Elna capacitors - fake?

[Olkus]

Hi,

I have capacitors like this one in the photo. There are differences between other Elna series, I attach foto of Elna RE3. On this green capacitors series is not specified! Fake?

[stj]

Re: Elna capacitors - fake?

it's old - atleast if the datecode is real.
why does the vent have dirt in it?
is the top even flat?

[Olkus]

Re: Elna capacitors - fake?

The top is OK, no dirt in the vent. Parameters are good, capacitance (all 100 pcs) is 47uF>, ESR about 1R.

[stj]

Re: Elna capacitors - fake?

1ohm sounds high

[Olkus]

Re: Elna capacitors - fake?

1ohm sounds high

I think it's not bad for 47uF 16V, not Low ESR. I've compared with other parts with the same parameters, and the results are similar.

[stj]

Re: Elna capacitors - fake?

you say it's not low esr, but it is 105' temp rated.

[Olkus]

Re: Elna capacitors - fake?

1ohm is too much for this caps? I don't have datasheet so is not possible to check.

[stj]

Re: Elna capacitors - fake?

i looked at a bunch of random datasheets for 105' but average esr caps
rubycon YXF for example is 0.9ohm

[momaka]

Re: Elna capacitors - fake?

I think it's not bad for 47uF 16V, not Low ESR. I've compared with other parts with the same parameters, and the results are similar.

+1
For small caps in 5x11 size, 1 Ohm at room temperature is not abnormal at all... even for low ESR series. For GP (non-low-impedance) caps, even up to 2-3 Ohms may be OK, depending on room temperature and age of the cap. In any case, 2-3 Ohms still not considered out of spec.

BTW, the light-green Elna might be a low-leakage type cap. A lot of older light-colored sleeve caps were typically low leakage type meant for audio circuits / signal coupling.

[Olkus]

Re: Elna capacitors - fake?

Thanks for your answears.

BTW, the light-green Elna might be a low-leakage type cap. A lot of older light-colored sleeve caps were typically low leakage type meant for audio circuits / signal coupling.

Probably you are right. This caps are bigger than my other caps with the same parameters. And I compared with many photos on internet, and I think they ae not fake. But I'm still not one hundred percent sure.