Electronics > Repair
Seeking guidance: replacing a failed tantalum SMD capacitor
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nidlaX:
Hi all, I've found a failed (short) tantalum SMD cap as pictured that sits on a 14V power rail. I've been on Digikey and located tantalums of similar capacity / voltage / footprint, but I was wondering if you would have any guidance on how to select a suitable replacement. I'm not very familiar with the nuances, and I don't know about the ratings (reliability, ESR, etc.) of the original part since I can't identify the manufacturer and series.

Should I just grab any 100uF 16V tantalum that fits, or is there more to consider? Thanks!
mengfei:
here are some reference you can check out but if it where me i would go beyond the 16V limit of the cap



https://algotrader.app/x7r-capacitor

Kim Christensen:

--- Quote from: nidlaX on September 03, 2024, 01:00:02 am ---Should I just grab any 100uF 16V tantalum that fits, or is there more to consider? Thanks!
--- End quote ---

Pretty much. Though if I was ordering them I'd be getting more than one. Therefore, I would search for ones with a higher voltage rating that fit the footprint and buy those if they exist.
David Hess:

--- Quote from: Kim Christensen on September 03, 2024, 02:22:27 am ---
--- Quote from: nidlaX on September 03, 2024, 01:00:02 am ---Should I just grab any 100uF 16V tantalum that fits, or is there more to consider? Thanks!
--- End quote ---

Pretty much. Though if I was ordering them I'd be getting more than one. Therefore, I would search for ones with a higher voltage rating that fit the footprint and buy those if they exist.
--- End quote ---

14 volts on a 16 volt solid tantalum capacitor is not much of a derating, which likely explains the failure.  So I agree that a higher voltage part should be used.  I might also replace any other 16 volt tantalum capacitors which are also on that 14 volt rail.

Failures with 2/3 voltage derating are very unlikely.  With 1/2 voltage derating it becomes practically impossible.
nidlaX:
I appreciate all the input, and it all makes sense. Thank you!
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