# Capacitor help

#### d2freak82

##### New Member
I'm trying to find a specific capacitor, I'm having a rough time. I figured with the numbers on it I could find an exact replacement, but the only place I've found that is Alibaba and you have to order 1000, I only want 10 or so.
If there is another that would work in it's place, please advise.

From what I've been able to learn, or what I think I've learned and found out is that it is 25uf mkp x2 (safety capacitor) + - 10% but those numbers could be wrong. Could someone help me find this capacitor or a suitable replacement?

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#### tvtech

##### Well-Known Member
That cap is old and huge. What is it from?

OK. 305VAC rated. X2 cap. Looks like 22NF. Big for that capacity.

#### d2freak82

##### New Member
it is for an electrical filter, paired with 100k resistor

#### tvtech

##### Well-Known Member
Well, if I'm correct that it is indeed a 22NF cap....X2rated... they are readily available. 25 is not a standard cap value be it in any capacity..NF or PF or anything else.

Your application with the 100K Resistor is making me scratch my head...

#### tvtech

##### Well-Known Member
X2 rated caps are there for noise suppression on SMPS. You have something noisy. But it's a secret lol.

#### tvtech

##### Well-Known Member
Explain exactly what the unit does..it's application... everything. Than we can figure stuff out. Otherwise it's just guesswork for us.

#### tvtech

##### Well-Known Member
Oh and another thing lol....we are a bunch of seasoned pro's in our chosen fields. We don't guess...we deliver answers. We are not 'try this try that".
We know our stuff.

But you must help too by giving us the most info you can with the problem you are battling with.

TV

#### tvtech

##### Well-Known Member
And he's gone offline.

No worries. ETO still the place for accurate Info. Noone here tries to impress anyone else. Members here know their stuff. That's what counts.

I don't try to pretend I know Microprocessors and Digital and stuff . I don't.

Here we go with what we know.

ETO is the place to go for accurate, advice.... not Clueless guessers.

Long live ETO. Best, most technically savvy site on the WWW.

#### Tony Stewart

##### Well-Known Member
X-rated Caps used for microwave ovens etc (6.8uF is common) are about $1/uF @600Vac these are readily avail. From Mouser, DK etc. Then you can put pin parallel or choose the most economical buy. Lower VOltage ones are about 0.2$/uF and rises with voltage

#### d2freak82

##### New Member
to filter out line noise from electrical outlets. AC

#### Nigel Goodwin

##### Super Moderator
to filter out line noise from electrical outlets. AC
Why do you imagine you need one?, and why would you think that huge capacitor would help?.

#### Tony Stewart

##### Well-Known Member
Sorry 256K means 250 uF the others were wrong too. Not nF

I expect this to cost ~ $100 or$.4/uF @ > 310Vac rated . If the application is AC dont choose a DC rated CAP

. THese are X2 (verify) rated grid caps. But these are elephants when they only use 1nF ~10nF X&Y caps to earth groundwith a series CM Choke inductor to make are CM line filters which is the ideal EMI noise filter that is bi-directional. X means lin to neutral and Y means to earth ground which attenuates differential noise with a CM choke and bypasses the RF noise to earth Gnd. And also attenuates line transients from switching grid voltage and weak lightning transients. A series Polyfuse then adds extra immunity to protect the caps from absorbing too much energy from over-voltage lines

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#### d2freak82

##### New Member
Why do you imagine you need one?, and why would you think that huge capacitor would help?.
to filter dirty electricity

#### tvtech

##### Well-Known Member
But where does the 100K resistor fit in ?

#### Nigel Goodwin

##### Super Moderator
to filter dirty electricity
Why is your electricity 'dirty'?, and what difference do you expect it to make?.

Huh ?

#### d2freak82

##### New Member
1 more question, is there a suitable replacement for the Panasonic 20uf JS181206-AA
same application

Dirty electricity is erratic spikes and surges of electrical energy traveling along power lines and building wiring where only standard 50/60-Hertz AC electricity should be. Also called electrical noise, line noise, and power line EMI.

#### tvtech

##### Well-Known Member
Dirty Electricity.

We've lots here. X2 caps don't help.

#### d2freak82

##### New Member
I've seen it lower it, but if not... do you have another suggestion?