Any bad capacitor brands?

C

Chris Carlen

Guest
Hi:

Of the following, are there any to be avoided or can one reasonably
expect no meaningful differences in quality:

Ceramic through-hole and SMD chip monolithic COG and X7R capacitors:

Vishay
Epcos
BC
Panasonic


???


Thanks.




--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
crcarleRemoveThis@BOGUSsandia.gov
NOTE, delete texts: "RemoveThis" and "BOGUS" from email address to reply.
 
Chris Carlen wrote:
Hi:

Of the following, are there any to be avoided or can one reasonably
expect no meaningful differences in quality:

Ceramic through-hole and SMD chip monolithic COG and X7R capacitors:

Vishay
Epcos
BC
Panasonic
Click to expand...
Oh these too:

Kemet
AVX
Mallory


Any favorites? Any votes for "worst stinkin' capacitor ever made?"



Good day!



--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
crcarleRemoveThis@BOGUSsandia.gov
NOTE, delete texts: "RemoveThis" and "BOGUS" from email address to reply.
 
I read in sci.electronics.design that Chris Carlen <crcarleRemoveThis@BO
GUSsandia.gov> wrote (in <d0q98f068a@news1.newsguy.com>) about 'Any bad
capacitor brands?--Addendum', on Thu, 10 Mar 2005:

Any votes for "worst stinkin' capacitor ever made?"
Click to expand...
Polystyrene caps are well-known for not tolerating raised temperatures,
but in the 1970s we had some that melted if you stared at them. We also
had a number of brands of elco that should not have existed.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
Any favorites? Any votes for "worst stinkin' capacitor ever made?"
Click to expand...
Yea, dont use those wax coated paper ones. They drip all over the place
when the tubes get too hot.


--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm
 
"Luhan Monat" <x@y.z> wrote in message
news:4o8Yd.4052$uk7.3836@fed1read01...
Any favorites? Any votes for "worst stinkin' capacitor ever made?"


Yea, dont use those wax coated paper ones. They drip all over the place
when the tubes get too hot.
Click to expand...
How about those oil-filled ones containing carcinogic PCBs?

Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller
 
I read in sci.electronics.design that Leon Heller
<leon_heller@hotmail.com> wrote (in <42316b77$0$10943$cc9e4d1f@news-
text.dial.pipex.com>) about 'Any bad capacitor brands?--Addendum', on
Fri, 11 Mar 2005:
"Luhan Monat" <x@y.z> wrote in message
news:4o8Yd.4052$uk7.3836@fed1read01...



Any favorites? Any votes for "worst stinkin' capacitor ever made?"


Yea, dont use those wax coated paper ones. They drip all over the place
when the tubes get too hot.

How about those oil-filled ones containing carcinogic PCBs?

Well, you aren't supposed to take them apart. While sealed in the cans.
Click to expand...
they are quite safe.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
John Woodgate wrote:

I read in sci.electronics.design that Leon Heller
leon_heller@hotmail.com> wrote (in <42316b77$0$10943$cc9e4d1f@news-
text.dial.pipex.com>) about 'Any bad capacitor brands?--Addendum', on
Fri, 11 Mar 2005:

"Luhan Monat" <x@y.z> wrote in message
news:4o8Yd.4052$uk7.3836@fed1read01...


Any favorites? Any votes for "worst stinkin' capacitor ever made?"


Yea, dont use those wax coated paper ones. They drip all over the place
when the tubes get too hot.

How about those oil-filled ones containing carcinogic PCBs?


Well, you aren't supposed to take them apart. While sealed in the cans.
they are quite safe.
Click to expand...
After they explode, they are not so safe - it happens!

--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm
 
I read in sci.electronics.design that Luhan Monat <x@y.z> wrote (in
<UOhYd.4082$uk7.1106@fed1read01>) about 'Any bad capacitor brands?--
Addendum', on Fri, 11 Mar 2005:

After they explode, they are not so safe - it happens!
Click to expand...
What danger are they in? (;-)
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
On Fri, 11 Mar 2005 14:50:55 +0000, John Woodgate wrote:

I read in sci.electronics.design that Luhan Monat <x@y.z> wrote (in
UOhYd.4082$uk7.1106@fed1read01>) about 'Any bad capacitor brands?--
Addendum', on Fri, 11 Mar 2005:

After they explode, they are not so safe - it happens!

What danger are they in? (;-)
Click to expand...
Yeah - I thought that the big selling point for PCBs was that they
don't burn well.

Thanks,
Rich
 
Chris Carlen wrote:
Chris Carlen wrote:

Hi:

Of the following, are there any to be avoided or can one reasonably
expect no meaningful differences in quality:

Ceramic through-hole and SMD chip monolithic COG and X7R capacitors:

Vishay
Epcos
BC
Panasonic


Oh these too:

Kemet
AVX
Mallory


Any favorites? Any votes for "worst stinkin' capacitor ever made?"



Good day!
Click to expand...
I have had problems with no-name 100nF 25V caps going short in 5V
systems. As have companies I work for. I have also seen a wide variety
of really shitty electrolytic capacitors - I once debugged a TL431 5V
reference that was oscillating, due to the 27 Ohms ESR of the 10uF 16V
cap we picked (at random). Yep, 27 Ohms at room temperature.

For electrolytic caps, I do the following:

1) always buy 105C rated caps - crappy caps often dont even have a
temperature rating marked on them.

2) if they dont specify ripple & ESR, dont buy them

3) stick to a small number of known-good manufacturers.

Japanese caps are great - nichicon, hitachi AIC, nippon/united chemicon.
BC caps are fairly crap (wrt specs) by comparison

4) always obey rule 3, especially for smt parts - Rs, Cs etc.

Cheers
Terry
 
Terry Given wrote:
For electrolytic caps, I do the following:

1) always buy 105C rated caps - crappy caps often dont even have a
temperature rating marked on them.

2) if they dont specify ripple & ESR, dont buy them

3) stick to a small number of known-good manufacturers.

Japanese caps are great - nichicon, hitachi AIC, nippon/united chemicon.
BC caps are fairly crap (wrt specs) by comparison

4) always obey rule 3, especially for smt parts - Rs, Cs etc.
Click to expand...
I've been sticking with Panasonic FC electrolytics.

You don't like BC eh? I wonder about their ceramic mono caps?

How about Epcos and Vishay?


Good day!



--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
crcarleRemoveThis@BOGUSsandia.gov
NOTE, delete texts: "RemoveThis" and "BOGUS" from email address to reply.
 
Chris Carlen wrote:

I've been sticking with Panasonic FC electrolytics.
(snip)
Click to expand...

Have you seen their new FM series? They have about half the ESR,
almost twice the ripple current rating and for less money. They don't
yet come in as wide a range of sizes, though. I swapped some FC for
FM in a switching regulator, recently, with a nice improvement in
performance.

--
John Popelish
 
Chris Carlen wrote:
Terry Given wrote:

For electrolytic caps, I do the following:

1) always buy 105C rated caps - crappy caps often dont even have a
temperature rating marked on them.

2) if they dont specify ripple & ESR, dont buy them

3) stick to a small number of known-good manufacturers.

Japanese caps are great - nichicon, hitachi AIC, nippon/united
chemicon. BC caps are fairly crap (wrt specs) by comparison

4) always obey rule 3, especially for smt parts - Rs, Cs etc.


I've been sticking with Panasonic FC electrolytics.

You don't like BC eh? I wonder about their ceramic mono caps?
Click to expand...
Only because every time I check their electrolytics are way behind the
Japanese in terms of ripple current, ESR and lifetime. Other than that,
they make great stuff and I often use their discretes.

How about Epcos and Vishay?
Click to expand...
good and good (albeit often expensive).

I once had some 0.1% Vishay leaded parts that were +/-15%. We weren't
using many Vishay parts, but their response was *fantastic* - within a
week I had a 20 page report, with SEM pic's of the materials involved, a
detailed description of what went wrong and why, how many parts were
affected, how they modified the production process to detect/obviate the
cause etc. And we got a whole bunch of replacement parts free of charge.

Good day!
Click to expand...
Cheers
Terry
 
They haven't been made in 30 years, at least not in the
western would.


On Fri, 11 Mar 2005 09:57:11 -0000, "Leon Heller"
<leon_heller@hotmail.com> wrote:

"Luhan Monat" <x@y.z> wrote in message
news:4o8Yd.4052$uk7.3836@fed1read01...



Any favorites? Any votes for "worst stinkin' capacitor ever made?"


Yea, dont use those wax coated paper ones. They drip all over the place
when the tubes get too hot.

How about those oil-filled ones containing carcinogic PCBs?

Leon
Click to expand...
 
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