Forums

Cap leakage

Started by Jamie November 8, 2011
I had to buy some BP/NP caps today "16V 470Uf" and the pickings were
slim. In fact, I was looking for a Axial package of that value
and could not find any one that had stock of that type or even list it.

   So I ended up getting some Radial types from "NICHICON". "CHicago 
Capacitor" wanted a min or of 3k pieces at .98 etc, we only need 150 but
at least they were willing to make them. But back to what we ended up
ordering.

   I notice the leakage was up around 320ua or something, isn't that
kind of high ?

   I am not really worried about that because of where they are being
used, which won't get effected by this but really, it just seems high.

Jamie


On 11/8/2011 6:31 PM, Jamie wrote:
> I had to buy some BP/NP caps today "16V 470Uf" and the pickings were > slim. In fact, I was looking for a Axial package of that value > and could not find any one that had stock of that type or even list it. > > So I ended up getting some Radial types from "NICHICON". "CHicago > Capacitor" wanted a min or of 3k pieces at .98 etc, we only need 150 but > at least they were willing to make them. But back to what we ended up > ordering. > > I notice the leakage was up around 320ua or something, isn't that > kind of high ? > > I am not really worried about that because of where they are being > used, which won't get effected by this but really, it just seems high. > > Jamie
Hi, Jamie- How long did you test the leakage? Try allowing the cap to sit with applied voltage for a while and the measure. Let us know how that goes. Cheers, John S
On 11/8/2011 6:55 PM, John S wrote:
> On 11/8/2011 6:31 PM, Jamie wrote: >> I had to buy some BP/NP caps today "16V 470Uf" and the pickings were >> slim. In fact, I was looking for a Axial package of that value >> and could not find any one that had stock of that type or even list it. >> >> So I ended up getting some Radial types from "NICHICON". "CHicago >> Capacitor" wanted a min or of 3k pieces at .98 etc, we only need 150 but >> at least they were willing to make them. But back to what we ended up >> ordering. >> >> I notice the leakage was up around 320ua or something, isn't that >> kind of high ? >> >> I am not really worried about that because of where they are being >> used, which won't get effected by this but really, it just seems high. >> >> Jamie > > Hi, Jamie- > > How long did you test the leakage? Try allowing the cap to sit with > applied voltage for a while and the measure. Let us know how that goes.
^^^^ then
John S wrote:

> On 11/8/2011 6:31 PM, Jamie wrote: > >> I had to buy some BP/NP caps today "16V 470Uf" and the pickings were >> slim. In fact, I was looking for a Axial package of that value >> and could not find any one that had stock of that type or even list it. >> >> So I ended up getting some Radial types from "NICHICON". "CHicago >> Capacitor" wanted a min or of 3k pieces at .98 etc, we only need 150 but >> at least they were willing to make them. But back to what we ended up >> ordering. >> >> I notice the leakage was up around 320ua or something, isn't that >> kind of high ? >> >> I am not really worried about that because of where they are being >> used, which won't get effected by this but really, it just seems high. >> >> Jamie > > > Hi, Jamie- > > How long did you test the leakage? Try allowing the cap to sit with > applied voltage for a while and the measure. Let us know how that goes. > > Cheers, > John S >
I have not tested these, its just data I saw at mouser today while I was ordering. I was just shocked at the leakage of the BP's compared to polarized versions. I think mouser must have a miss print.. http://www.mouser.com/ProductDetail/Nichicon/UVP1C471MPD/?qs=sGAEpiMZZMtZ1n0r9vR22doNkPAgsBxuSlC380FiEts%3d and from the MF. http://products.nichicon.co.jp/en/pdf/XJA043/e-vp.pdf Leakage looks good from the MF. Jamie
"Jamie =  Maynard A. Philbrook fuckwit radio ham.

 Jamie wrote:
> >> I notice the leakage was up around 320ua or something, isn't that >>> kind of high ? >>> >>> I am not really worried about that because of where they are being >>> used, which won't get effected by this but really, it just seems high. >>> > I have not tested these, its just data I saw at mouser today while I was > ordering. I was just shocked at the leakage of the BP's compared to > polarized versions. > > I think mouser must have a miss print.. > http://www.mouser.com/ProductDetail/Nichicon/UVP1C471MPD/?qs=sGAEpiMZZMtZ1n0r9vR22doNkPAgsBxuSlC380FiEts%3d > and from the MF. > http://products.nichicon.co.jp/en/pdf/XJA043/e-vp.pdf > > Leakage looks good from the MF.
** The figures are exactly the SAME !!! Dickwad. .... Phil
On Nov 8, 4:31=A0pm, Jamie
<jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote:
> I had to buy some BP/NP caps today "16V 470Uf" and the pickings were > slim. In fact, I was looking for a Axial package of that value > and could not find any one that had stock of that type or even list it. > > =A0 =A0So I ended up getting some Radial types from "NICHICON". "CHicago > Capacitor" wanted a min or of 3k pieces at .98 etc, we only need 150 but > at least they were willing to make them. But back to what we ended up > ordering.
I do have 80 of the Nichicon 25V 470uF, they were probably less than 25 cents each. I don't know where you are looking, but these Panasonic 16V 470uF are 22 cents per 100. http://www.mouser.com/ProductDetail/Panasonic-Electronic-Components/EEU-FR1= C471/?qs=3DsGAEpiMZZMuL5UzuAmrlvB2cj%2fYM3wzy
"linnix"

I don't know where you are looking, but these Panasonic 16V 470uF are
22 cents per 100.

http://www.mouser.com/ProductDetail/Panasonic-Electronic-Components/EEU-FR1C471/?qs=sGAEpiMZZMuL5UzuAmrlvB2cj%2fYM3wzy


** Err  -   the OP was on about BP / NP caps.

    They are more expensive than polarised ones.




....  Phil


On Tue, 08 Nov 2011 20:13:01 -0500, the renowned Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:

>John S wrote: > >> On 11/8/2011 6:31 PM, Jamie wrote: >> >>> I had to buy some BP/NP caps today "16V 470Uf" and the pickings were >>> slim. In fact, I was looking for a Axial package of that value >>> and could not find any one that had stock of that type or even list it. >>> >>> So I ended up getting some Radial types from "NICHICON". "CHicago >>> Capacitor" wanted a min or of 3k pieces at .98 etc, we only need 150 but >>> at least they were willing to make them. But back to what we ended up >>> ordering. >>> >>> I notice the leakage was up around 320ua or something, isn't that >>> kind of high ? >>> >>> I am not really worried about that because of where they are being >>> used, which won't get effected by this but really, it just seems high. >>> >>> Jamie >> >> >> Hi, Jamie- >> >> How long did you test the leakage? Try allowing the cap to sit with >> applied voltage for a while and the measure. Let us know how that goes. >> >> Cheers, >> John S >> >I have not tested these, its just data I saw at mouser today while I was >ordering. I was just shocked at the leakage of the BP's compared to >polarized versions. > > I think mouser must have a miss print.. >http://www.mouser.com/ProductDetail/Nichicon/UVP1C471MPD/?qs=sGAEpiMZZMtZ1n0r9vR22doNkPAgsBxuSlC380FiEts%3d > and from the MF. >http://products.nichicon.co.jp/en/pdf/XJA043/e-vp.pdf > >Leakage looks good from the MF. > >Jamie >
Leakage for regular e-caps is 0.01 or 0.02CV. Special low leakage caps (not well stocked in North America, especially in larger sizes) are about 1/10 of that (0.002CV, frequently). Those particular BP ones are 0.03CV. Not a huge difference from the regular ones. CV is nominal capacitance * rated voltage to get leakage at rated voltage after some period of time. Typically there's also a minimum that comes into play for smaller capacitances. Actual leakage can be quite a bit lower, and varies quite a bit between different constructions and suppliers, but not so much from part to part of a given construction. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com