About Wima film capacitors

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mdardeniz

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Joined 2020
#1
Hi, How can we distinguish the Wima's FKP2 or MKS2 or MKP2 capacitors. I'm not sure about the 470pf caps. looks like that 5mm cap.,
220pf-100vdc-fkp2-220p-100-wima.jpg
. What about this?
 
#3
Wima capacitors can be distinguished by looking at the color of the box, the color of the resin and the color of the text. For instance MKS02 in 2.5 mm pitch has a red box, silver text and yellow resin. MKS2 in 5 mm has a red box, silver text and red resin. It can be somewhat confusing when older and more recent production lots are concerned. Some series still have tinned copper lead wires while most have plated steel/iron lead wires.
 
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#5
I have some Wima 33nF, 400V capacitors of unknown pedigree. They are in the classic red radial package with 5mm lead spacing, red fill epoxy and black lettering - ??? I'm hoping they are MKP, but given the small size and high voltage rating they may be MKT.
 
#8
wrenchone said:
I have some Wima 33nF, 400V capacitors of unknown pedigree. They are in the classic red radial package with 5mm lead spacing, red fill epoxy and black lettering - ??? I'm hoping they are MKP, but given the small size and high voltage rating they may be MKT.
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I have never seen MKP in a red package. An easy way to test: If you have an LCR meter that measures at 10kHz, the DF will be near-zero for PP, and near .01 for the PET films.
 
#9
Well, duuuh. I had a look at the bag the caps came in - it was an Ebay score of 700 pieces, originally from TAW Electronics. The label on the bag clearly says MKP2 - case closed. Just for due dilligence, here's a photo of the caps in question. I was uncertain of whether they were MKP or MKT due to the small size, but I'll go by the label on the bag. BTW, I see Wima MKP capacitors in red cases all the time.
 

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#10
#11
I have a fair number of RIFA 1uF, 100V radial polycarbonate caps that I commonly use for input coupling on a lot of my amps - they definitely have steel leads. I also have a fair number of 1uF, 50V smallish axial polycarbonate caps from Bishop Electronics (SoCal cap manufacturer acquired by Electrocube). The caps fit in the same PCB outline as the RIFA MKCs, and the leads are copper.
 
#18
mdardeniz said:
Hi, How can we distinguish the Wima's FKP2 or MKS2 or MKP2 capacitors. I'm not sure about the 470pf caps. looks like that 5mm cap., View attachment 1103838 . What about this?
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Those are WIMA's FKP2. MKP/MKS has not pf caps. Those are very bad for HF in signal line. For example, usage in NAP140's 470pf's. I don't know why, FKP must be very good cap in theory. Other PP, Polypropylene caps (Chinese CCB) are really better.
 
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