Caps above 25 V?

[Behemot]

OK, at this moment I got most of the caps I need for my own use (ATX PSUs, displays, UPS, some mtherboards). So I'd like to stock some more, but after my previous experiences, I don't want to end with something I will be selling a piece per month.

What are the most common other caps starting from say 25 V ppl use? Got some tips? Capacities, or mabye more like maximum dimensions and voltage would be good, than I'll see what I can get in those.

[WeaselXP]

Re: Caps above 25 V?

Having trouble finding 390uf 400v snap in caps with D25 and H42-H45, however, I don't need many.

[Behemot]

Re: Caps above 25 V?

There are KMR, KMW, KMZ (2000 hour) or LXS (5000 hour) available, maybe I can get a few as one-time sample…how many would you like? But in future only full box of the same kind. I have the feeling MOQ for these big ones is not that tragic, 200 pcs. In such case I'd still like ppl to pre-order at least 50 before I'd order such thing, it will still be many hundred dollars which would otherwise lay on shelf for only a few pcs I would sell immediatelly.

Anything in the range of 35-63 V you use often?

[ReeceyBurger123]

Re: Caps above 25 V?

Most common 25v ones for me I mainly use Low esr type for power supplies and inverters:

1000uf 25v 10mm Di
220uf 25v 8mm Di
2200uf 25v 12.5mm Di
100uf 25v 6.3mm Di
470uf 25v 10mm and 8mm Di
680uf 25v 10mm Di

[Behemot]

Re: Caps above 25 V?

Got most of those, the only ones I do not have are 470/25 and 2200/25. Got 680/35 D10.

I replace most of the 25V with 16V caps in displays. and so on with 16 and 10V original caps, just rarely there is 24 V which is still good to replace with 35V caps. But things like 14 V rail, 1500/16 are just OK for that. You got much higher capacity and quality caps have no problem with that, just crapxons which rated 16 V can actually be anything between 14 and 16 V capacitors.

I know there are high capacities like 2200/25 or 1000/35 often used in bigger displays and especially TVs, but I only rarely repair those. If some ppl here with reasonable demand for those use them, I can definitelly stock some…e. g. KYB 2200/25 D12.5x25 and 1500/35 same size, 10000 hours @105 °C.

[WeaselXP]

Re: Caps above 25 V?

Do you know the ripple current rating on those? I only one I found here was a Nichicon that was rated at 1.23 which seems low. The ones that were out of stock were 1.6 - 2.0. I like those better. I would only buy about 4. Also, some of them are expecting to restock in a month, so if it's too much trouble, don't worry with it.

[Behemot]

Re: Caps above 25 V?

KMR is 1.55 A, KMW 1.67 A, KMZ 1.64 A (those are actually 420V, not just 400V) and LXS 1.63 A.

Generally there is combination of few parameters while at least one is always missing. So it will be very difficult to find a capacitor which is small, has long life time, high ripple current, 105°C rated and also has high capacity. Almost always one parameter is worse…

[WeaselXP]

Re: Caps above 25 V?

They all sound acceptable. If the LXS or KMZ are available, let me know.

[mockingbird]

Re: Caps above 25 V?

How about stocking some high-endurance small caps?

I'm always getting stuck with FC or PW 5mm caps when I'd prefer something like HE or KY. You know the usual values:

0.1uF
1uF
2.2uF
4.7uF
10uF
22uF
47uF (You already have this)

Maybe also some high-endurance miniaturized caps, all the above values in 4mm. Always use them for modular boards in FSP PSUs.

[Behemot]

Re: Caps above 25 V?

I don't think there are really any low-ESR 1uF caps from NCC but I got all the rest. Check again

WeaselXP: I'll ask for them and let you know. Maybe colleague of mine can take them to US next time.

[mockingbird]

Re: Caps above 25 V?

I don't think there are really any low-ESR 1uF caps from NCC but I got all the rest. Check again

WeaselXP: I'll ask for them and let you know. Maybe colleague of mine can take them to US next time.

No, not low ESR small value caps, but high-endurance small value caps.

What you got is general-purpose VZ series... 1000 hours only.

[Behemot]

Re: Caps above 25 V?

There is nothing besides maybe some old and obscure series with high endurance which is not also low-ESR. You just won't make GP cap handle 5000 hours.

KY with 4000 hours not good enough? I am slowly replacing them with KYA, they are cheaper, otherwise same for these small values.
KY 2,2 50 D5x11,5
KY 4,7 50 D5x11,5
KYA 10 50 D5x11
KY 22 50 D5x11

[mockingbird]

Re: Caps above 25 V?

Yes, KY class are high endurance for 5mm (but KYA and KYB are also 4000 hour for 5mm).

But it's not the case that there are no high endurance GP caps. Panasonic EB is a good example (5000 hour for 5mm).

More high-endurance GP-class caps are Nichicon MV, SV, TS, TT and PV (PV is PW with an epoxy bunge AFAIK).

And your stock of KY is pretty low. Are there any inexpensive small caps with high endurance?

[japlytic]

Re: Caps above 25 V?

Chemi-Con KZN Series (my preferred low-ESR series and recommended for new applications at the time of posting) have a life of 6000-10000 hours under worst possible conditions (maximum temperature, voltage, and ripple current applied) and come in voltages from 6.3V to 100V.

[Behemot]

Re: Caps above 25 V?

The EB series is interesting, it seems to me like older series for high voltage, just that they also made them for smaller voltages. Seems that few of them will be EoL'd by the end of march and more may follow soon…

[Behemot]

Re: Caps above 25 V?

I found some long-life automotive series from NCC, LE, that one has life of 10000 hours for D5 caps. It may have somewhat higher ESR, but judging from the ripple current, the difference compared to low-ESR will be small. So I would still not count them as GP…

[mockingbird]

Re: Caps above 25 V?

I found some long-life automotive series from NCC, LE, that one has life of 10000 hours for D5 caps. It may have somewhat higher ESR, but judging from the ripple current, the difference compared to low-ESR will be small. So I would still not count them as GP…

LE is very nice...

Only stock of anything I could find is this:

http://www.digikey.com/product-detai...766-ND/4726035

But something like Rubycon YXM should cost a lot less and is also rated at 10,000 hours. YXF and YXJ are also pretty decent @ 5000 hours. Digikey is taking something like 10 cents a piece for 5mm YXM in quantities of 50.

For high-endurance 0.1uF caps, I have a source for some NOS parts in large quantities.

[Behemot]

Re: Caps above 25 V?

Rubycon is, well…in future maybe. There are some brand new things I'd like from them, but…the distributor wants some damned papers, than money in advance etc. It'll take time to get through the process. Though it's true that at least some of those YXx are on the higher side of what's considered as low-ESR.

[Behemot]

Re: Caps above 25 V?

I got this ESR/impedance value curve (check attachment), these are measured values for LE 3.3/50. To compare with KY 3.3/50, the LE has about 15 % higher ESR and slightly lower RC.

They said something about comparing typical and calculated worst-case value - which I do not understand, besides this curve I got no other values. (there is nothing in DS regarding ESR/impedance, what's why I asked for it) If they mean like generaly the actual value is much better than the catalogue'd, in that case the real ESR difference is even larger compared to KY. But it's still not "general purpose".

Anybody interested? I've been told that generaly, the price is about 50 % higher than for KY. That means my estimated price for LE would be that of KY from those big-ass sellers. With twice the lifetime.

[mockingbird]

Re: Caps above 25 V?

Not worth it if you ask me...

Here's my logic:
Higher ESR means higher temperature. So take that 10,000 hour rating and compare it to KY (4,000 hour IIRC), but then compensate for the lower temperature. Definitely not worth 50% more considering YXM is equivalent in price to KY but also has a 10,000 hour rating.

So my guess is that LE has an expensive but unecessary for our purposes stabilizer in the electrolyte... Since it's an automotive series, the stabilizer is probably formulated to hold up better in the long run throughout repeated extreme environmental shifts due to the climate.