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High Grade Capacitors for CPU VRM Circuitry

PrinceXizor

PrinceXizor

Platinum Member
I have a Powerleap PL-Pro/MMX Plus! and one of the caps came off. I went to solder it back on and noticed it looks like the cap has "blown up" on the bottom and needs replaced.

2200uF
6.3V
105C

However, I know that on CPU power circuitry, your ripple current tolerance should be extremely high and your ESR should be extremely low. They also should maintain well at high temperatures. Anyone have any suggested part numbers of caps that are used in current CPU VRM circuitry that will fit the bill?

Thanks!

P-X
 
Are you sure there are no other markings?

Anyway - this one from www.mouser.com looks OK electrically: 647-UHD0J222MPR

It's got a respectable ripple current and ESR (there are better but not easily available), and it's probably going to get close to the performance of the one it replaces.

As to whether it will fit, well you didn't tell us what size the caps are - this one is 10mm diameter and 25mm long.
 
I can find many that are electrically equivalent to the specs given...its the ESR and ESL I'm concerned about. It's pretty much in a standard radial lead package for an aluminum electrolytic capacitor.

It's roughly 22mm x 10mm, the 10mm diameter is the critical dimension.

If someone has a p/n (and therefore complete electrical/physical properties) from current motherboard VRM capacitors, that would work too.

P-X
 
Well, this one has the lowest ESR and highest ripple current that I could find. It's an Nichicon 'HD' series cap which is marketed as 'ultra low impedence'.


If you are interested then the CPU VRM capacitors on by NF7 are Rubycon 6.3MBZ3300M - these are 3300uF caps, and are Rubycon's latest ultra-low ESR offering. They are 10mm diameter, so would likely be a satisfactory replacement.
 
Yeah, I'll get a 2200uF one...though I'm 99% certain the increase in capacitance is to handle even more ripple than my 2200uF cap. Thanks for the find. I'm sure if these are used on current mobo tech, then the ESR and ESL are in good shape.

P-X
 
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