Monitor recapping and low ESR

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exxos
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Re: Monitor recapping and low ESR

Post by exxos » Sun Jul 18, 2021 9:06 pm

derkom wrote:
Sun Jul 18, 2021 7:04 pm
sandord wrote:
Sun Jul 18, 2021 6:01 pm
I've done a quick search at a parts store and found 4.7 µF 50V 10% ceramic caps measuring only 1.6 x 3.2 x 1.6 mm (I know, SMT). I find it hard to believe that these even smaller caps will do. But sure, specs are specs, right?
I would not expect that to be able to handle anywhere near the required current, but maybe @exxos should take this one. 8-)
What package ? 1206 or larger should be fine anyway.
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Re: Monitor recapping and low ESR

Post by Tomswork » Mon Jul 19, 2021 1:25 am

Just my two cents i would rather have a capacitor rated at 105c for 2000hr than any 85c capacitor at any hours

Tom

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Re: Monitor recapping and low ESR

Post by sandord » Mon Jul 19, 2021 11:30 am

exxos wrote:
Sun Jul 18, 2021 9:06 pm
What package ? 1206 or larger should be fine anyway.
I've looked up the dimensions of a 1206 package and it's supposed to be 3.0 x 1.5 mm so the cap I found is even a little bit larger at 3.2 x 1.6 mm.

Here's the spec sheet by the way, if you're interested:

https://asset.conrad.com/media10/add/16 ... mm-1-s.pdf

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Re: Monitor recapping and low ESR

Post by sandord » Mon Jul 19, 2021 11:32 am

Tomswork wrote:
Mon Jul 19, 2021 1:25 am
Just my two cents i would rather have a capacitor rated at 105c for 2000hr than any 85c capacitor at any hours

Tom
Yeah, I agree. These devices aren't going to run for that many hours anyway and better resiliency for the periods they will is much more important.

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Re: Monitor recapping and low ESR

Post by sandord » Mon Jul 19, 2021 11:35 am

sandord wrote:
Mon Jul 19, 2021 11:30 am
exxos wrote:
Sun Jul 18, 2021 9:06 pm
What package ? 1206 or larger should be fine anyway.
I've looked up the dimensions of a 1206 package and it's supposed to be 3.0 x 1.5 mm so the cap I found is even a little bit larger at 3.2 x 1.6 mm.

Here's the spec sheet by the way, if you're interested:

https://asset.conrad.com/media10/add/16 ... mm-1-s.pdf
I just saw the "1206" in the URL :roll: :P

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Re: Monitor recapping and low ESR

Post by sandord » Mon Jul 19, 2021 11:41 am

Just for reference, this is where I'll end up. I shopped a commercial picture of the ceramic cap into the photo, maybe it's even smaller in reality:

Untitled.jpg
Untitled.jpg (104.43 KiB) Viewed 398 times

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Re: Monitor recapping and low ESR

Post by Tomswork » Mon Jul 19, 2021 3:40 pm

Measure the pad and also check around it see if anything will short it is close to the edge or put some masking on it to insulate it

Tom

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Re: Monitor recapping and low ESR

Post by sandord » Wed Jul 21, 2021 7:57 am

Tomswork wrote:
Mon Jul 19, 2021 3:40 pm
Measure the pad and also check around it see if anything will short it is close to the edge or put some masking on it to insulate it

Tom
Thanks for the advice. If all goes well, they'll be in the mail tomorrow. I might post a picture of the final result.

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