125 �C - 7 >> >> tolerance - 3rd designator >> � 1 % - A >> � 1.5 % - B >> � 2.2 % - C >> � 3.3 % - D >> � 4.7 % - E >> � 7.5 % - F >> � 10 % - P >> � 15 % - R >> � 22 % - S >> + 22 %/-33 % - T >> + 22 %/-56 % - U >> + 22 %/-82 % - V >> >> RL > >Sorry if a dumb question, but are those tolerances the worst case >extremes over the temperature and voltage ranges? > The tolerance is over the temperature range indicated, without any other influence considered. RL
From: Joerg on 26 Mar 2010 09:55 Robert Baer wrote: > Joerg wrote: >> qrk wrote: >>> If you can't find data, send me a sample and I can run it on our >>> HP4194 impedance analyzer. >>> >> >> Thanks for the offer, Mark. I have a HP4191 here so I could also do >> that. But this project is too fast-track. Needs to go into layout >> ideally by tonight or tomorrow morning, no time to get samples here. >> >> It blows my mind that maufacturers do not furnish such data. This time >> that could cost the sales since w may go hi-rel electrolytic, to be on >> the safe side. >> > ...in which case that 0.1 height restriction gets blown. Nope, it won't :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 26 Mar 2010 09:59 legg wrote: > On Fri, 26 Mar 2010 08:15:52 +0000, John Devereux > <john(a)devereux.me.uk> wrote: > >> legg <legg(a)nospam.magma.ca> writes: >> >> [...] >>> EIA STANDARD RS 198 >>> >>> lowest TEMP - 1st designator >>> - 55 �C - X >>> - 30 �C - Y >>> + 10 �C - Z >>> >>> highest temp - 2nd designator >>> + 45 �C - 2 >>> + 65 �C - 4 >>> + 85 �C - 5 >>> + 105 �C - 6 >>> + 125 �C - 7 >>> >>> tolerance - 3rd designator >>> � 1 % - A >>> � 1.5 % - B >>> � 2.2 % - C >>> � 3.3 % - D >>> � 4.7 % - E >>> � 7.5 % - F >>> � 10 % - P >>> � 15 % - R >>> � 22 % - S >>> + 22 %/-33 % - T >>> + 22 %/-56 % - U >>> + 22 %/-82 % - V >>> >>> RL >> Sorry if a dumb question, but are those tolerances the worst case >> extremes over the temperature and voltage ranges? >> > The tolerance is over the temperature range indicated, without any > other influence considered. > And that's not telling anything about voltage tolerance. The temp curves are usually in the datasheets, voltage graphs aren't anymore :-) Dumbed-down datasheets are even a problem in semiconductors. There are "new and improved" datasheets of PIN diodes where carrier lifetime is no longer listed. Luckily I hang on to the old ones. About 10ft shelf space worth of data. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: legg on 26 Mar 2010 19:59
On Fri, 26 Mar 2010 06:59:10 -0700, Joerg <invalid(a)invalid.invalid> wrote: >legg wrote: > >And that's not telling anything about voltage tolerance. The temp curves >are usually in the datasheets, voltage graphs aren't anymore :-) > The TDK graphing utility is really quite good. Perhaps you might encourage this kind of data service by buying only those parts for which info IS provided. TDK will even plot multiple selections on the same axis - just be very general about your initial selections - voltage, body size and maybe tempco. http://www.tdk.co.jp/ccv/index.asp I'm sure they're not the only vendor still supplying useful data. Just be sure to label an store it for easy retrieval, once obtained, to save trouble the next time around. RL |