[time-nuts] PRS10 C900 replacement

Bob Camp kb8tq at n1k.org
Wed Jan 20 18:00:11 EST 2016


Hi

Tantalums can benefit from a 1K resistor sort of “rebuild”. On any part made 
in the last 30 years by a major outfit, it should not be required. 

Moisture is sort of a weird issue. Epoxy and humidity do strange things. Getting
it back out is not easy. It also combines with the “guts” of the part. The failure 
mechanism is not the same as soldering a SMD part that has been out in 
the wet world longer than it should have been.

Bob

> On Jan 20, 2016, at 9:27 AM, Clint Jay <cjaysharp at gmail.com> wrote:
> 
> Do tantalum then benefit from being 'reformed'  in a similar fashion to wet
> electrolytics?
> 
> Do they recover from moisture ingress by baking in a similar fashion to SMD
> chips that have been stored incorrectly?
> On 20 Jan 2016 14:10, "Bob Camp" <kb8tq at n1k.org> wrote:
> 
>> 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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