[time-nuts] PRS10 C900 replacement

Bob Camp kb8tq at n1k.org
Wed Jan 20 07:43:01 EST 2016


Hi


The only thing I would add to that is:

Get it from Mouser or Digi-Key. That way you have a pretty good chance of it being one
that really came from the manufacturer you think it’s coming from. You also are a lot 
less likely to get one that has been on the shelf forever and ever. 

One really strange thing about Tantalum’s: They *like* bias and temperature. The 
time you are most likely to see high leakage is when they have been power off for 
a long time. That’s another reason to want a new one …

Bob

> On Jan 20, 2016, at 1:59 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> 
> david wrote:
> 
>> It's a 2.2uF cap, with a 0.125" lead spacing, and I'm looking for 125dC temp rating. I wondered if there were other characteristics such as ESR/ESL I need to keep in mind.
> 
> You're on the right track.  Get the highest temperature rating available (which is probably 125C), buy only caps manufactured by one of the known-good manufacturers, and select from a parts series the manufacturer designates as "high reliability" (or equivalent).
> 
> If it is a solid tantalum, I like the Vishay 199D Series.  The AVX TAP Series and the Kemet "T" Series ("UltraDip II") are also high quality.  (This list isn't exhaustive -- these are just the ones I've had occasion to qualify.)
> 
> Best regards,
> 
> Charles
> 
> 
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