I was reading some papers by Alexander Teverovsky, a NASA researcher. He has extensively investigated tantalum capacitor failure mechanisms, and there seem to be several of them, including stuff that

I suspect that the droplet type may be hygroscopic. The MIL spec ones tend to be of the sealed metal can type, probably for a good reason. ---In TekScopes@..., <tekscopes@...>

(5.6-4.7)/4.7 -> 0.19 i.e. 19%. One could then use a (selected) 5.6uF X7R and forget about both the capacity/voltage and capacity/time characteristics of this dielectric. You would start at about 15-2

Mhh what would be the capacitance of that 4.7u tantalum when the scope is approaching the speed of light lol. ---In TekScopes@..., <tekscopes@...> wrote: The resistance you mea

I guess we're too young for that. Give'm some 20-30 years. >>>Has anyone seen a failure of any of the solid SMD electrolytic capacitors?

Well my personal take on it is that "there are no well explained age related failure modes for solid tantalum...". If there weren't any aging phenomenons at all, then these caps would not start to fai

Unfortunately this property has not been proved in practice :-) Let's remember what we were discussing here. A 4.7uF cap that's getting charged through a resistor to some 5V, in order to generate a ti

The fact that these scopes worked for some 30 years without needing any "derating", then these caps suddenly started to popcorn, may suggest that their failure is related to an aging mechanism, not an

Which are all well within the 20% tolerance of the original part.... OTOH I never heard of anyone routinely replacing ceramic caps when "re-capping". ---In TekScopes@..., <tekscopes@yahoog

B.S. http://dilbert.com/strips/comic/2001-08-19/ ---In TekScopes@..., <tekscopes@...> wrote: Hi, Let echo Dave's comment. The industry has always made poor and mediocre manager

I'm usually on the buying side... I recently bought with no problems from Russia, Taiwan, Hong Kong and China. Russia surprised me with unusually fast shipping - 5 days to get here wow.... US takes lo

Here's a list with proper LS: 2.2nF/250V paper Y2 -> 2.2nF/250V Kemet PME271Y422MR30 2pcs 10nF/250V paper Y2 -> 10nF/250V Kemet PME271Y510MR30 1pcs 68nF/250V paper X2 -> 68nF/275V Kemet PME271M568MR30

saw that too. the "B" series are pretty much like facebook stock.... keeps going up for no apparent reason.... :-) ---In TekScopes@..., <tekscopes@...> wrote: I had a look arou

---In TekScopes@..., <tekscopes@...> wrote: >now I lost the 5V (J119 pin2), it's 0.76V. You defeated Intel by 0.04V. It took them decades to reach 0.8V and that only on selecte

Here's how it went in a 2467B: http://groups.yahoo.com/group/TekScopes/photos/album/1079293848/pic/1956921192/view

I used ceramics (pretty low ESR too) as replacements for the 1uF bipolars and all is well after a couple of months :-)

Why not use 5mm LS caps. Here are some suggestions: UPX1V101MPD - This would stay in line with what Tek has originally used. The Tek installed ones were PL series, later discontinued and replaced with

Use Mouser part number 647-UPX1V101MPD if you have any concerns about lead spacing.

The Green Nichicons were definitely PL series too. It was just Nichicon that changed the sleeve color around that time. The PL series was later discontinued and these days their designated successor i

Not necessarily, they might be installed by Tek, another gentleman here with very high serial nr. scope had brown Nichicons too instead of the usual green ones as seen here: http://groups.yahoo.com/gr