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Old 10th December 2010, 11:00 PM   #681
massimo is offline massimo  Italy
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Location: Milan, Italy
Quote:
Originally Posted by Horio View Post
When I click the first link, I'm seeing a 25V 22uF TS-HA Cap. Shows an operating temp up to 105C with a 30mm diameter. You sure you aren't looking at the 35V TS-HA?
DOH!
You're right! 1st link TSHA 22mF/25V d 30mm, 2nd link TS-UP 22mF/35V d 30mm (same value but TS-HA d 35mm I have some pieces on my desk)
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Old 11th December 2010, 02:48 AM   #682
EUVL is offline EUVL  Europe
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Sometimes it's worth looking carefully first.

There is no reason to have to have TS-HA.
Some 85C caps lives very long, unless you are listening to music over 8 hours everyday.
And the two ends of the heatsink are hardly over 50C, near to which is the caps are placed, to the immediate left & right of the main PCB.

Take a look at the lifetime specified for e.g. Vishay BC 056 series (85C) :

VISHAY BC COMPONENTS|2222 056 46223.|CAPACITOR, 22000UF 25V | Farnell United Kingdom
http://www.farnell.com/datasheets/15301.pdf

"Useful life 85C 12000 hrs."
"Useful life 40C 210000 hrs."


For EPCOS, you may choose B41231A5339M000 :
https://www.buerklin.com/datenblaetter/D097790_TD.pdf
http://www2.mouser.com/ProductDetail...zkPvoelrzp0%3d

which is 33000uF and has one of the highest ripple current at 120Hz that I have seen for that size.


Patrick

.

Last edited by EUVL; 11th December 2010 at 02:54 AM.
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Old 11th December 2010, 08:48 AM   #683
EUVL is offline EUVL  Europe
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The above link to Mouser is incorrect (wrong voltage).
This is the correct one :

EPCOS|B41231A5339M000|KONDENSATOR,SNAP-IN,25V,33000UF | Farnell Deutschland


Patrick
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Old 11th December 2010, 09:11 AM   #684
EUVL is offline EUVL  Europe
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At a glance.
Feel free to propose more alternatives.


Patrick
Attached Images
File Type: jpg F5X Cap.jpg (29.3 KB, 396 views)
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Old 11th December 2010, 07:36 PM   #685
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Nippon Chemicon KMH
EKMH250VSN223MR45S
Ripple Current 4.04A at 105 degrees C

Last edited by Melon Head; 11th December 2010 at 07:45 PM.
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Old 11th December 2010, 07:49 PM   #686
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by EUVL View Post

"Useful life 85C 12000 hrs."
"Useful life 40C 210000 hrs."

question is, are 105 C any better than 85 C, if temperature stays below 60 C at all times

but BC 105 C have slightly larger diameter than 85 C

are they double shielded, or is it because they hold more electrolytic, or both ?
is it about cooling, or purely chemical, or both ?
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Old 11th December 2010, 07:51 PM   #687
EUVL is offline EUVL  Europe
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Digi-Key - 565-2861-ND (Manufacturer - EKMH250VSN223MR45T)
Ripple current 4.04A.


Patrick
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Old 11th December 2010, 07:53 PM   #688
EUVL is offline EUVL  Europe
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I have good experience with BC 056, so I would not hesistate to use them again.
But on pure spec., the EPCOS is quite impressive. And it is 33000uF.


Patrick
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Old 12th December 2010, 07:12 PM   #689
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Quote:
Originally Posted by tinitus View Post
question is, are 105 C any better than 85 C, if temperature stays below 60 C at all times

but BC 105 C have slightly larger diameter than 85 C

are they double shielded, or is it because they hold more electrolytic, or both ?
is it about cooling, or purely chemical, or both ?
My friends that work at boeing, say "never use 85 degree caps for power supplies". They are constantly pulling out failed 85 degree caps and replacing them with 105 degree parts.
They have never had to replace a 105 degree rated cap (except in the case where the caps were over 20 years old).

The rated capacitance also tends to drop more with heat in the 85 degree parts.

If you can get them cheap I wouldn't hesitate in using them but if the price difference is small go for the 105 degree parts.
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Old 12th December 2010, 10:27 PM   #690
EUVL is offline EUVL  Europe
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Doesn't that depends on the temperature that the caps will see in its service ?

For industrial applications (e.g. automotive) where 80C ambient is not unusual, I can image that it makes a real difference.
But in our case, it hardly sees 55C ....

Anyway, plenty of choices for the same standard size.


Patrick
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