[time-nuts] FE-5680A - Newbie capacitor question

[Bob kb8tq]

Hi

The only way to work out what you have is to find the data sheet on that part. It *should* translate 
between the manufacturer’s markings and the exact part number. That part number will tell you as
much as can be known about the part. Some data sheets are a lot more complete than others. 

There is no risk (other than financial) in putting a 5% part in place of a 20%. There also is very little
risk in going for the low(er) ESR.  

If the part is just a bypass, even the value is a bit open. If the cap is in a filter or on the output of a switcher,
things may be a bit tighter.

Bob

> On May 1, 2020, at 5:42 PM, John Bievenour <john at bvnhr.net> wrote:
> 
> I'm an amateur electronics hobbyist who's still a newbie (especially to SMD), so please forgive the basic question.
> 
> I recently acquired a FE-5680A that was failing to lock on frequency (pin 3 never went low). It will power up, sweep up and down, and finally settle to fluctuate around 9.9999999 to 10.0000000.
> 
> When I opened the case, I found that one of the capacitors had blown, which I believe might be the reason. Looking at the top of the board, with the DB9 on your left, the capacitor in question directly across from the right hand 2941 voltage regulator. It has 105 on the first row, 35 followed by a stylized K on the second row, and 333 on the last row.
> 
> I'd like to attempt to replace the blown cap. After doing lots of searching and reading, I'm pretty sure this is a Kemet 35 VDC 1uF SMD Tantalum Capacitor (never knew these existed until yesterday). I've narrowed down the options on Mouser, but I can't figure out:
> 
> 1) is my identification correct?
> 2) is it a T489, T491, T494, T495, T496, T498, or T499 (the band at the top makes me think it's a T498, T491, T494, T495, T498, or a T499) ?
> 3) is the tolerance 10% or 20% (I think it's 10%)?
> 4) what is the ESR (I have options from 1 Ohm to 83 mOhms)?
> 5) for future reference, how am I able to tell the tolerance, ESR, and series just by decoding the writing on it?
> 
> Thank you very much in advance.
> - John
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.