Understanding datasheets without impedance listed.

[Gabriel]

Ok, so I have a Ost RLG 10uF 50V I need to replace.
In the datasheet it is listed as 45mA and no impedance is shown except this listing I attached.

Does that mean it has an impedance of 2.0 and a proper replacement can be a Nippon CC LXY 103mA with an impedance of 1.9 ?

I put the RLG datasheet for you here if you need to see the datasheet.

Also I have a KSC GL 2200uF 10V 10x20 that has popped - the closest cap in their datasheet is 13x25.
Is it right to say that the ripple of the 13x25 is 1710mA with an impedance of 0.045 or am I totally lost ?

I also see that it is listed up to 200KHz, should I be worried by that when I look for a substitute as they normally are listed up to 100KHz ?

I put the KSC datasheet here for you.

Any help will do, Thanks.

[mockingbird]

Re: Understanding datasheets without impedance listed.

I find that the general purpose caps don't have the impedance listed but they do have something called "tan" instead. I've asked before what it means, but no one knew it seemed.

What I was told was to just match the ripple on GP caps, make sure it is equal or greater and don't worry about the impedance.

[japlytic]

Re: Understanding datasheets without impedance listed.

If the datasheet does not mention 'high frequency' use (e.g. lighting ballasts, PFC stage) or an ESR value, generally, they are not designed for high frequency power supplies.

[bigbeark]

Re: Understanding datasheets without impedance listed.

Yes you have decoded the Ripple and Impedance correctly. Bottom line these caps are crap.
They are NOT low-ESR, low-impedance caps. Maybe OK for a power supply, not for a motherboard

[marcus905]

Re: Understanding datasheets without impedance listed.

I find that the general purpose caps don't have the impedance listed but they do have something called "tan" instead. I've asked before what it means, but no one knew it seemed.

If i'm not mistaken it's "tan delta" and it's the thermal dissipation factor.

[Longbow]

Re: Understanding datasheets without impedance listed.

The TAN column refers to the term 'tan loss' or the tangent of the phase angle between resistive and reactive components of the cap. This figure is a little more informative than a straight ESR reading, but harder to interpret. The lower the number, the lower the resistive loss component. In daily practice, an approximate ESR value will be sufficient. For initial circuit design purposes, the tan loss figure is more precise.