Smallest 4.7uF polypropylene capacitor

Status
Not open for further replies.
Jump to Latest
#2
That's about as small as they get in currently available parts to my knowledge.

The ECW-F(A) is slightly shorter at 23.8mm in 4.7uF but larger in other dimensions (x 14.8 x 20.6).

I've been keeping tabs on the same thing for 2.2uF items, and noticed last week that a "new product" on mouser has 1uF in a substantially smaller package, not stocked right now: http://mouser.com/ProductDetail/Panasonic/ECW-FD2W105Q1

Not sure if it holds any hope for the higher capacitances though.
 
#3
Yes, for 1 uF, that Panasonic can't be beat. It seems that the turning point comes at about 2.2uF---a polypropylene Panasonic ECW-FD2W225JB is about 17 x 11 mm and will just barely fit most applications. Above that value, you are left with three choices, really---electrolytic, non-polar electrolytic, or polyester. As Cyril Bateman pointed out in his epic paper on capacitor distortion (https://linearaudio.nl/sites/lineara...0or film.pdf) the bipolars (such as Nichicon MUSE) are superior to polarized caps, but “the best electrolytic, the Bi-polar type, was clearly beaten by the good metallised PET”. I have found that a fairly new product from WIMA (a PET---- MKS2B051001N00JO00) is exceptional in its combination of fairly large capacitance (10uF), small size (7x11mm), low ESR/DF (~12 times lower than the MUSE), and low distortion (< 0.0002%, -114db). It is a bit on the pricey side, as they are $3.01 each, but I have found no other cap that comes close to its performance/size.
 
#4
Did you consider Polyphenylene Sulphide capacitors like this one (will be back in stock at the end of Summer)? They are bigger than Polyester but smaller than Polypropylene caps. Cyril Bateman writes about them starting at page 10 an onward in "Capacitor Sounds 4 - capacitances from 100 nF to 1 μF".
 
#7
dotneck335 said:
Yes, for 1 uF, that Panasonic can't be beat. It seems that the turning point comes at about 2.2uF---a polypropylene Panasonic ECW-FD2W225JB is about 17 x 11 mm and will just barely fit most applications. Above that value, you are left with three choices, really---electrolytic, non-polar electrolytic, or polyester. As Cyril Bateman pointed out in his epic paper on capacitor distortion (https://linearaudio.nl/sites/lineara...0or film.pdf) the bipolars (such as Nichicon MUSE) are superior to polarized caps, but “the best electrolytic, the Bi-polar type, was clearly beaten by the good metallised PET”. I have found that a fairly new product from WIMA (a PET---- MKS2B051001N00JO00) is exceptional in its combination of fairly large capacitance (10uF), small size (7x11mm), low ESR/DF (~12 times lower than the MUSE), and low distortion (< 0.0002%, -114db). It is a bit on the pricey side, as they are $3.01 each, but I have found no other cap that comes close to its performance/size.
Click to expand...
Are you using these higher value capacitors for filtering or as DC blocking?

Look again at the reports:
he tells us that bipolar are lower distortion than the polar and that film are lower distortion than bipolar, when used as filters.
He goes on to tell us that back to back polar are better than single polar, but don't add a bias voltage to the centre tap. He also confirms that back to back bipolar are better than single bipolar, again no bias voltage. And mentions that back to back bipolar are nearly as good as the lower performing plastics.

Now apply that to a DC blocking duty and you will find that back to back polar and/or back to back bipolar perform as well as any plastic film because you are not asking them to operate as filters.
 
Last edited:
Status
Not open for further replies.
Top Bottom