Low dissipation factor capacitors

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Thanks,

George Herold

 

[Boris Mohar]

On Fri, 31 Oct 2008 14:07:04 -0700 (PDT), ggherold@gmail.com wrote:

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Thanks,

George Herold

Try Wima http://www.wima.de/EN/mkp2.htm
--

Boris Mohar

 

[Eeyore]

ggherold@gmail.com wrote:

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Loads of people make polypropylene caps. From experience Epcos has
possibly the largest range.

Where does one buy 'bad' polypropylene from btw ?

Graham

 

Boris Mohar wrote:

On Fri, 31 Oct 2008 14:07:04 -0700 (PDT), ggherold@gmail.com wrote:

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Thanks,

George Herold

Try Wima http://www.wima.de/EN/mkp2.htm
--

Boris Mohar

Thanks, my boss was worried there would be no other supplier.

George

 

Eeyore wrote:

ggherold@gmail.com wrote:

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Loads of people make polypropylene caps. From experience Epcos has
possibly the largest range.

Excellent! The big ones must be expensive.

Where does one buy 'bad' polypropylene from btw ?

Hmmm, I don't know. I suposse I could try rolling you some bad ones,
they'd cost though.

Graham

Thanks
George

 

[Eeyore]

ggherold@gmail.com wrote:

Eeyore wrote:
ggherold@gmail.com wrote:

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Loads of people make polypropylene caps. From experience Epcos has
possibly the largest range.

Excellent! The big ones must be expensive.

They have an astonishing range, both metallised film-foil and film-foil-film
for ultimate performance. All with detailed charts showing max dV/dt or Amps
vs freq etc.

Polypropylene caps are always a bit expensive. For cheaper try Samwha. They
look like those green dipped mylar caps but are dipped blue ? I think and they
do give some transient data. I think they designed them for TV sets.

Graham

 

[Eeyore]

ggherold@gmail.com wrote:

Boris Mohar wrote:
ggherold@gmail.com wrote:

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Try Wima http://www.wima.de/EN/mkp2.htm

Thanks, my boss was worried there would be no other supplier.

Vishay-BC (ex Philips passives) probably still do some too. The Philips range
used to include lovely 1% tolerance smaller value ones. Brilliant for
filters. Also in giveawy blue. That range was only radial though and didn't
go to high values.

Graham

 

[Eeyore]

ggherold@gmail.com wrote:

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Not to forget the British ! LCR are still making them.

http://www.lcrcapacitors.co.uk/

AND polycarbonate and polystyrene ! Must be about the last people in the
world doing that !

Graham

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:490CF35E.27BDDE72@hotmail.com:

green dipped mylar caps

In the UK we have these sweets called Tooty Frooty's.... If you have a taste
for these things (I have), and you're hungry for them while working in range
of a box of these mylar caps, be afraid, be very afraid... > It takes self
control not to want to try a nibble.

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:490BB958.664F612C@hotmail.com:

Loads of people make polypropylene caps. From experience Epcos has
possibly the largest range.

Big yellow ones with 40ľF and 900 or more volts? Got to ask because I wanted
something like that or stronger for a laser flash driver once and I never
found anything that big via Google searches.

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote

green dipped mylar caps

In the UK we have these sweets called Tooty Frooty's.... If you have a taste
for these things (I have), and you're hungry for them while working in range
of a box of these mylar caps, be afraid, be very afraid... > It takes self
control not to want to try a nibble.

LMAO !

Graham

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote

Loads of people make polypropylene caps. From experience Epcos has
possibly the largest range.

Big yellow ones with 40ľF and 900 or more volts? Got to ask because I wanted
something like that or stronger for a laser flash driver once and I never
found anything that big via Google searches.

The Epcos polypropylenes are all AFAIK in blue plastic boxes. Blue seems to be
the typical colour for polypropylene.

What was the PRR on your laser ?

Graham

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:490D7C61.88DD1C67@hotmail.com:

Lostgallifreyan wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote

Loads of people make polypropylene caps. From experience Epcos has
possibly the largest range.

Big yellow ones with 40ľF and 900 or more volts? Got to ask because I
wanted something like that or stronger for a laser flash driver once
and I never found anything that big via Google searches.

The Epcos polypropylenes are all AFAIK in blue plastic boxes. Blue seems
to be the typical colour for polypropylene.

Lots of yellow axial cylindrical ones exist for HV, and I've seen them in
passive speaker crossovers too.

What was the PRR on your laser ?

Slow. Just needed a fast pulse, shaped by a coil. It had a fat yellow
polypropylene cap, and some people reported using more oomph so I looked
around to see if suitable caps existed. Couldn't find any nig enough until I
saw the big polyethylene caps that some people in Russia were selling on
eBay. Expensive, and slow to ship, and massively overpowered for a small
rangefinder YAG.

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore wrote
Lostgallifreyan wrote:
Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote

Loads of people make polypropylene caps. From experience Epcos has
possibly the largest range.

Big yellow ones with 40ľF and 900 or more volts? Got to ask because I
wanted something like that or stronger for a laser flash driver once
and I never found anything that big via Google searches.

The Epcos polypropylenes are all AFAIK in blue plastic boxes. Blue seems
to be the typical colour for polypropylene.

Lots of yellow axial cylindrical ones exist for HV, and I've seen them in
passive speaker crossovers too.

Those sound more like polyester to me. No need ever for polypropylenes in an
audio crossover. Can you give me some series numbers ?

What was the PRR on your laser ?

Slow.

How slow ?

Just needed a fast pulse, shaped by a coil. It had a fat yellow
polypropylene cap, and some people reported using more oomph so I looked
around to see if suitable caps existed. Couldn't find any nig enough until I
saw the big polyethylene caps that some people in Russia were selling on
eBay. Expensive, and slow to ship, and massively overpowered for a small
rangefinder YAG.

Photograhic high power flash units simply use purpose designed electrolytics
designed for ultra-fast discharge. About 1000uF @ 320V !

Graham

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:490DAA49.A91DD4C1@hotmail.com:

Lostgallifreyan wrote:

Eeyore wrote
Lostgallifreyan wrote:
Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote

Loads of people make polypropylene caps. From experience Epcos has
possibly the largest range.

Big yellow ones with 40ľF and 900 or more volts? Got to ask because
I wanted something like that or stronger for a laser flash driver
once and I never found anything that big via Google searches.

The Epcos polypropylenes are all AFAIK in blue plastic boxes. Blue
seems to be the typical colour for polypropylene.

Lots of yellow axial cylindrical ones exist for HV, and I've seen them
in passive speaker crossovers too.

Those sound more like polyester to me. No need ever for polypropylenes
in an audio crossover. Can you give me some series numbers ?

Want to bet? Can't give you numbers but Google image results alone throw them
out ten at a time in various contexts, especially in audio. (Most times I see
polyesters, they're in mains filters or cheap timing circuits for small
signals).

http://www.allproducts.com/ee/livingston/13-capacitors_print.html
http://www.octave-electronics.com/Parts/capacitors.shtml
http://www.corrson.com/crossover.html
http://www.audiocircle.com/circles/index.php?topic=54218.140
http://www.b2bcapacitor.com/products/mpa-capacitor.htm

What was the PRR on your laser ?

Slow.

How slow ?


Just needed a fast pulse, shaped by a coil. It had a fat yellow
polypropylene cap, and some people reported using more oomph so I
looked around to see if suitable caps existed. Couldn't find any nig
enough until I saw the big polyethylene caps that some people in Russia
were selling on eBay. Expensive, and slow to ship, and massively
overpowered for a small rangefinder YAG.

Photograhic high power flash units simply use purpose designed
electrolytics designed for ultra-fast discharge. About 1000uF @ 320V !

Not the same. Flashlamps for small YAG laser pumping can work, sort of, with
photoflash, people do that, but it's not good design, it doesn't give the
well-controlled pulse needed, and that's done with a polypropylene (or
polyethylene) cap and a pulse shaping coil.

 

[Andre Majorel]

On 2008-11-02, Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:

ggherold@gmail.com wrote:

We use the Panosonic P-series caps for their low dissipation
factor in a bunch of high Q filter circuits. The dissipation
factor is quoted as 0.1% at 1kHz. Is there another supplier
of 'good' polypropylene capacitors? Or is Panasonic making a
replacement part. (I fired off an email to Panasonic but
don't expect to hear back till Monday.

Not to forget the British ! LCR are still making them.

http://www.lcrcapacitors.co.uk/

AND polycarbonate and polystyrene ! Must be about the last
people in the world doing that !

Doing polystyrene caps ? Well, Mouser sell cheap ones under
their "Xicon" house brand. Their published C vs. temp curves
don't look as good as the figures on LCR's data sheets, though.

--
André Majorel <URL:http://www.teaser.fr/~amajorel/>
You measure democracy by the freedom it gives its dissidents, not
the freedom it gives its assimilated conformists -- Abbie Hoffman.

 

[Eeyore]

Andre Majorel wrote:

Eeyore wrote:
ggherold@gmail.com wrote:

We use the Panosonic P-series caps for their low dissipation
factor in a bunch of high Q filter circuits. The dissipation
factor is quoted as 0.1% at 1kHz. Is there another supplier
of 'good' polypropylene capacitors? Or is Panasonic making a
replacement part. (I fired off an email to Panasonic but
don't expect to hear back till Monday.

Not to forget the British ! LCR are still making them.

http://www.lcrcapacitors.co.uk/

AND polycarbonate and polystyrene ! Must be about the last
people in the world doing that !

Doing polystyrene caps ? Well, Mouser sell cheap ones under
their "Xicon" house brand. Their published C vs. temp curves
don't look as good as the figures on LCR's data sheets, though.

Polystyrene caps are as rare as hen's teeth now. LCR say the film is no
longer made but they've got stock for something like 15 yrs production at
current rates.

Graham

 

Eeyore wrote:

ggherold@gmail.com wrote:

Boris Mohar wrote:
ggherold@gmail.com wrote:

I've just learned that Panasonic is obsolecsing a whole bunch of their
capacitors. (Production has been getting emails from digikey for a
while but told me about it at today.)
We use the Panosonic P-series caps for their low dissipation factor in
a bunch of high Q filter circuits. The dissipation factor is quoted
as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
capacitors? Or is Panasonic making a replacement part. (I fired off
an email to Panasonic but don't expect to hear back till Monday.

Try Wima http://www.wima.de/EN/mkp2.htm

Thanks, my boss was worried there would be no other supplier.

Vishay-BC (ex Philips passives) probably still do some too. The Philips range
used to include lovely 1% tolerance smaller value ones. Brilliant for
filters. Also in giveawy blue. That range was only radial though and didn't
go to high values.

Graham

"include lovely 1% tolerance smaller value ones. Brilliant for
filters. "

Wonderful! I've been using 2% tolerance caps from Panasonic and had
ordered some of their new 1% ones for a new filter design. I was
looking forward ~1% 'out of the box' performance.

George