Replacing oddball electrolytic - 1650uF

[dumpystig]

I have a 10 year old desktop PSU that I'm adapting to use as a bench PSU. There is one particular electrolytic I need to replace but I'm having trouble finding an equivalent of this specific value.
The existing cap is a Fuhjyyu, TNR Series, 1650uF, 16v, 105C. Dimensions are 10D x 23H mm.

I'm in the UK, any pointers to a supplier would be a great help.

[yyonline]

Re: Replacing oddball electrolytic - 1650uF

I think that TNR is a general purpose series capacitor. 1650uF is an oddball value, so it's probably best to change that slightly to either 1500uF or 1800uF. With 1800uF, it's hard to find anything in 10mm size. Going down to 1500uF I found:

http://uk.farnell.com/panasonic/eeuf...0uf/dp/1744920

http://uk.farnell.com/panasonic/eeuf...0uf/dp/1855164

Those are both "entry level" low-ESR caps and should exceed the specifications of the original, but not so drastically as to throw anything off.

[PCBONEZ]

Re: Replacing oddball electrolytic - 1650uF

It's a Fuhjyyu TN. The R is some marketing thing.
The Ripple is less than 1000 mA and it's not low ESR, but it should have been.
[Seems PSU manufacturers don't know the difference between Fuhjyyu TN and TM and it's a big difference.]

I disagree with going down in uF.
In a PSU the uF in the OP filter caps helps with transients [load changes] which is rather important in a PSU.
It would probably have been a 2200uF or more in a quality PSU.

Go up to 1800uF or 2200uF in a good brand.

The tough part will be finding 1800uF or 2200uF 16v in and 10mm.
Many series don't have an 1800uF 16v at all and of those that do many are 12.5mm.
[So if a 12.5mm will fit you have more options.]

For a 10mm from Farnell this would be my choice.
http://uk.farnell.com/panasonic/eeuf...0uf/dp/1744922

In the UK you have RS Components and Farnell.
Member Big Pope sells Samxon out of Hong Kong.
Badcaps.net ships to most places in the UK.
.

[yyonline]

Re: Replacing oddball electrolytic - 1650uF

I agree with PCBONEZ on this one. Going up in capacitance is preferable. I didn't realize 16V 2200uF capacitors existed in 10mm (aside from custom sizes), so I didn't bother looking.

[dumpystig]

Re: Replacing oddball electrolytic - 1650uF

Cheers lads. I had already logged the caps you've listed, but I first wanted to know if the original value was available somewhere. It is an oddball, so I guess I will settle for 2200uF - the diameter is critical as it sits in the middle of a bunch of surrounding components.
When replacing caps I also never go below original value, either voltage or capacitance, and I always prefer to use 105C.
I have an account with CPC (a division of Farnell) so will order it together with a few others I need.

Thanks again for your input

[dumpystig]

Re: Replacing oddball electrolytic - 1650uF

The 1650uF cap is connected across -VE and +12V (yellow) output. Anyone envisage any probs with upgrading to a 2200uF?

[c_hegge]

Re: Replacing oddball electrolytic - 1650uF

Assuming it's an output filter cap, then no, there shouldn't be any issues.

[mockingbird]

Re: Replacing oddball electrolytic - 1650uF

I'm recapping a Hipro.

There are two 16V 2200uF Teapo "SC" caps. Is it ok to put Samxon RS 16V 3300uF in their stead?

[dumpystig]

Re: Replacing oddball electrolytic - 1650uF

Assuming it's an output filter cap, then no, there shouldn't be any issues.

Yep, that's exactly what it is.

[PCBONEZ]

Re: Replacing oddball electrolytic - 1650uF

I'm recapping a Hipro.

There are two 16V 2200uF Teapo "SC" caps. Is it ok to put Samxon RS 16V 3300uF in their stead?

SC 2200uF 16v
10x30 1780 0.032
13x20 1720 0.033
13x25 2000 0.028

RS [INCL 3300uF 16v]
10x30 1675 0.040

FK [INCL 2200uF 16v]
10X30 2140 0.025
.

[mockingbird]

Re: Replacing oddball electrolytic - 1650uF

But capsmod lists my 16V 3300uF RS as this:
Samxon RS 3300 uF 16 V 10 mm 30 mm 0.035 Ω 3000 mA 105 °C 7000 h 100 20 Long Life Assurance, Low Impedance

Is he mistaken?

Yea, I considered the FK. Most of the caps (Teapo SC and Ltec LZP) are around mid 30ish to 40ish ESR. Is the lower ESR of the FK ok?

[PCBONEZ]

Re: Replacing oddball electrolytic - 1650uF

I read the RS data sheet.
The 2700uF 6.3v and 1500uF 16v in 10x30 both show what I said.

I'm not 'buying' those numbers.
A 12.5x30mm RS is 0.034 2240
A 12.5x40mm RS is 0.025 2798
.
An RS series cap would have to be like 10x50mm or longer to get those numbers.
.

[mockingbird]

Re: Replacing oddball electrolytic - 1650uF

Yes, after you posted the RS specs, I did a doubletake.... I remembered what you said that diameter is really the most important factor in determining specs usually...

There's no way to test this I imagine... I'll see if I can get FKs somewhere other than Newark... I'm loathe to pay their ridiculous shipping.

[PCBONEZ]

Re: Replacing oddball electrolytic - 1650uF

Not the diameter but the overall can size.
It's a case where bigger is better.
.

[mockingbird]

Re: Replacing oddball electrolytic - 1650uF

PCBONEZ -

I have an FSP 350-PN here. It's got a 10V 4700uF Teapo SC 10x30 here...

Since the closest thing is still the 2200uF FK, can I use it to replace it?

I'm now also concerned about the 10V 3300uF SC in this PSU... They're also 10x30... Does this mean Samxon RS is NOT a good replacement for equivalent diameter Teapo SC?

[PCBONEZ]

Re: Replacing oddball electrolytic - 1650uF

It's the 16v 10mm that is tough.

Look for a 3300uF in 10mm [6.3v or 10v.] with appropriate ESR.
- Lots of series have one.

Or if you can fit a 12.5mm go that way with higher uF.

I did some FSP-460[something with a P] a while back and IIRC I used a 12.5mm 4700uF PW for something or other in there.
I'll look for sure later. [Is nappy time.]
.

[PCBONEZ]

Re: Replacing oddball electrolytic - 1650uF

It was an FSP-460PN
Used a 4700uF 6.3v 12.5mm PW
Old cap was a 13mm Fuhjyyu.
.
Sorry for the delay, I forgot what the topic title was.
.
I did 5 or 6 of those a few years ago.
Mixed caps, mostly Teapo. [Each had a different assortment of caps.]
3-cap PI filters on all the rails with big fat caps.
Only about 1 in 20 Teapos were bad.
All the OST and all the Fuhjyyuu were bad.
.

[mockingbird]

Re: Replacing oddball electrolytic - 1650uF

Thank you for checking.. I observe the Sabbath so I only saw your post tonight anyway.

I checked the PSU, it's really tight, I don't think I can fit a 12.5mm cap in there. What do you suggest?

[PCBONEZ]

Re: Replacing oddball electrolytic - 1650uF

This is all I can find in stock anywhere.
.
http://www.mouser.com/ProductDetail/...vS7WEP0lgok%3d
.
That's a big step in ESR but I'd rather lower than go to 2200uF when the old one was 4700uF.
If it's in a PI filter lower the ESR of the caps on the other side of that coil and it shouldn't unbalance anything enough to notice.
The 'new' ripple is 2550 [big step too, up from 1780] so current shouldn't be a problem.
.

[dumpystig]

Re: Replacing oddball electrolytic - 1650uF

Replaced the 1650uF with a 2200uF. I could only get a 12.5mm dia. but managed to shoehorn it in amongst the surrounding components. PSU is now running fine.

Thanks for the advice