Ceramic Capacitor Voltage Rating

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Hi there,

Is it safe to charge/use a 10uF X5R Ceramic 0603 surface mount capacitor (6.3V Rating) at 5V, used between -40 and 85C ?? Would this hurt the capacitor with time??

I would appreciate any comments

Jacques

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Hi,

the manufacturer will say: NO (no problem)

But I´ve seen capacitors failing in the field. Maybe this can be caused by voltage spikes above the rated voltage. (I´ve checkd this, but never seen spikes)

Now i assemble only capacitors rated about twice my supply voltage.

Klaus
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Look at: www.megausb.de (German)
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For smaller ceramics, operating at 80% of voltage rating is OK, even over temperature. For ceramics, temperature has a larger effect on value than it does on failure rate. For ceramics at 1uf and above, I would probably try to achieve slightly more derating until I have enough component experience to tell me that 80% is OK.

Tantalums are generally recommeded at 50% and are a whole different animal. Failure rate really goes up with temperature. But, you asked about ceramic, not tantalum so ignore that.

AVX (Kyocera) is a major ceramic cap manufacturer. Take a look at their X5R SMT spec sheet:

http://www.avxcorp.com/docs/Cata...

Page 13 has reliability information. One of the things to watch out for is the ripple current rating. Exceeding THAT can cause higher temperatures which will reduce reliability.

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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Joeks wrote:
Hi there,

Is it safe to charge/use a 10uF X5R Ceramic 0603 surface mount capacitor (6.3V Rating) at 5V, used between -40 and 85C ?? Would this hurt the capacitor with time??

I would appreciate any comments

Jacques

10uF 0603?
hehe
you might not want to use it at a higher ripple current, P_d 0.0625 w ...
5V is OK for them.

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Thanks for all your comments and suggestions!!

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z-matrix wrote:
Joeks wrote:
Hi there,

Is it safe to charge/use a 10uF X5R Ceramic 0603 surface mount capacitor (6.3V Rating) at 5V, used between -40 and 85C ?? Would this hurt the capacitor with time??

I would appreciate any comments

Jacques

10uF 0603?
hehe
you might not want to use it at a higher ripple current, P_d 0.0625 w ...
5V is OK for them.


wow didn't pick up on that. That's one big little cap.

On a related note to the OP - how close to the max voltage rating of an electrolytic can you safely run at? I'd like to use some 6V electrolytics on a 3.3v supply line - that should be ok right?