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Old 30th June 2004, 05:51 AM   #1
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Default xicon polystyrene caps?

has any one tried the xicon 50v dc polystyrene caps from mouser for bypassing such as op amps? thought about trying some but, hoped i might get some input from someone who has used them before and their results. thanks, crippledchicken
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Old 30th June 2004, 06:10 AM   #2
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For bypassing???????

Jocko
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Old 30th June 2004, 11:10 AM   #3
johnf is offline johnf  Germany
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Default Re: xicon polystyrene caps?

Quote:
Originally posted by crippledchicken
has any one tried the xicon 50v dc polystyrene caps from mouser for bypassing such as op amps?....
You may find that self-defeating. Generally, you try to place a bypass/decoupling capacitor as close as you can to its target. The enormous size of a polysterene compared to, say, a multilayer ceramic may add an excessive amount of trace and/or lead inductance. Polystyrene capacitors are great but I would use them elsewhere.
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Old 30th June 2004, 05:08 PM   #4
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hi johnf, i just wanted to verify that we are talking about the same type caps and uses. i was thinking of using them to bypass +/- op amp power pins to ground. are these the type you are refering to? thanks crippledchicken http://www.mouser.com/index.cfm?hand..._pcodeid=02310
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Old 30th June 2004, 05:28 PM   #5
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The values are awful small to really be effective as a bypass.

Jocko
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Old 30th June 2004, 05:44 PM   #6
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that's kind of what i thought, a.1 value would probably be better. at the time i'm using orange drop polypropylene and was wanting to upgrade but, wanted to get a more experienced opinion. thank very much, i'll just pass on those then and save my money. crippledchicken
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Old 30th June 2004, 07:05 PM   #7
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Just for fun, I measured the 100nF X7R ceramics I have been using. These are so small, I can place them in a 0.1 inch gap between IC sockets and even in the voids inside an IC socket. I calculate they have about 1/40th the volume of the 10nF parts you were considering. I don't want to imagine how big a 100nF polystyrene would be, or how much space ten smaller values would take.
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Old 1st July 2004, 02:06 AM   #8
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hi, seems i've read that ceramics were not the ideal choice to use that polypropylenes such as the orange drops, stacked pp caps and wimas, sometimes film and foil, are the better choices. i guess maybe it might just be pretty much circuit dependent , individual preferences etc. i just didn't realize the polystyrenes were so much larger than the rest. i read so many articles, and different opinions on whats the best, that it gets pretty confusing hehe but, oh well i'm learning and appreaciate all the great help on the forums thanks, crippledchicken
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Old 2nd July 2004, 08:34 AM   #9
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Multilayer ceramic caps are a wholly different animal than "regular" ceramic disc capacitors. They are excellent for power supply bypassing purposes. Polypropylene, polystyrene, polycarbonate, etc., film caps are not as good for this application due to their large physical size as stated. They are better for audio signal coupling (if you must have them at all), or for use in filters, etc.

-Ti
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Old 2nd July 2004, 09:57 AM   #10
djQUAN is offline djQUAN  Philippines
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hey guys, I was able to get a scrap PCB with square yellow ceramic caps in them (about 4mm square with a dab of green paint on the top, much like a regular ceramic disk but square and yellow). dunno what kind of ceramic it is really but I used them in my 5 way LR crossover by Rod, 22nF each and don't have any problems.
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