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Old 04-29-2010, 03:30 PM   #1
ethaniel
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Default What can you tell me about Epcos caps?

I'm just tired of finding generic caps where I live, but I've found a place that sells Epcos caps. They are like Siemens, right? Good, bad? Have someone used them on a motherboard? Any other specifics? Thanks in advance.
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Old 04-29-2010, 06:04 PM   #2
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Default Re: What can you tell me about Epcos caps?

EPCOS was acquired by and is a subsidiary of TDK.
I'm not aware of them offering any low ESR motherboard grade caps.
Lacking any history I wouldn't use their electrolytics.
If they make solid polymer caps then those might be worth a try.
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Old 04-30-2010, 12:13 AM   #3
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Default Re: What can you tell me about Epcos caps?

uhm.. i found Siemens/EPCOS caps on a lot of older (early 00's) Fujitsu-Siemens made Mainboards. (for example the D1184)

all of them had jamicon-like vents and most had the cheapo circular rubber bungs, but some had a Sanyo-like bung..


they were still OK when i pulled them (no instabilities at least) from my own D1184 but you never know..

all of them (EPCOS or Siemens) were called "LL" as the series (?)..

apart from the changing rubber bungs, all of them looked exactly the same.. (same vent, same label)



^- those came out of my FSC D1184 i recapped 2 days ago and were used in the CPU VRM area.
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Old 04-30-2010, 01:31 AM   #4
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Default Re: What can you tell me about Epcos caps?

That's old caps.
I don't think he's buying old used caps.
Presently EPCOS was acquired by and is a subsidiary of TDK.
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Old 04-30-2010, 06:48 AM   #5
ethaniel
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Default Re: What can you tell me about Epcos caps?

Thanks a lot for the info. As PCBONEZ said, Epcos caps don't seem to have a "good" ESR. I have found the datasheet for those B41856 on the pics, and have a "ESRmax" of 0.24. I believe Rubycon MCZ have something like 0.016, right? Quite a difference. I'll just keep looking. There must be quality caps somewhere down here...
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Old 04-30-2010, 10:33 PM   #6
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Default Re: What can you tell me about Epcos caps?

just replaced some epcos in a rca lcd tv.
08 datecode and blown up like the all too common fz.
customer heard these let go.
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Old 05-03-2010, 04:27 PM   #7
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Default Re: What can you tell me about Epcos caps?

Good news: I have found a place that can get Panasonic FM, FC, FK, NHG and Nichicon PS from the UK via import. The price is... well, considerable, but this is the good stuff. I don't have anything to cap right now, so I'll have to wait until something blows up.
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Old 09-28-2012, 03:21 AM   #8
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Default Re: What can you tell me about Epcos caps?

Sorry about resurrection, but found these inside my TV: Chang and the unfamous Epcos. Should I change EPCOS ones too or only the Changs?
Attached Images
File Type: jpg img9820o.jpg (170.0 KB, 76 views)
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File Type: jpg img9819w.jpg (216.1 KB, 64 views)
File Type: jpg img9823f.jpg (90.3 KB, 50 views)
File Type: jpg img9824n.jpg (291.2 KB, 50 views)

Last edited by OniJon; 09-28-2012 at 03:24 AM..
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Old 02-26-2013, 05:27 PM   #9
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Default Re: What can you tell me about Epcos caps?

Quote:
Originally Posted by ethaniel View Post
Thanks a lot for the info. As PCBONEZ said, Epcos caps don't seem to have a "good" ESR. I have found the datasheet for those B41856 on the pics, and have a "ESRmax" of 0.24. I believe Rubycon MCZ have something like 0.016, right? Quite a difference. I'll just keep looking. There must be quality caps somewhere down here...
I just ordered 5 samples from Epcos and the accompanying test paperwork states that the actual caps I received reported an ESR @120Hz of only 0.041. Not great but not anywhere close to 0.24. Please don't flame me too badly, since I'm somewhat of a noob when it comes to cap frequencies. Until now, I typically have only bothered looking at capacitance and voltage for the electrolytic variety. What specifically makes a good MB cap, is ESR the main consideration? Is a measurement at 120hz relevant for MBs? Seems fairly low for this purpose.

Thanks,
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Old 02-26-2013, 05:33 PM   #10
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Default Re: What can you tell me about Epcos caps?

The VRM powering the cpu and other dc-dc regulators on motherboards work at high frequencies, often above 50-70kHz.

ESR will be a totally different value than the value measured at 120Hz, so will the capacitance (usually capacitors not designed to be low esr will decrease in capacitance a lot)
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Old 06-29-2020, 07:11 AM   #11
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Default Re: What can you tell me about Epcos caps?

I know it's an old thread, but these are Epcos LL, on a Fujitsu Siemens D1215 motherboard (Socket 370).

Specs:
820 uF, 16V, 105 degrees.

The capacitance was way off on all of them, ranging from ~600 to over 2000uF (one of the leaky ones).

https://www.digchip.com/datasheets/p...B41859-pdf.php

According to the datasheet, they are "very low ESR".
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Old 06-29-2020, 06:56 PM   #12
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Default Re: What can you tell me about Epcos caps?

Two different vent styles?
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Old 06-29-2020, 09:30 PM   #13
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Default Re: What can you tell me about Epcos caps?

wtf!
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Old 07-06-2020, 12:40 PM   #14
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Default Re: What can you tell me about Epcos caps?

That's strange. I didn't notice it when taking the picture. Only the ones with an >-< pattern have leaked.

Could they be fake?

All the markings are the same, and the smaller caps have different vents as well. The board had no signs of previous repairs.
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