Electronics > Repair
Where can I find information on an old Rifa capacitor to find modern replacemen?
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Aston01:
I am attempting to replace a broken Rifa capacitor but likely due to its age I can't find any documentation on this specific part number (PME 2616 MA 510).

Does anyone know where I can go to find enough information to cross-reference to a modern replacement?
fzabkar:
https://file.elecfans.com/web1/M00/20/FE/ooYBAFmk4f2AOsh6AFozsxcyW-I075.pdf

MP = metallised paper
Capacitor Name - PME2616
Capacitor Type - General Purpose
Replacement Type - PME261E (page 42)
David Hess:
MP is metalized paper.  Any y-class capacitor with the same capacitance and voltage rating may be used.  If it was a line to neutral application, then an x-class capacitor may be used instead.
Gyro:
Congratulation on catching it before the Rifa madness set in - they are metalized paper and notorious for giving off lots of magic smoke and occasionally a small flame when they reach a certain age. The cracking allows moisture ingress, which is the ultimate failure mechanism.

PME2616 capacitors are still available to this day, now under the Kemet brand, which will normally give several decades of continued life.

In most applications, a metalized Polypropylene (MKP) is a suitable replacement. As regards sub-type, the capacitor's position in the circuit is important, so it isn't possible to give an exact recommendation. If the capacitor is being used as an EMC suppression filter in an across-the-mains application, then it is important that a class X type is used, normally an [Edit: X2 X1 to match 630V DC rating], as they have thin metalization and are designed to be self healing on voltage spikes. If, on the other hand, it is being used somewhere inside the equipment, on a DC rail or pulse application, then it is important to not pick an X type because a thicker metalization is needed.
floobydust:
The Rifa's have oddball lead spacing which makes changing to a better brand, a bit of hassle sometimes.
OP you have to know what class, where the cap is- across mains or to GND, used in TRS-80 etc. ;)

PME271 datasheet and PME271M510MR30 edit: not high enough voltage rating is X2 LS=15.2mm but a 15.0mm fits.
It's the LS=20.3mm parts that are a hassle to stuff in a modern 22.5mm part.

I use Epcos, Wurth, Kemet R46 or R47 R474I210050A1K is X1, 440VAC/1kVDC $0.48 etc.  Some Kemet parts have long leads if you need that.
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