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 <j...@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@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
