Where to buy capacitor

[ccmg]

I need a capacitor for my Radeon 9800 Pro. I believe from the markings on the top, it is a 18uf 16v capacitor. Does anyone know where I can buy this model capacitor?

A2DS
180
16v


Similar capacitor

 

[imported_rod]

Why do you need a capacitor? Did you fry one or something?

Most electronics stores have them. If you live in Australia, I can tell you exactly where you can get them.

18uF is it's capacitoy
16V is it's maximum voltage

Most electronics stores hould stock them, though you'll need to find out wether it's a ceramic, polyester, tantalum or electrolytic type. My guess would be one of the latter two...

Hope that's helped.
RoD

 

[lenjack]

Why not take the bad cap to RadioShack and have them match it up? These things are very cheap.

 

[grohl]

Fry's .... if you are lucky enough like me to live by one.

 

[ccmg]

Originally posted by: rod
Why do you need a capacitor? Did you fry one or something?

Most electronics stores have them. If you live in Australia, I can tell you exactly where you can get them.

18uF is it's capacitoy
16V is it's maximum voltage

Most electronics stores hould stock them, though you'll need to find out wether it's a ceramic, polyester, tantalum or electrolytic type. My guess would be one of the latter two...

Hope that's helped.
RoD

I've called several places about this capacitor and the closest model they have is a 22uf capacitance 16v cap. Will this work or do I have to have an exact match?

 

[Zepper]

Caps used in computers are generally very low ESR types for fast response times and high ripple tolerance to deal with the power from switching PSUs. Unlikely to find them at RS. I don't know of any place that may stock that that welcomes small orders. You could try some odd-lot places like allelectronics.com or bgmicro.com - but they are unlikely to list the ESR rating or ripple tolerance of the cap in their descrips. Most places that sell such things for sure (like digikey.com or mouser.com) require a minimum order and/or charge a small order fee. Try jameco.com too.

. BTW, there is no voltage in PCs higher than 12V so look for 15V rating too as that is a more common rating than 16V as long as you have a bit of a margin above the nominal (+12V).

Oh, you didn't mention it was a surface mount type - the normal volt rating on those IS 16V.

.bh.

 

[DanDaMan315]

OP is most likely trying to overvolt his 9800 with the capacitor trick, I thought about doing this to my card, but the overclocking potential wasn't worth the potential elimination of the card.

 

[Zepper]

Is what DanDaMan said true? If so, then what's the matter wit ya? Got a screamingly fast (and expensive) vid card already yet will risk it for a few extra FPS... Must have paid for it with OPM!

.bh.

 

[Mark R]

It's probably a power smoothing capacitor, in which case you may be able to get away with only an approximate match.

However, there is a potential problem in that ideally the capacitor should be computer power supply grade (very low ESR, high ripple current. See Zepper's post above).

Higher voltage capacitors generally have better performance than lower voltage ones (but are bigger), and if you get one with a slightly higher capacitance it'll probably be OK.

The other problem is the packaging - the capacitor that broke off is 'surface mount' - it has tiny little metal legs that are soldered onto the surface of the PCB. Most caps you could buy from RS are 'through hole mount' - they've got big long wires which are supposed to be soldered into holes in the PCB. This actually isn't a disaster, as the caps are fundamentally the same apart from the packaging - if you get an through hole one, you'll just need to be creative in how you attach the cap and its wires to the PCB.

A 22 uf - 33 uf capacitor with 16-25V rating will probably do, but may not perform as well as the original. Don't forget that when you get the replacement that you connect it the right way round - put it on backwards and it will explode.

 

[ccmg]

Nope, I actually have never OC'd anything and I don't intend on taking the risk. A cap broke off the 9800 and I'm just looking for a replacement. If the location of the cap makes any difference, it is right infront of the molex power connector on the back of the card. One other question, will a suface mount cap give me enough room to solder with?

 

[Zepper]

You will need a fine point soldering iron and fairly low wattage - like the grounded tip one from RS. As there is no way to get heatsinks on the cap leads, you will have to be fast and accurate so as not to overheat the cap. Probably need a magnifying lamp to improve the view. Need to smooth the pads on the card with the soldering iron before trying to attach the new cap so it will sit properly. And as was mentioned, reverse polarity - kaboom (adtually more of a sharp snapping sound).

Here is a Panasonic part no. for what you need: EEV-FK1C220R - has an impedence of 0.7 Ohm and a ripple current tolerance of 160mA rms. There may be an even better part available now as this was from the early 2004 digikey catalog. They had a polymer aluminum cap back then that has extremely low ESR (measured in milliOhms) and very high ripple current, but they didn't have one as small as 22uF at 16V then (at least in the catalog).

.bh.