Typical ESR values

D

Dishum

Guest
I'm a hobbyist who doesn't have an ESR meter or (usually) a
choice of specific capacitor models and I'd like to have some
idea of the kind of ESR values one would expect from capacitors
that are neither particularly good nor particularly crappy in
that respect. I'll really appreciate it if you could cite some
ballpark figures for -

1. 1uF/50V wet Al electrolytic
2. 100uF/25V wet Al electrolytic
3. 1000uF/50V wet Al electrolytic
4. 1uF/25V tantalum
 
"Dishum"
I'm a hobbyist who doesn't have an ESR meter or (usually) a choice of
specific capacitor models and I'd like to have some idea of the kind of
ESR values one would expect from capacitors that are neither particularly
good nor particularly crappy in that respect. I'll really appreciate it if
you could cite some ballpark figures for -

1. 1uF/50V wet Al electrolytic
2. 100uF/25V wet Al electrolytic
3. 1000uF/50V wet Al electrolytic
4. 1uF/25V tantalum
Click to expand...

** Measured from my parts bins:

1 = 3.1 ohms
2 = 0.5 ohms
3 = 0.06 ohms
4 = 4.2 ohms

In each case, the figure is for high frequency ESR or impedance at 100kHz.

ESR rises at low frequencies ( under 500Hz ) and falls with increasing
temperature.

Also, when an electro goes bad (ie dries out ) - ESR rises first followed
much later by a reduction in actual uF.



.... Phil
 
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:9o7bokFmgmU1@mid.individual.net...
"Dishum"

I'm a hobbyist who doesn't have an ESR meter or (usually) a
choice of specific capacitor models and I'd like to have some
idea of the kind of ESR values one would expect from
capacitors that are neither particularly good nor particularly
crappy in that respect. I'll really appreciate it if you could
cite some ballpark figures for -

1. 1uF/50V wet Al electrolytic
2. 100uF/25V wet Al electrolytic
3. 1000uF/50V wet Al electrolytic
4. 1uF/25V tantalum


** Measured from my parts bins:

1 = 3.1 ohms
2 = 0.5 ohms
3 = 0.06 ohms
4 = 4.2 ohms

In each case, the figure is for high frequency ESR or impedance
at 100kHz.

ESR rises at low frequencies ( under 500Hz ) and falls with
increasing temperature.

Also, when an electro goes bad (ie dries out ) - ESR rises
first followed much later by a reduction in actual uF.


Thanks a lot.
Click to expand...
 
"Dishum"
"Phil Allison"
"Dishum"

I'm a hobbyist who doesn't have an ESR meter or (usually) a choice of
specific capacitor models and I'd like to have some idea of the kind of
ESR values one would expect from capacitors that are neither
particularly good nor particularly crappy in that respect. I'll really
appreciate it if you could cite some ballpark figures for -

1. 1uF/50V wet Al electrolytic
2. 100uF/25V wet Al electrolytic
3. 1000uF/50V wet Al electrolytic
4. 1uF/25V tantalum


** Measured from my parts bins:

1 = 3.1 ohms
2 = 0.5 ohms
3 = 0.06 ohms
4 = 4.2 ohms

In each case, the figure is for high frequency ESR or impedance at
100kHz.

ESR rises at low frequencies ( under 500Hz ) and falls with increasing
temperature.

Also, when an electro goes bad (ie dries out ) - ESR rises first
followed much later by a reduction in actual uF.


Thanks a lot.
Click to expand...

** Thank you for a refreshingly clear question.




..... Phil
 
On Tue, 24 Jan 2012 20:25:32 +1100, "Phil Allison" <phil_a@tpg.com.au>
wrote:

"Dishum"

I'm a hobbyist who doesn't have an ESR meter or (usually) a choice of
specific capacitor models and I'd like to have some idea of the kind of
ESR values one would expect from capacitors that are neither particularly
good nor particularly crappy in that respect. I'll really appreciate it if
you could cite some ballpark figures for -

1. 1uF/50V wet Al electrolytic
2. 100uF/25V wet Al electrolytic
3. 1000uF/50V wet Al electrolytic
4. 1uF/25V tantalum


** Measured from my parts bins:

1 = 3.1 ohms
2 = 0.5 ohms
3 = 0.06 ohms
4 = 4.2 ohms

In each case, the figure is for high frequency ESR or impedance at 100kHz.

ESR rises at low frequencies ( under 500Hz ) and falls with increasing
temperature.

Also, when an electro goes bad (ie dries out ) - ESR rises first followed
much later by a reduction in actual uF.



... Phil
Click to expand...
That seems high for the tantalum. I seem to recall numbers like a
couple tenths of an ohm. I'll try a couple. I don't have an ESR meter,
but I can just apply a square wave from a 50 ohm generator and scope
the voltage.

Hmmm, both of the 1u caps have about the same ESR.

John
 
"John Larkin"
"Phil Allison"
"Dishum"

I'm a hobbyist who doesn't have an ESR meter or (usually) a choice of
specific capacitor models and I'd like to have some idea of the kind of
ESR values one would expect from capacitors that are neither
particularly
good nor particularly crappy in that respect. I'll really appreciate it
if
you could cite some ballpark figures for -

1. 1uF/50V wet Al electrolytic
2. 100uF/25V wet Al electrolytic
3. 1000uF/50V wet Al electrolytic
4. 1uF/25V tantalum


** Measured from my parts bins:

1 = 3.1 ohms
2 = 0.5 ohms
3 = 0.06 ohms
4 = 4.2 ohms

In each case, the figure is for high frequency ESR or impedance at 100kHz.

ESR rises at low frequencies ( under 500Hz ) and falls with increasing
temperature.

Also, when an electro goes bad (ie dries out ) - ESR rises first followed
much later by a reduction in actual uF.



That seems high for the tantalum. I seem to recall numbers like a
couple tenths of an ohm.
Click to expand...

See page 5:

http://www.farnell.com/datasheets/33794.pdf

For a 1uF example at 25V or 35V, ESR values of 8 to10 ohms are quoted.



.... Phil
 
On Wed, 25 Jan 2012 09:42:50 +1100 "Phil Allison" <phil_a@tpg.com.au>
wrote in Message id: <9o8qfjFtp1U1@mid.individual.net>:

"John Larkin"
"Phil Allison"
"Dishum"

I'm a hobbyist who doesn't have an ESR meter or (usually) a choice of
specific capacitor models and I'd like to have some idea of the kind of
ESR values one would expect from capacitors that are neither
particularly
good nor particularly crappy in that respect. I'll really appreciate it
if
you could cite some ballpark figures for -

1. 1uF/50V wet Al electrolytic
2. 100uF/25V wet Al electrolytic
3. 1000uF/50V wet Al electrolytic
4. 1uF/25V tantalum


** Measured from my parts bins:

1 = 3.1 ohms
2 = 0.5 ohms
3 = 0.06 ohms
4 = 4.2 ohms

In each case, the figure is for high frequency ESR or impedance at 100kHz.

ESR rises at low frequencies ( under 500Hz ) and falls with increasing
temperature.

Also, when an electro goes bad (ie dries out ) - ESR rises first followed
much later by a reduction in actual uF.



That seems high for the tantalum. I seem to recall numbers like a
couple tenths of an ohm.


See page 5:

http://www.farnell.com/datasheets/33794.pdf

For a 1uF example at 25V or 35V, ESR values of 8 to10 ohms are quoted.
Click to expand...
I thought the same thing that JL did, so taking a look at Digikey:
http://search.digikey.com/scripts/DkSearch/dksus.dll?x=0&y=0&lang=en&site=us&KeyWords=1uf+25v+tantalum
7.5 to 8 ohms.
 
On Wed, 25 Jan 2012 05:53:25 -0500 JW <none@dev.null> wrote in Message id:
<amnvh71uc445lvmju4pdirorb4a78a01le@4ax.com>:

On Wed, 25 Jan 2012 09:42:50 +1100 "Phil Allison" <phil_a@tpg.com.au
wrote in Message id: <9o8qfjFtp1U1@mid.individual.net>:


"John Larkin"
"Phil Allison"
"Dishum"

I'm a hobbyist who doesn't have an ESR meter or (usually) a choice of
specific capacitor models and I'd like to have some idea of the kind of
ESR values one would expect from capacitors that are neither
particularly
good nor particularly crappy in that respect. I'll really appreciate it
if
you could cite some ballpark figures for -

1. 1uF/50V wet Al electrolytic
2. 100uF/25V wet Al electrolytic
3. 1000uF/50V wet Al electrolytic
4. 1uF/25V tantalum


** Measured from my parts bins:

1 = 3.1 ohms
2 = 0.5 ohms
3 = 0.06 ohms
4 = 4.2 ohms

In each case, the figure is for high frequency ESR or impedance at 100kHz.

ESR rises at low frequencies ( under 500Hz ) and falls with increasing
temperature.

Also, when an electro goes bad (ie dries out ) - ESR rises first followed
much later by a reduction in actual uF.



That seems high for the tantalum. I seem to recall numbers like a
couple tenths of an ohm.


See page 5:

http://www.farnell.com/datasheets/33794.pdf

For a 1uF example at 25V or 35V, ESR values of 8 to10 ohms are quoted.

I thought the same thing that JL did, so taking a look at Digikey:
http://search.digikey.com/scripts/DkSearch/dksus.dll?x=0&y=0&lang=en&site=us&KeyWords=1uf+25v+tantalum
7.5 to 8 ohms.
Click to expand...
Sorting by ESR there's some as high as 20 ohms!
 
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