Re: Capacitor shelf life or expiry date?
I remember seeing some larger US-made caps with epoxy end seals (Sprague 676D and 677D? And Mallory's near-equivalent?). Nippon Chemicon's RZ and RZA series had epoxy end seals. But I only saw new parts of these types, not parts that had sat unused on a shelf for 10 years. I think that the fact that epoxy end seal parts are uncommon (some Vishay 678D parts are available with epoxy end seal) suggests that either it was ineffective or the cost-benefit ratio made it economically marginal.
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Re: Capacitor shelf life or expiry date?
The rule of thumb I've heard is to not store electrolytic capacitors for more than 5 years, but I'm not sure how true that isLeave a comment:
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Re: Capacitor shelf life or expiry date?
the electrolyte is sealed in with a rubber bung - it can harden and degrade too.
there have been attempts to improve this, but i dont know if they helped because i never see the capa i'm about to mention unused.
an american company in the 80's put epoxy over the end of the cap to cover the rubber seal,
the japanese made some with a plastic case and an epoxy seal instead of the rubber,
and the soviets used a plastic bung with a rubber washer and crimped the can over it.
what i can say is none of those ideas stop them aging inside stuff.
so now you know more than you wanted to know
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Re: Capacitor shelf life or expiry date?
good info there to read up on. didnt realize caps could degrade when not used.Leave a comment:
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Re: Capacitor shelf life or expiry date?
It may take years or decades, but as stj posted, electrolytics can dry out sitting on a shelf or in something electronic that is not powered on for those years.
Electrolytics that are not used for quite a few months (a year or two?) can also have the aluminum oxide dielectric thin, so that they can no longer withstand their full rated voltage. This thread discusses the process of re-forming the dielectric layer, https://www.badcaps.net/forum/showthread.php?t=50530 .
I apologize for being vague about timing, but electrolytic capacitors don't have a "Best If Used By" date.Leave a comment:
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Re: Capacitor shelf life or expiry date?
only electrolytics - because they have liquid sealed in themLeave a comment:
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Capacitor shelf life or expiry date?
do capacitors have a limited life even if just kept in a box in storage?
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Guys. could you help me please to decode some codes of main capacitor's producers.
I would like to know the manufacturing date.
Based on the information from capacitors I have - it seems easy to decode manufacturing date for Rubycon, Nichicon.
If I understood correctly:
1. Nichicons marks date of production as (see the attached pictures) H2116
I don't understand the meaning of first letter - may be it is code of factory.
21 -year
16 week
I bought this capacitor recently.
another one-
2.... -
Hi people, I hope this is the correct spot to post this, I'm new to the forum.
I have an RTX 3080 Founders Edition which has a burnt up capacitor (it was in parallel with another capacitor which appears damaged too), so I am hoping to be able to identify the capacitor values and order replacements.
I hope these photos make it clear which component I am referring to:
(yes, the soldering is a bit botched from removing the blown one, I know)
I have found the board schematic (attached), but there does not seem to be a boardview available. I have never... -
I replaced some capacitor which is located on optical pickup pcb which is shown in the table below(PCB #2).Because it have been out of order.
Now,It works very well,But I just have found that all caps (6svpc100my and other part number as well) ,which is shown in the table below, has ultra-high ripple current spec.
It is not able to obtain any capacitor which can be a substitute for this ultra-high ripple current nichicon capacitor.
So I replaced it with samxon and rubycon's general capacitor(GP,YXA series).
I know that these capacitor will not last as long as nichicon capacitor... -
I desoldered samwha NF capacitor(50v 5.6uf) from PCB circuit of 29inch CRT TV which have symptoms of no display after I heard sound of inrush of current to TV whenever I switch on this television.
I measured ESR value of this non-polarized capacitor(samwha NF capacitor 50v 5.6uf) by means of MESR-100 ESR meter and It displayed 0.3 ohm
And When I measured its capacitance with digital multimeter and LCR-T4 Mega328 meter, It displayed 10uf from DMM and 8uf from LCR-T4 meter.
I found catalogue of samwha capacitor(samwha-catalogue_3.pdf file), which is attached to this thread,... -
When I tried to repair LG 29 inch CRT TV, I found that the ESR value of samyoung SMS capacitor(160v 2.2uf), which is very close to D1879 transistor, is 6 ohm.
Judging from above ESR Meter Table,I think It is necessary to replace this sms capacitor.So I visited local electronics shop,and I purchased 160v 2.2uf rubycon YK capacitor.
But when I browse through rubycon YK datasheet,I found that there is no ripple current rating for 160v 2.2uf specification. But On the contrary, I found 39 mA ripple current rating for 160v 2.2uf SMS capacitor.
Rubycon YK DataSheet (b...
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