Is it ok to use higher voltage caps if the uF rating is the same?

Generally speaking, yes, not a problem.
For more specialised applications (like say a low ESR capacitor in a
SMPS) you have to be more careful when substituting caps.

Dave :)

: >
: > Is it ok to use caps that are a higher voltage than the circuit
states
: > providing that they are the same uF rating?
:
: Generally speaking, yes, not a problem.\

: For more specialised applications (like say a low ESR capacitor in a
: SMPS) you have to be more careful when substituting caps.


the answer is yes
and even a higher uF rating is ok in a lot of apps

ESR is generally a function of case size....



"usually" is a better answer



sometimes caps are chosen for their high ESR. bung a big fat X7R cap on
the output of an LP3961 LDO regulator, and you'll see what I mean.

If the equipment doesnt have to run at very low temperatures, I often
use high-ESR electrolytics to damp LC filters....

Cheers
Terry

"Terry Given"



**  Huh  ??

All the low ESR electos I see advertised are in the same or even smaller
case sizes than their regular counterparts.

Low ESR in a electro is a predominantly function of the electrolyte used -
ie must have very high conductivity.




........  Phil

Sorry Phil, I should have added "for a given electrolyte".

If I use a Nichicon PS series cap as an example, see:

http://www.nichicon.co.jp/english/seihin/pdfs/e-ps.pdf

then you'll see that all the 5x11 case size caps from 22uF 6.3V to 33uF
35V have the same ESR.

actually, when the cap voltage gets over 35V the ESR goes up for a given
case size, but the relation holds tru for a 5:1 range of cap voltage.
not bad for a ROT.

So for a given chemistry, if you want less ESR you need a bigger cap.

Cheers
Terry

"Terry Given"



**  You should then also add that your comment was  **hypothetical**.

You have a very bad habit, Terry of shifting context and moving the
goalposts without TELLING  ANY  ONE !




** Sure -   as if  WES et alia offer 47 uF, 35 volt electos in a whole bunch
of quite different case sizes.

    Like Hell.



.......  Phil

its not hypothetical at all. thats why I gave the datasheet link.



?!



smt & leaded....

never heard of WES. If you spend $1,000,000 with Hitachi AIC, they will
make you any cap you like.


A United Chemi-Con LXZ series 6.3V 1200uF cap comes in 2 case sizes:

case      ESR      Ripple current
8x20      0.080    810mA
10x16     0.068    1050mA

QED






Cheers
Terry

"Terry Given"  =  yet another Kiwi mental defective  .......



**  It was hypothetical to the particular issue YOU  were commenting on  -
fuckwit .






 **  You are one, dangerous bloody  IDIOT -   Terry.






**  Insanity -   pure bloody insanity.





**  Never heard of reality either.





**  Insanity - pure bloody insanity.

  Your pet sheep are missing you  -  Terry.

  Baaaaaaaaaaaaaaaahhhhhhhhhhhhhhh.....




...........  Phil

David

message




 **  What the HELL  are you doing with your newsreader ??

The above quotes no poster by name,  has no context, looks like it is itself
a quote and moreover reads like a dumb troll.

Maybe "confidential counselling " is just what YOU need.




.........  Phil

Well gee Phil, seems like you are getting your little knickers in a knot again
- but I guess you just forgot to read the heading of the post I replied to - if
you read that really really carefully my post makes lots of sense, well at
least to those with common sense and good manners.

Do try to be nice Phil - it doesn't hurt and you wouldn't make such an idiot of
yourself

David - who really doesn't care what Phil writes but enjoys poking him with a
(verbal) stick now and again just for fun

Phil Allison wrote:

"quietguy"   =  top posting , non quoting wanker







** It is not possible to know what post you replied to as you did not QUOTE
any of it !!

     Flys in the face of basic usenet etiquette.





**  Never said it was nonsense -  I said it was a TROLL.

  When you post UNDER people's actual words such misconstructions are
avoided.





** Leaves  YOU  out  -  doesn't it ?





** When you post UNDER people's words and about the thoughts expressed
therein such misconstructions are avoided.





**  Err -   David  -  who really does not care about anything much at all.


  BTW

   Screwed any of you tenants lately ??



...........  Phil

Just the female ones Phil - I can save their pets for you if you ask me nicely

David - who wonders how Phil ever gets his knickers unknotted

Phil Allison wrote:

...and you are so bigoted that you wouldn't have a relationship with an
aboriginal lady Dill?  (whoops I meant to write Phil)

David - who likes (most) aboriginal people

Phil Allison wrote:

"quietguy"



 **  QED.


(  That was simple and efficient ......  )



.........   Phil

I see you haven't moved since last time we were in contact, David!
Watch out for those rogue technicians who sabotage coffee mugs...

Bob


On Wed, 07 Dec 2005 11:56:18 GMT, quietguy

...and may the great glue God visit YOUR coffee cup handle.....

David

PS Hope you have a great Christmas Bob, and your New Year is filled with good
health, love, and peace

Bob Parker wrote:

  You know what they say David, you gotta stick with your mates!!
Season's greetings to you, and best wishes for next year and very many
after that.

Rgds
Bob


On Wed, 07 Dec 2005 22:58:44 GMT, quietguy

"David" <




 **  In some cases definitely *** NO*** .

   What is your application ?



...........  Phil