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Cap leakage

J

Jamie

Jan 1, 1970
0
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
 
J

John S

Jan 1, 1970
0
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
 
J

John S

Jan 1, 1970
0
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
 
J

Jamie

Jan 1, 1970
0
John said:
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...=sGAEpiMZZMtZ1n0r9vR22doNkPAgsBxuSlC380FiEts=
and from the MF.
http://products.nichicon.co.jp/en/pdf/XJA043/e-vp.pdf

Leakage looks good from the MF.

Jamie
 
P

Phil Allison

Jan 1, 1970
0
"Jamie = Maynard A. Philbrook fuckwit radio ham.
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...=sGAEpiMZZMtZ1n0r9vR22doNkPAgsBxuSlC380FiEts=
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
 
S

Spehro Pefhany

Jan 1, 1970
0
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...=sGAEpiMZZMtZ1n0r9vR22doNkPAgsBxuSlC380FiEts=
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
 
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