Hi all,
I have an ML350 G5 with two bad caps. One is ruptured, and the other is pushing out the bottom, I think, because the cap was tilted on the motherboard, and when I tried to straighten it, it felt like it kind of broke loose, like the electrolyte had stuck between the board and the cap (not the cap leads, just the electrolyte dried between the cap and the PCB).
Anyway, the caps in question are:
It seems like these caps are discontinued, so I'm looking for replacements. I've done a bit of research, and from what I've read, I should get caps with identical voltage and capacitance. For ripple and ESR, I should get equal or higher ripple, and equal or lesser ESR.
I found one site listing the MCZ caps, saying that since they were discontinued, it suggested the following replacements:
However, upon looking through the Nichicon catalog, I found the HZ series, which has:
On the 1000 uF cap, should I go with the Nichicon HZ or HN? For the general rule of getting a greater ripple rating and lesser ESR, are there limits to this rule? In other words, if I took that idea to the extreme, could it cause problems?
Also, on the 470uF cap, is the Nichicon replacement, with 1300 mA ripple (vs original of 1340) going to be close enough?
At this point, I am inclined to get:
Or should I go with both from the HN series?
Also, is there a difference between impedence and ESR?
Am I on the right track here, or would you all recommend something else?
This is going back into production, and can't really afford a mistake on this.
Thanks,
Monty
I have an ML350 G5 with two bad caps. One is ruptured, and the other is pushing out the bottom, I think, because the cap was tilted on the motherboard, and when I tried to straighten it, it felt like it kind of broke loose, like the electrolyte had stuck between the board and the cap (not the cap leads, just the electrolyte dried between the cap and the PCB).
Anyway, the caps in question are:
- Rubycon MCZ 16v 1000uF 8mm D x 20 mm H, 2350 mA ripple, 12 mOhm ESR
- Rubycon MCZ 16v 470uF 8mm D x 11.5 mmH, 1340 mA ripple, 21 mOhm ESR
It seems like these caps are discontinued, so I'm looking for replacements. I've done a bit of research, and from what I've read, I should get caps with identical voltage and capacitance. For ripple and ESR, I should get equal or higher ripple, and equal or lesser ESR.
I found one site listing the MCZ caps, saying that since they were discontinued, it suggested the following replacements:
- Nichicon HN Series 16v 1000uF 8mmD x 20mmH, 2220 mA ripple, 12 mOhm ESR
- Nichicon HN Series 16v 470uF 8mmD x 11.5mmH, 1300 mA ripple, 21 mOhm ESR
However, upon looking through the Nichicon catalog, I found the HZ series, which has:
- Nichicon HZ 16v 1000uF 8mm x 20mm, 2880 mA ripple, 9 mOhm ESR
- Nichicon HZ 16v 470uF is 10mmD x 12.5 mmH - better specs, but physically too big
On the 1000 uF cap, should I go with the Nichicon HZ or HN? For the general rule of getting a greater ripple rating and lesser ESR, are there limits to this rule? In other words, if I took that idea to the extreme, could it cause problems?
Also, on the 470uF cap, is the Nichicon replacement, with 1300 mA ripple (vs original of 1340) going to be close enough?
At this point, I am inclined to get:
- Nichicon HZ 16v 1000uF 8mm x 20 mm, 2880 mA ripple, 9 mOhm ESR
- Nichicon HN 16v 470uF 8mm x 11.5 mm, 1300 mA ripple, 21 mOhm ESR
Or should I go with both from the HN series?
Also, is there a difference between impedence and ESR?
Am I on the right track here, or would you all recommend something else?
This is going back into production, and can't really afford a mistake on this.
Thanks,
Monty
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