Guten Morgen, Jurgen, I think you may be trying to compare plastic film capacitors with ceramics. Those codes, P100, NPO, etc, refer to the variability of the capacitance of the ceramic over a temperature range. NPO will not vary, whereas Z5U will be within -20% to +80% of the nominal value over the temperature tange -15 C to +85 C (I think - check me on those numbers). P100 and N150 are very stable, as I recall, as compared to Z5U. There is a code these things follow if you know how to translate them, it's an industry standard. Mylar is polyester. I forget the chemical structure of polyester. Polypropylene capacitors will have low dissipation factors, compared to polyester, but will be bigger for the same capacitance value. There is nothing mysterious about these things once you know the code. Lou Hart
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From: Jurgen Kruger[SMTP:[log in to unmask]]
Sent: Thursday, June 08, 2000 2:59 AM
To: [log in to unmask]
Subject: [TN] Materials for capacitors
<<File: ATT00001.htm>>
Dear Members!
Today I would like to know something more about the materials used to produce capacitors. I'm always in charge of, to design in Germany, but to produce in China. But the descriptions of the materials are not the same. You see, our clients design, build their prototype with material they bought here in Germany, but I have then to fly to China and must find approbiate material in the China market which fits the German capacitors and of course the specs of the circuit diagram.
For example: In Germany we use "KP" or "MKP", synthetic material foil polypropylen, "M" means metalised. Or "KS", "MKS" means synthetic material foil styroflex (polystyrol).
But In China (and in many catalogs) I read something like P100, NPO, N150, N750, K2000, KDPU, Y5P, Z5U, Z5V, D6000, D9000. I think this descriptions have something to do with the temperature coefficent. But I need some more accurate informations about.
So I need some input about the differencies between KP, MKP, MKS, MKT, FKP, ... against Y5P, Z5V, ...
Also, I would like to know, what is "Mylar"? I read it always in Chinese catalogs, but I don't know, what kind of materials is it? I found an information in a data-sheet from Intersil, they wrote "Mylar is a trademark of E. I. Du Pont De Nemours and Company". So I guess, "Mylar" is not an official abbreviation for the used material of the capacitor. What is the real spec of the Mylar cap?
I'm just a technician, so my knowledge is really limited. But I think it's better to buy all components in China, not to buy in Germany and transport it to China. I highly appreciate any input about this issue, for example recommended books, or data-books from manufacturers or their web-site with deeper insight of material referencies.
Sorry for my long e-Mail and thank you very much!
Jurgen Kruger.
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